3rd Year 2nd Sem Questions

98
Ex/CE/T/325/71/2012(S) BACHELOR OF CIVIL ENGINEERING EXAMINATION, 2012 ( 3rd Year, 2nd Semester, Supplementary ) DESIGN OF METAL STRUCTURES - I Time : Three hours Full Marks : 100 ( 50 marks for each part ) Use a separate Answer-Script for each part. PART – I Answer any two questions. IS-800, IS-875 and SP-6 are allowed in the examination hall. Assume any data not given. 1. Design member forces of a rafter member in roof truss are as follows : Compress force (Factored) = 250 kN (DL + LL) Tensile force (Factored) = 200 kN (DL + WL), Design the member using angle section. Nodal length of rafter member is 1·8 m. Assume weld connection. Use limit state method. Connection design is not required. 25 2. a) Determine the maximum load ‘P’ could be resisted by the bracket as shown in Fig. Q.2(a). Size of the fillet weld is 6 mm (shop). 20 [ Turn over 3. a) Design a column with rolled steel I-section to support a factored axial load of 1750 kN. The column has an effective length of 9.0 m with respect to major axis of the cross- section (z-axis) and 7.5 m with respect to minor axis of the cross-section (y-axis). b) Design a suitable base plate for the above mentioned column. The base plate is to rest on a concrete pedestal having the safe bearing capacity of 9.0 MPa. Assume any reasonable data, if required. Draw a neat sketch to show the details of the column with base-plate. 25 [ 4 ]

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Transcript of 3rd Year 2nd Sem Questions

  • Ex/CE/T/325/71/2012(S)

    BACHELOR OF CIVIL ENGINEERING EXAMINATION, 2012

    ( 3rd Year, 2nd Semester, Supplementary )

    DESIGN OF METAL STRUCTURES - I

    Time : Three hours Full Marks : 100

    ( 50 marks for each part )

    Use a separate Answer-Script for each part.

    PART I

    Answer any two questions.

    IS-800, IS-875 and SP-6 are allowed in the examination hall.

    Assume any data not given.

    1. Design member forces of a rafter member in roof truss are as

    follows :

    Compress force (Factored) = 250 kN (DL + LL)

    Tensile force (Factored) = 200 kN (DL + WL),

    Design the member using angle section. Nodal length of rafter

    member is 18 m. Assume weld connection. Use limit state

    method. Connection design is not required. 25

    2. a) Determine the maximum load P could be resisted by the

    bracket as shown in Fig. Q.2(a). Size of the fillet weld is 6

    mm (shop). 20

    [ Turn over

    3. a) Design a column with rolled steel I-section to support a

    factored axial load of 1750 kN. The column has an effective

    length of 9.0 m with respect to major axis of the cross-

    section (z-axis) and 7.5 m with respect to minor axis of the

    cross-section (y-axis).

    b) Design a suitable base plate for the above mentioned column.

    The base plate is to rest on a concrete pedestal having the

    safe bearing capacity of 9.0 MPa. Assume any reasonable

    data, if required. Draw a neat sketch to show the details of

    the column with base-plate. 25

    [ 4 ]

  • [ 2 ] [ 3 ]

    b) Explain the advantages of star arrangement using two ISA

    member. 5

    3. A 15m 60m factory shed is to be constructed at Howrah. The

    steel roof trusses are to be used for roofing. The spacing of roof

    truss is 4 m and span of the truss is 15 m. Steel column height

    above GL is 70 m. Galvanised corrugated iron sheets will be

    used. Maximum spacing of purlins = 18 m. Propose a suitable

    type of roof truss and calculate the wind load only at the modal

    points. 25

    PART II

    [ Use of IS-800 and SP-6(1) are allowed in the examination hall. ]

    ( Consider Fe410 steel i.e. yield stress of steel = 250 MPa )

    Answer any two.

    4. A steel floor beam is simply supported over a span of 6.0 m. It is

    subjected to uniformly distributed load of intensity 40 kN/m

    (D.L.+L.L.) acting over its entire length and a concentrated load

    of magnitude 120 kN acting at its mid-span. Design a rolled steel

    I-section for this beam if the compression flange of the beam is

    not laterally restrained/supported along its length. Show all

    checks. Assume any reasonable data, if required. 25

    5. Design a rolled steel channel section, under dead load and wind

    load (thrust) combination, for a purlin member in an industrial

    shed having the following data :

    Spacing of truss = 4.5 m c/c

    Span of truss = 18.0 m

    Spacing of purlins = 1.4 m c/c

    Angle of truss = 22o

    Net intensity of wind pressure = 1.75 KN/m

    Weight of galvanized sheet = 160 N/m2

    Assume any reasonable data, if required. 25

    Fig. Q.2(a)

    [ Turn over

  • Ex/CE/T/325/71/2011

    BACHELOR OF CIVIL ENGINEERING EXAMINATION, 2011( 3rd Year, 2nd Semester )

    DESIGN OF METAL STRUCTURES - I

    Time : Three Hours Full Marks - 100

    Use a separate Answer-Script for each Part

    (50 marks for each part)

    PART - I

    Answer any two questions

    I.S. - 800, I.S. - 875 and SP - 6are allowed in the examination hall.

    Assume any data not given

    1. a) Calculate the sine of the weld required for the joint cuttingused as a bracket loaded as shown in Fig.Q.1.

    [ Turn over

    Spacing of purlins = 1.35 m c/cAngle of truss = 20o

    Net intensity of wind pressure = 1.5 KN/mWeight of galvanized sheet = 160 N/m2.

    6. Verify the adequecy of a column section made of ISHB 300 @58.8 kg/m and of effective length 2.8 m under the factored axialcompressive load of 500 KN and a factored moment of 60 kNmabout its major axis for local capacity and buckling resistance ofmember. 25

    7. Design a suitable welded gusset base for a column section IS.H.B.350 @ 67.4 N/m supporting a factored axial load of 1450 KN.The flanges of the column are parallel to the gusset plate. The

    base plate is to rest on a concrete pedestal having the safe bearingpressure of 9.0 MPa. 25

    - 4 -

    Fig.Q.1

  • - 2 - - 3 -

    b) What are the advantages of HSFG bolts over black bolts?c) When are bending moments to be considered in the design

    of top chord of trusses? 20+3+2=25

    2. Design member forces (factored) of a rafter member in a rooftruss are as follows :

    Compressive force = 100 KN (DL + LL)Tensile force = 150 KN (DL + LL)

    Design the member using angle section or tubular section. Assumewelded connection. Nodal length of rafter member is 1.5 m. Uselimit state method of Design. 25

    3. A 12 m 40 m godown is to be constructed. The steel roof trusseswill be used for roofing. Spacing of the truss is 4 m and span ofthe truss is 12m. Pitch of the roof truss = D. Column heightabove ground level is 6m. Galvanised corrugated iron sheets willbe used. Maximum spacing of purlins = 1.5 m. Location of thegodown = Durgapur. Propose a suitable type of roof truss andcalculate the wind load only at panel points. 25

    PART - II

    Answer any two questions

    [ Use of I.S. 800 and SP - 6 (1)are allowed in the examination hall. ]

    ( Consider Fe 410 Steel i.e. 'yield stress' of steel = 250 MPa )

    4. An ISLB 600 @ 99.5 kg/m has been used as a simply supportedbeam over 7.2 m span. The compression flange of the beam isnot laterally supported but the ends of the beam are fully restrained against torsion and lateral bending. Determine the safeuniformly distributed load (including its self weight) that thebeam can carry in flexure. Also check whether the beam sectionis safe or not in shear, deflection and others if this maximum loadis applied on it. 25

    5. a) Determine the plastic modulus of ISMC 125 @ 12.7 kg/mabout the strong and weak axes. 8+17=25

    b) Check whether the above section is safe or not under'dead load and wind load (thrust)' combination if it is usedaqs a purlin member in an industrial shed having the followingdata :Spacing of truss = 4.5 m c/cSpan of truss = 20.0 m

    [ Turn over

  • Ex/CE/T/325/71/2012

    BACHELOR OF ENGINEERING IN CIVIL ENGINEERINGEXAMINATION, 2012

    ( 3rd Year, 2nd Semester )

    DESIGN OF METAL STRUCTURES - ITime : Three hours Full Marks : 100

    (50 marks for each part)

    Use a separate Answer-Script for each part.

    PART I

    Answer any two questions.

    IS-800, IS-875 and SP-6 are allowed in the examination hall.

    Assume any data not given.

    1. a) A 12 m 50 m godown is to be constructed at Ranchi. The

    steel roof trusses are to be used for roofing. The spacing of

    the roof truss is 5 m and span of the truss is 12 m. Column

    (steel) height above ground level is 7.0 m. Galvanised

    corrugated iron sheets will be used. Maximum spacing of

    purlins = 1.75 m. Propose a suitable type of roof truss and

    calculated the wind load only at panel points. Assume pitch

    of the roof truss is 4 m. 20

    b) When are bending moments to be considered in the design

    of top chord of trusses? How the spacing of the purlins

    fixed? 5

    2. a) Design member forces (factored) of a rafter member in a

    roof truss are as follows :

    Compressive force = 200 KN (DL + LL)

    Tensile force = 150 KN (DL + WL)

    [ Turn over

    6. a) Design a column with rolled steel I-section to support a

    factored load of 1500 kN. The column has an effective

    length of 8.0m with respect to major axis of the cross-

    section (z-axis) and 5.5m with respect to minor axis of the

    cross-section (y-axis). 25

    b) Design a suitable base plate for the above mentioned column.

    The base plate is to rest on a concrete pedestal having the

    safe bearing capacity of 9.0MPa. Assume any reasonable

    data, if required. Draw a neat sketch to show the details of

    the column with base-plate. 25

    [ 4 ]

  • [ 2 ] [ 3 ]

    Design the member using angle section. Assume welded

    connection. Nodal length of rafter member is 1.7 m. Use

    limit state method of design. 22

    b) What is the major difference in behaviour between a joint

    with black bolts and a joint with HSFG bolts? 3

    3. a) Determine the maximum load that could be resisted by the

    bracket as shown in Fig. Q.3(a). Size of fillet weld is 6 mm

    (shop). 20

    Fig Q.3(a)

    b) Draw neatly the end connection between a truss and column

    (weld or bolt). Assume column size ISMB 500. Size of

    relevant truss member is double angle 75758. Other data

    may be assumed. 5

    PART II

    [Use of I.S. 800 and SP-6(1) are allowed in the examination hall.]

    (Consider Fe410 steel i.e. yield stress of steel = 250MPa)

    Answer any two questions.

    4. A steel floor beam is simply supported over a span of 5.5m. It is

    subjected to uniformly distributed load of intensity 32kN/m

    (D.L.+L.L.) acting over its entire length and two concentrated

    loads of magnitude 60kN (D.L.+L.L.) each acting at a distance

    2m from either end of the beam. Design a rolled steel I-section

    for this beam if the compression flange of the beam is not

    literally restrained / supported along its length. Show all checks.

    Assume any reasonable data, if required. 25

    5. Design a rolled steel channel section, under dead load and wind

    load (suction) combination, for a purlin member in an industrial

    shed having the following data : 25

    Spacing of truss = 4.0 m c/c

    Span of truss = 17.0 m

    Spacing of purlins = 1.45 m c/c

    Angle of truss = 21o

    Net intensity of wind pressure = 1.6 kN/m

    Weight of galvanized sheet = 150 N/m2.

    Also check whether the section is safe under dead load and

    wind load (thrust) combination.

    Assume any reasonable data, if required. 25

  • Ex/CE/T/325/61/2009

    BACHELOR OF CIVIL ENGG. EXAMINATION, 2009(3rd Year, 2nd Semester)

    DESIGN OF METAL STRUCTURESI

    Time : Three hours Full Marks : 100(50 marks for each part)

    Use a separate Answer-Script for each part.

    PART I

    Answer any two questions.

    1. A simply supported beam of span 8m carries a load of300 kN at the mid span. Design and detail the beam ifthe heaviest section available locally is ISMB 500.

    25

    2. Design and detail a compound column of effective length8 m and carrying a load of 1800 kN. Design the lacingor batten system to properly brace the compoundcolumn. 25

    3. Explain the following termsplastic neutral axis, shapefactor, load factor Calculate the shape factor of achannel of overall depth 250 mm and flange width 80mm. Take thickness of all elements as 8 mm. Calculatethe ultimate load of the beam shown below.

    3x4+6+7=25

    [ TURN OVER ]

  • PARTII

    Answer any two questions.

    I.S. 800, 875 and SP-6 are allowed in the examinationhall.

    Draw neat sketches wherever necessary. Assumereasonable values of any data not given.

    4. Roof trusses for a factory shed located at Kolkata.(Fig Q. 4) are spaced 4.5 m apart. Size of the shed is18m x 45m. Height of the eaves level is 5m aboveground level. Design the purlin using angle section.

    25

    5. The design member force of a member marked A is asfollows (see fig Q.5):

    compressive force = 90 kN (DL+ WL)

    Tensile force = 90 kN (DL + LL)

    Design the member using angle section also design theweld connection of the member at the node. Detail theconnection assuming other members are ISA 80x80x6 atthe node. 25

    6. (a) Fig Q.6 (a) shows a bracket subjected to a load of100kN. The bracket is welded to a flange of an ISMB.Find out the size of weld. 18

    (b) Why the longitudinal ties are provided in designing thebottom chord members of a typical roof truss? 3

    (c) Why tack welding / tacking rivets are provided in acompression member made up of 2 nos angle sections?

    4

    Fig - 1

    ( 2) ( 3 )

    Fig- Q. 4

    Fig- Q. 6 (a)

  • EX/CE/T/325/74/2010

    BACHELOR OF CIVIL ENGG. EXAMINATION, 2010

    (3rd Year, 2nd Semester)

    DESIGN OF METAL STRUCTURES I

    Time : Three hours Full Marks :100

    (50 marks for each part)

    Use a separate Answer Script for each part.PART I

    Answer any two questions.I.S. 800 1984 and 2007, SP 6are allowed in examination Hall.

    Assume any data not given suitably.

    1. Determine the tensile and compressive strength of adiagonal member of a typical roof truss (L 100 x 100 x 8)connected to a gusset plate of thickness 10mm as per limitstate method of design (IS 800 2007). Assume 4mmweld size and the proportionate lengths of weld are 200 mmand 350 mm. Nodal length of the member is 3.0m (fy = 250MPa).

    Aslo calculate the tensile and compressive strength of thesame member of the roof truss as per IS 8001984. 25

    2. a) A bracket plate is welded to the flange of a column as shownin Fig Q.2. Calculate the size of the weld. 16

    [ TURN OVER ]

    7. a) Design a column of length 5.2m to carry a compressive loadof 650KN at an eccentricity of 125mm from the x-x axis. Theends of the column are hinged.

    b) Design a suitable slab base for a coulmn section I.S.H.B.250@547N/m supporting an axial load of 480KN. The baseplate is to rest on a concrete pedestal having the safebearing pressure of 4.0MPa. Also design the dimension ofconcrete base if the safe bearing capacity of soil is 250KN/m2. 15+10=25

    (4)

    x

  • (2) (3)

    b) How the spacing of purlins are fixed? 3

    c) Discuss the behaviour of rafter members of a typical trusswhen purlins are not provided at each node. 3

    d) Why are CHS/SHS better in resisting compression forces?3

    3. a) Design member forces (unfactored) of a rafter member areas follows :

    Compressive force = 100 KN (DL + LL)

    Tensile force = 100 KN (DL + WL)

    Design the member using angle section using IS8001984or IS8002007. Assume welded connection.

    b) Why is it better to choose plastic or compact sections forcolumns? 22+3

    PART II

    [Use of I.S.800 and SP6 (1)

    are allowed in the examination Hall.

    Consider yield stress of steel forall qauestions = 250MPa]

    Answer any two questions

    4. a) What is the difference between web buckling and webcrippling of steel beams? How they can be avoided?

    b) A steel floor beam in a building has an effective span of4.2m. It is simply supported over supports and carries auniformly distributed load of 32KN/m inclusive of self weightand a concentrated load of 40KN at the centre. Design thebeam section and show all relevant checks. Assume thatthe compression flange is not restrained laterally but theends of the beam are fully restrained against torsion andlateral bending. 5+20=25

    5. A simply supported beam over an effective span of 8.5m issubjected to uniformly distributed superimposed load of24KN/m acting along the entire span. The depth of beam islimited to 375mm from clear head-room requirements.Design a rolled steel ISMB section with suitable cover plates.Design of connections and curtailment of cover plates arenot required. 25

    6. Design a built-up column of effective length 6.5m with twochannel sections laced together to support a concentricaxial load of 1050KN. Also design the lacing members withriveted connection. 25

  • Ex/CE/T/325/71/2011(S)

    BACHELOR OF CIVIL ENGG. EXAMINATION, 2011

    (3rd Year, 2nd Semester, Supplementary)

    Design of Metal Structures- I

    Time : Three hours Full Marks : 100

    Use a Separate Answer-Script for each part.

    PART I

    (50 marks)

    Answer any two questions.

    I.S:800, IS:875 and SP-6 are allowed in the examination hall.

    Assume any data not given.

    1. Design member force (factored) of a rafter member are

    as follow.

    Compressive force = 180 KN. (DL + LL)

    Tensile force = 220 KN (DL + WL)

    Design the member using angle section. Assume welded

    connection. Nodal length of the rafter is 1.7m. Use limitstate Method of design. Connection design is to beshown. 25

    2. a) Why are CHS/ SHS better in resisting compressionforces? 4

    b) How the behaviour of rafter members change when

    purlins are not provided at each joint? 4[ Turn Over ]

    x

    6. A column made of ISHB 450@ 92.5 kg/m is hinged at boththe ends. Its effective length is 4.0m. It is subjected tofactored axial compressive load of 1200 KN and a

    factored moment of 240 kN/m about its major axis at boththe ends. Check whether the column section is safe ornot. 25

    7. Design a suitable riveted gusset base for a columnsection I.S.H.B.400@ 82.2 kg/m supporting a factored

    axial load of 1300KN. The flanges of the column areparallel to the gusset plate. The base plate is to rest ona concrete pedestal having the safe bearing pressure of

    8.5 MPa. 25

    ( 4 )

  • ( 2 ) ( 3 )

    [ Turn Over ]

    c) What are the advantages of HSFG bolts over black bolts?4

    d) How are the spacing of purlins fixed? 4

    e) What are the advantages of providing longitudinal tiesat the bottom chord? 4

    f) Draw a typical end support connection of truss withcolumn. Assume welded connection. For column andAngles truss member assume suitable sections. 5

    3. a) What is taking rivet? 3

    b) A bracket plate is welded to the flange of a ISMB 250 as

    shown in fig 3(b). Calculate the weld size required tosupport a factored load of 100 KN. 22

    PART II

    (50 marks)

    [Use of I.S.800 and SP-6 (1) are allowedin the examination hall.]

    (consider Fe410 steel i.e. yield stress

    of steel = 250 MPa)

    Answer any two questions.

    4. A steel floor beam is simply supported over a span of6.5m. It is subjected to uniformly distributed load of

    intensity 40 kN/m (D.L + L.L.) acting over its entire lengthand a concentrated load of magnitude 160kN acting atits mid-span. Design an I-section for this beam if the

    compression flange of the beam is not laterally supportedalong its length. 25

    5. Design a channel section, under dead load and windload (thrust) combination, for a purlin member in an

    industrial shed having the following data : 25

    Spacing of truss = 4.2 m c/c

    Span of truss = 18.0 m

    Spacing of purlins = 1.4 m c/c

    Angle of truss = 220

    Net intensity of wind pressure = 1.75 KN/m

    Weight of galvanized sheet = 160 N/m2.

  • Ex/CE/T/323/70/2012(S)

    BACHELOR OF CIVIL ENGINEERING EXAMINATION, 2012

    ( 3rd Year, 2nd Semester, Supplementary )

    SOIL MECHANICS - II

    Time : Three hours Full Marks : 100

    ( 50 marks for each part )

    Use a separate Answer-Script for each part.

    PART I

    Answer any three questions. Two marks for neatness.

    1. a) Discuss different approaches for determination of depth of

    a bore hole in soil exploration works.

    b) A 12-storied office building with a basement floor 32m

    below ground surface is to be built in an area of 60m30m.

    The D.L per floor is 540 kg/m2 and L.L. 450 kg/m2. The

    column grid is 5m5m. If the average soil unit wt. is 182

    t/m3 and ground water table is 40m below EGL. Determine

    the maximum depth of bore hole and least number of bore

    hole. 8+8=16

    2. a) Distinguish between consolidation and competition.

    b) The results of a laboratory proctor tests on a soil sample are

    as follows.

    water content % 83 104 122 162 180 204wt. of wet soil (gms) 1636 1821 1907 2016 2034 1992

    [ Turn over

    7. a) Discuss the various modes of failure in finite slopes. 5

    b) A 15 m high earthen dam is to be constructed with a slope of

    1.5H : 1V. The properties of dam soil are given by :

    g = 20 t/m3

    Cohesion = 70 t/m2

    f = 18o

    Determine the factor of safety of a typical slip circle passing

    through the toe of the dam. 10

    [ 4 ]

  • [ 2 ] [ 3 ]

    [ Turn over

    i) Plot compaction curves and find OMC and maximum

    dry density.

    ii) Plot also zero air void and 15% air void curve. Assume

    G = 270. 12+4=16

    3. a) Determine the safe load that can be carried by a square

    footings of 25m25m size placed 15m below G.L. The

    foundation soil has the following properties.

    3170 t/mg = , 2c 11 t/m= , 20f =

    For 20f = c q r

    c q r

    N 177, N 74, N 50

    N 118, N 38, N 13

    = = = = = =

    Assume F.O.S = 25

    b) Discuss the theory of Terzaghis theory and Mayerhoffs

    bearing capacity. 10+6=16

    4. a) What are local, general and punching shear failure of soil?

    Show Load settlement curve for each type.

    b) What are the factors that affect the soil disturbance? How

    are these effects minimised?

    c) Explain the term OMC. How does it lead to maximum dry

    density with a given compactive effort? 6+6+4=16

    PART II

    Answer all questions.

    5. a) What are shear strength parameters? Discuss the factors

    affecting magnitude of shear strength parameters. 2+3=5

    b) Draw typical stress-strain diagram for N. C. and O. C. clay

    as obtained from UU triaxial test. 2

    c) Discuss the types of failure in soft and shift clay in triaxial

    tests. 3

    d) Two identical specimens of soils were tested in a shear box

    and following results were found : 10

    Normal load (N) 500 900Shear load (N) 2100 2670

    6. a) Draw the Mohr circle for Active earth pressure condition

    and also give the expressure for the active earth pressure for

    a c-f soil. 5

    b) A rough vertical wall 6.0 m high supports a cohesionless

    backfill with horizontal surface.

    The properties of backfill soil are given below :

    g = 19 t/m3

    f = 34o

    d (angle of wall-soil interface) = 18o

    Determine the active earth pressure acting on the wall.

    10

  • Ex/CE/T/323/70/2011

    BACHELOR OF CIVIL ENGINEERING EXAMINATION, 2011( 3rd Year, 2nd Semester )SOIL MECHANICS - II

    Time : Three Hours Full Marks - 100

    Use a separate Answer-Script for each Part

    (50 marks for each part)

    Part - I

    Answer Q. No.1

    and any Two from the rest

    1. Attempt any six questions : 6x3=18

    a) A Retaining Wall retains a Sand Backfill with f = 1.8 t/m3and = 30o. If a uniform surcharge of 12 t/m2 is appliedon the top of backfill, find out the increase in ActivePressure.

    b) Prove that for cohesionless soil, the ratio of shear stressto normal stress at failure is maximum at the plane of

    maximum obliguity.

    c) Comment whether the shear strength of a soil is a uniquefunction of total stress or not. Give reasons for yourcomment.

    [ Turn over

  • - 2 -

    d) Show that the co-efficient of Earth pressure for -soil inActive State is less than that for at rest condition.

    e) In a Direct Shear test, Mohrs circle of stress cannot bedrawn for any Intermediate stage of test. Comment.

    f) Explain why in c soil, the slope angle can be madesteaper than the angle of shearing resistance of soil.

    g) What is consolidated undrained test in a Triaxial Sheartest? In what situation this test is adopted?

    h) What is the effect of cohesion on Active and Passivepressure of soil?

    2. a) Compare the Ramkine's theory of Earth pressure withCoulomb's theory in respect of

    i) State of soil massii) Rupture surfaceiii) Geometry and characteristics of Backfill.

    b) A smooth vertical wall 7.0 m high supports a cohesivebackfill with horizontal surface having the properties givenbelow : 6+10=16i) Top 3.0 m depth : C = 1.10 tm2

    = 20o Sat = 1.8 t/m

    3

    - 5 -

    b) The results of a laboratory proctor test are as follow :

    Water content % 8.33 10.40 12.23

    Wt. of Wet Soil (gm) 1636 1821 1907

    Water content % 16.20 17.92 20.39

    Wt. of Wet Soil (gm) 2016 2034 1992

    i) Plot the water contents vs dry density curve anddetermine O.M.C. and maximums dry density.

    ii) Plot also zero air void and 10% air void curve.Assume G = 2.68. 4+12=16

    7. a) Discuss the theory of Terzaghi's bearing capacity andMayeshof's bearing capacity.

    b) Determine the safe load that can be carried by a squarefooting of 2.2 m x 2.2 m size placed at a depth of 1.6 mbelow G.L. The foundation soil has the followingproperties

    = 1.65 t/m3, c = 1.1 t/m2, = 20oFor = 20o (N

    c = 17.7, Nq = 7.4, Nr = 5.0, N c

    1 11 8= . ,

    NQ1 3 8= . , NR

    1 1 3= . )

    Assume F.O.S. = 2.5 6+10=16

  • e) Two specimen of soils were tested in a Shear Box withthe following results :

    Normal Load (kg) 54 90Shear Load (kg) 216 270

    Find out the apparent cohsion and angle of shearingresistance of soil. Also find out the failure plane anddirection of Principal planes. 4+4+8=16

    Part - II

    Attempt All. Two marks for neatness

    5. a) Discuss different approaches for determination of depthof a box hole in soil exploration works.

    b) A 12-storied office building with a basement floor3.0 m below ground surface is to be built in an area of60 m x 30 m. The D. L. per floor is 540 kg/m2 and L.L.450 kg/m2. Thecolumn grid is 5 m x 5 m. If the averagesoil unit wt is 1.80 T/m3 and ground water table is 4.0 mbelow E.G.L. Determine the maximum depth of bore holeand minimum no. of bore hole. 8+8=16

    6. a) Discuss the Factors which control the soil compaction atthe field.

    - 4 - - 3 -

    i) Bottom 4.0 m depth : C = 2.0 t/m2 = 20o

    Sat = 2.0 t/m3

    The free water level stands behind the wall at a depth of3.0 m from top.

    Draw the Active Pressure Diagram.

    3. a) What is the difference between failure surfaces in Finiteand Infinite slops? Find out the critical depth for cohesivesoils for an infinite slope where the slope will be stable.

    b) A Canal Bank is made of soil having Cu = 3.0 t/m2,u = 12o and = 2.0 t/m3. The height of the slope is10 m with a slope of 1.5 (H) : 1.0 (V). Find out the factorof safety by using a trial slip surface passing through thetoe of the slope. 6+10=16

    4. a) For a cohessionless soil using Mohr-coulomb failure,prove that the plane of maximum obliguity is the criteriongoverning failure and not the maximum shear stress plane.

    b) State the discrepencies in Direct Shear Test.

    [ Turn over

  • Ex/CE/T/323/73/2010

    BACHELOR OF CIVIL ENGG. EXAMINATION, 2010

    (3rd Year, 2nd Semester)

    SOIL MECHANICS - II

    Time : Three hours Full Marks : 100(50 marks for each part)

    Use a separate Answer - Script for each part.

    PART I

    Answer question no.1 and any two from the rest.

    1. Answer any six of the followings : 3x6

    a) Does the Mohr circle of stress is a function of Soil Type?

    How the failure of soil is adjudged under shearstress?

    b) Explain the conditions of at rest pressure and activepressure from Mohr Coulombs failure theory.

    c) Under what conditions toe failure and base failure occurin a slope of homogenous soil.

    d) What type of test you will advocate for finding out theeffective shear strength parameters for a separated N.C

    clay and why ? Indicate the parameters using Mohrscircle of Stresses.

    e) The direction of Principal planes is different in Box sheartest than that in Triaxial test Justify.

    f) In clay show that the inclination of a stable slope can be[ Turn Over ]

  • ( 2 )

    made more than the angle of shearing resistance of soil.

    g) Why does a tension crack develope in a cut for cohesiresoil ? What is the depth of tension crack ?

    h) In stability analysis by method of slices, for each andevery slice, WS ind is the force trying to cause failure

    Justify the statement with reason whether it is true orfalse.

    2. a) Find out the relation between the shear strengthparameters and the principal stresses at failure. 6

    b) The angle of shearing resistance in terms of total

    stresses for a saturated clay as obtained from UU test isZero. Does this mean that the strength of clay cannot beattributed to friction ? 4

    c) For a Cohesionless soil the principal stresses at failure

    are 600 KN / m2 and 200 KN / m2. Determine the planesof maximum shear and maximum obliquity and thestresses acting on them. 6

    3. a) What is the difference between Rankines and Coulombs

    theory of earth pressure in respect of Backfill andcondition of wall. How can you identify whether Rankineor Coulombs theory is to be adopted for earth

    pressure ?

    b) A cantilever sheet pile is used for excavation ofcohesionless soil having g = 1.8 t / m3, f = 30. The sheetpile is driven upto a depth of 9.0 m and the depth of

    placed 1.2 m below E.G.L having the following

    Engineering Properties, g = 1.90 T/ m3, C = 2.3 t / m2,a = 20 (Nc= 14.8, Nq= 6.4, Nr= 3.5). Determine theminimum size of footing to have a F.O.S of 2.5 against

    shear failure use any theory. 6+16=16

    9. a) Discuss how the depth boring is fixed ?

    b) Prove that energy recieved in Modified Procter is about4.5 times that of ordinary Procter.

    c) Discuss the effect of water table on bearing Capacity Soil.6+4+6=16

    ( 5 )

  • where there is a change in the formation.

    Distance of Peg

    from Geophone (m) 10.5 15.0 20.0 30.0 400.0 500.0 600.0

    Time taken by thefirst wave front to

    reach Geophone (ms) 16.5 25 33 50 225 250 275

    b) Discuss why split spoon sampler is not used for collection

    of U / S. 12+4=16

    7. a) Discuss the difference between compaction andconsolidation.

    b) The following are the results of a standard Pooctorcompaction test on a soil sample.

    Water content op 13.9 16.3 18.8 19.4 22.8 23.4 26.6Wt. of wet soilin(Kg) 1.663 1.720 1.779 1.851 1.893 1.898 1.885

    Plot Pooctor compaction curve and hence find the valueof OMC & dry density. Calculate the water contentnecessary to completely saturated the sample. Draw

    100% & 90% saturation curve also. 4+12=16

    8. a) Discuss the factors which affects the bearing capacitysoil. What do you mean by the term bearing capacity &

    bearing pressure.

    b) A coloumn of building carrying a vertical load of 40.0 Thas to be supported by a square footing. The footing is

    ( 4 )

    excavation is 4.0 m. Draw the earth pressure diagram and

    find out the resultant earth pressure. 8+8=16

    4. a) Explain Coulombs theory of earth pressure and indicatehow you can find out active earth pressure.

    b) A Retaining wall 8 m high has its back sloping at an angleof 75 with the horizontal. The surface of the backfillslopes at an angle of 15 to the horizontal. Properties ofbackfill are as follows :g = 1.85 t / m3, C = 0, f = 35, d = 25. Determine theResultant Active thrust by Culmans method ofconstruction. 6+10=16

    5. An embankment made of uniform soil with C = 30 KN /

    m2, f = 15 is 8 m high with a slope angle of 34 with thehorizontal. Find out the factor of safety against failurealong a trial slip circle passing through the toe of the

    slope. 16

    PART II

    Answer any three questions. Two marks for neatness.

    6. a) The following data were collected from a Seismic refraction

    test in an area. Determine the depth from the ground level

    ( 3 )

  • Ex/CE/T/323/70/2011(S)

    BACHELOR OF CIVIL ENGG. EXAMINATION, 2011(3rd Year, 2nd Semester, Supplementary)

    Soil Mechanics II

    Time : Three hours Full Marks : 100

    Use a Separate answer-Script for each part.

    PART I

    Answer Q.1 and any two from the rests.

    1. a) Mention different types of triaxial tests Discuss thecircumtances when these tests are conducted fordetermination of shear strength parameters.

    Draw the Mohrs envelope for UV tests on a clayey soil

    above ground water table and below ground water table.2+5+3 = 10

    b) Two specimen of same soil were tested in a shear boxwith the following results.

    Normal load (kg) 45 75

    Shear load (kg) 175 230

    Find out the shear strength parameters of the soil. Also

    find out the failure plane and direction of principal planes.8

    2. a) What are probable types of failure of a slope? Underwhat conditions these types of failures occur. 6

    [ Turn Over ]

    x

    ( 4 )

    10. The following observations were noted during a proctorcompaction test on a soil sample as per I.S.Codes

    Water Content% 9.6 11.0 12.5 14.0 16.0 18.0 19.5

    Wet density gm/cc 1.8 1.9 1.96 2.05 2.1 2.05 2.01

    Find out dry density and OMC of the sample. Draw 90%saturation curve. 10

    11. a) Discuss the factors on which the depth of bore holesdepends on.

    b) Find out the thickness of a open drive samples of Internaldiameter (ID) 100mm to obtain a good quality of U.D.Sin a soft N.C. clay. 6+4 = 10

  • PART II (50 marks)

    Attempt any five Questions.

    Illustrate your answer with neat sketches.

    5. Discuss standard penetration test. What are the variouscorrections? What is the importance of test in

    geotechnical engineering? 5+3+2 = 10

    6. How would you find out degree of compaction at field. Onwhat factors degree of compaction is depends on.

    7+3 = 10

    7. a) Discuss Terzaghis bearing capacity theory. How does itdiffer from Mayerhoffs theroy.

    b) Discuss the effect of water table on bearing capacity.5+5 = 10

    8. What is the effect of compaction on the engineeringproperties of the soil? How would you decide weather thesoil should be compacted dry of optimum or wet of

    optimum. 5+5 = 10

    9. A column of a building carrying a vertical load of 40.00tor has to be supported by a square footing. The footingis placed 1.2m below G.L in a homogenous bed of soil

    having the following properties : - 10

    3 0 21.80T/m, 2 0 , C 1.5t /mg f= = , Water table 1.5m

    below G.L. Determine the size of footing with F.O.S of 2.5use any theory. Given that

    020 (Ne 14.3, Nq 6.5 Nr 3.5)f = = = = 10

    b) An embankment 10m high is to be made with a c-f soilhaving r = 1.85 t/m3, c = 4 t/m2, f = 150. The slope ofthe embankment is 1.5 (M): 1 (V). Foundation soil is

    uniform and have r = 1.9 t/m3, c = 8t/m2, f = 00

    Determine the factor of safety for a typical slip circlepassing through the toe of the embankment. 10

    3. a) Derive the expressions for active and passive earthpressures. 8

    b) Draw the active earth pressure diagram for a retaining

    wall of height 8.0m for a plane and horizontal backfill oflayers as given below:

    Layer I : Thickness 3.0m, g = 2t/m3, C = 0, f = 350

    (Sand)

    Layer II : Thickness 5.0m, g = 1.9t/m3, C = 3.5t/m2, (clay) f = 180

    4. a) How do you estimate depth of vertical cut in cohesive soilwithout any lateral support?

    b) Discuss the factors affecting shear strength parametersof a soil?

    c) Find out the critical depth for cohesive soils for an infinite

    slope.

    d) State the discripancies in Direct shear test. 4x4 = 16

    ( 2 ) ( 3 )

    [ Turn Over ]

  • Ex/CE/T/323/60/2009

    BACHELOR OF CIVIL ENGG. EXAMINATION, 2009

    (3rd Year, 2nd Semester)

    SOIL MECHANICS II

    Time : Three hours Full Marks : 100(50 marks for each part)

    Use a separate Answer-Script for each part.

    PART I

    Attempt Q. No. 1 and any two from the rest

    1. Answer any six of the followings : 3x6=18

    a) Explain what do you mean by Shear failure of soil. Does the Mohr Circle of Stress is a function of Soil Type?

    b) Indicate the probable causes of failure of Slope.

    c) For cohrionless soil show that at the Plane of obliquity theratio of Shear Stress and Normal stress is maximam.

    d) How do you estimate the coefficient of Earth pressure at

    Rest Condition?

    e) Estimate the depth of vertical cut in cohsire soil withoutany Lateral Support.

    f) In clay show that the niclimation of a Stable slope canbe more than the angle of Shearing Resistance of soil.

    g) The direction of Principle Planes is different in Box

    Shear test than that of Triaxial shear test. Justify.

    h) For a sand backfill with f=30, indicate the Passive Earthpressure magnitude in terms of Active Pressure magnitude.

    [ TURN OVER ]

  • ( 2 )

    2. a) Mention different types of Triaxial Shear tests. Under what circumstances one is preferred over the offer? Give the Mohrs envelope for a test on a partially Saturnted Cohesive soil.

    b) In a Triaxial Shear Test on a soil sample, the confiringpressure was 2.5kg/cm2 and failure occured at a deviatorstress of 3.5kg/cm2. If the failure plane makes an angle

    of 52 with the horizontal find out the Shear strengthparameters of the soil and Normal & Shear stress onfailure plane.

    8+8=16

    3. a) State the Plastic Equilibrium of soil mass and find out

    Rankines Active and Passive pressure with plasticequilibrium Concept.

    b) Draw the active pressure distribution diagram andCalculate the Resultant Active Pressure for a Retaining

    wall of height 10.0m for a plane and horizontal Backfillof layers as given below :Layer I : Thicknass 3.0m, g =2t/m3, C =0, f =35Layer II : Thicknass 4.0m, g =1.8t/m3, C =2t/m2, f =18Layer III : Thicknass 3.0m, g =1.85t/m3, C =3.5t/m2, f =0

    16

    4. a) What are the probable types of failure of a slope and

    under what conditions these type of failures occur.

    b) An Embarkment 10m deep is to be made with a C - fsoil having C =4t/m2, f=18 & g=1.85t/m3. The slope of

    ( 5 )

    10. a) Discuss the effect of compaction on the engineering

    properties of the soil? How would you decide wheatherthe soil should be compacted dry of optimum or wet ofoptimum.

    b) Prove that energy relieved in Modified Protor is about 4.5times that of ordinary Proctor.

    8+4=12

    11. The following results were obtained from standardproctors compaction test on a soil sample.

    Water Content in %

    Weight of Wet Samplein Kg

    12 14 16 18 20 22

    1.68 1.85 1.91 1.871.87 1.85

    Plot the Compaction Curve and obtain the maximum dry density @ OMC. Draw also zero air void curve. Find also the degree of compaction at Proctors density. Assume data not supplied. 12

  • ( 4 ) ( 3 )

    the embarkment is 1.5(Horizontal) : 1(Vertical).Determine the factor of safety for any failure planepassing through the toe of the embarkment.

    4+12=16

    5. a) What are the conditions of Applicability of Rankinestheory of Earth pressure over Coulombs theory.

    b) A Retaining wall 12m high has its back sloping at anangle of 75 with the horizontal. The Surface of thebackfill slops at an angle of 15 to the horizontal.Properties of Backfill are as follows :g =1.85t/m3, C =0, f =35, d =25 . Determine theResultent Active thrust by Culmans method ofconstruction. 16

    PARTII

    Answer any four Questions. Two marks for neatness.

    6. a) Discuss General, Local and Punching shear failures of

    soil. Show Load settlement curves for each type.

    b) The allowable bearing capacity of purely cohesive soil

    (with a F.O.S. of 3.0) is approximately equal to its un-confined compressive strength. Justify this statement inthe light of any theory. 6+6=12

    [ TURN OVER ]

    7. A column of a building carrying a net Vertical Load of125T has to be supported by a square footing. Thefooting is placed 1.5m below E.G.L. in a homogenousbed of soil having the following Engineering properties :g =1.90T/m3, f =30 [f =30, N

    c=37.2, N

    q=22.5, N

    r =19.7]

    Determine the minimum size of booting to have a F.O.Sof 2.5 against Shear failure, use any theory. 12

    8. a) Discuss the design Features affecting the sampledisturbance.

    b) Discuss why split spoon sampler is not used forcollection of U/S.

    8+4=12

    9. a) During an exploration to locate the ground water table ina clayey soil, water in the bore hole was bailed to a

    depth of 8.0m below the ground surface on FourSuccessive days, the rise in water Level was recordedas 0.5, 0.8, 1.0 and 1.3m from the bailed out Level.

    Determine by Hvorsluvs method the position of watertable.

    b) In a bore hole, a layer of fine sand was encountered ata depth of 18.0m from the ground surface. A dense sand

    Layer overlies the fine sand Layer. The N valuerecorded in the field was 32. Determine the correct Nvalue for the layer at 18.0m depth. Assume the water

    table at 3.0m below E.G.L. and density of soil above finesand Layer is 1.94T/m3.

    6+6=12

  • Ex/CE/T/324/71/2012

    BACHELOR OF ENGINEERING IN CIVIL ENGINEERINGEXAMINATION, 2012

    ( 3rd Year, 2nd Semester )

    THEORY OF STRUCTURES - III

    Time : Three hours Full Marks : 100

    (50 marks for each part)

    Use a separate Answer-Script for each part.

    PART I

    Answer any two questions.

    Assume suitable values of any data not given.

    1. ABC is a beam which is continuous over support B and simply

    supported over ends A and C. Span AB = 4th span BC = 6th .

    Draw the influence line diagram for support reaction at C using

    Muller Breslaus principle. Adopt 2nd interval for obtaining values

    of ordinates. 25

    2. a) Derive the relationship between the deflection in the

    prototype and that in the model. How the reactions in the

    prototype and that in the models are related? 10

    b) State the Muller Breslaus Principle and explain its use for

    obtaining the influence lines for statically indeterminate

    structures. 8

    c) In a continuous beam to determine the maximum span

    moment, live loads are placed on the same span and then

    alternate spans explain with influence line diagram. 7

    [ Turn over

  • 3. A suspension cable 60 m span and 10 m maximum dip at the

    centre carries a dead load of 15 KN/m through out and a

    uniformly distributed live load (moving) of 10 m length of

    intensity 20 KN/m. The cable is stiffened by a three hinged

    girder (symmetrical). Calculate also the overturning force on

    the pier. The anchor makes an angle 40o with the pier and the

    cable runs over a pulley devices. Draw the BMD of the girder

    for the critical position of the live load. 25

    PART II

    Answer any two questions.

    4. Analyse the continuous beam ABCD as shown in Fig.1 by

    Stiffness Method assuming that there is no settlement of

    supports. Calculate the support reactions. EI is same for all

    members. 25

    5. Analyse the truss ABC as shown in Fig.2 by Stiffness Method

    assuming that there is no settlement of supports. The cross-

    sectional areas of all members are same. Calculate the support

    reactions and forces developed in all members. 25

    6. Analyse the continuous beam ABC as shown in Fig.3 by

    Flexibility Method. Calculate the support reactions. EI is

    same for all the spans. 25

    Fig.1

    Fig. 2

    Fig. 3

    [ 2 ] [ 3 ]

  • Ex/CE/T/324/71/2011

    BACHELOR OF CIVIL ENGINEERING EXAMINATION, 2011( 3rd Year, 2nd Semester )

    THEORY OF STRUCTURES - III

    Time : Three Hours Full Marks - 100

    Use a separate Answer-Script for each Part

    (50 marks for each part)

    PART - I

    Answer any two questions

    1. Analyse the beam as loaded shown below and hence draw BMD.Apply stiffness approach" using "system concept". 25

    2. Find out vertical and horizontal component of displacement at Bof the truss as loaded shown below. Apply "Member approach".AE=Constant. 25

    [ Turn over

  • - 2 - - 5 -

    3. Analyse the beam as loaded shown below and hence draw BMD.Apply "Flexibility approach" using "system concept". 25

    PART - I

    Answer any two questions

    Assume suitable values of any data not given

    1. a) Find out the influence live diagram for the vertical reactionat B of a propped cantilever beam (Ref Fig Q. 1a). What isthe shape of the influence line.

    b) Derive the relationship between the deflection in the prototypeand that in the model.

    c) What are advantages of model analysis of structures?

    2. ABC is a two span continuous beam which is hinged at A and Cand continuous over the support B. span of AB=5m and BC= 3m.Moment of inertia of AB =2I and of BC=I. Draw the influenceline diagram for support reaction at C using Muller Breslau'sprinciple. Adopt 1m interval for obtaining values of ordinate. 25

    3. A suspension cable of 36 m span and 6m maximum dip at thecentre carries a dead load of 10 kN/m through out and a uniformlydistributed live load of 18 m length of intensity 40 kN/m whichcovers left hand half span. The cable is stiffened by a three hingedgirder with two hinges at the abutments and third at the centre.

    a) Draw the B.M.D. and S.F.D. for the girder giving values atsalient points

    b) Calculate the maximum tension in the cable. 25

  • Ex/CE/T/324/74/2010

    BACHELOR OF CIVIL ENGG. EXAMINATION, 2010

    (3rd Year, 2nd Semester)

    THEORY OF STRUCTURES - III

    Time : Three hours Full Marks : 100

    (50 marks for each part) Use a separate Answer - Script for each part. PART I

    Answer any two questions.

    1. Analyse the continuous beam ABC as shown in Fig Q.1

    by flexibility method. Also draw BM diagram. 25

    2. Analyse the truss shown in Fig.Q 2 by flexibility method.

    Calculate the support reactions and member forces. AEis same for all the members. 25

    [ Turn Over ]

    cable. Calculate also the overturning force on the pier.

    The anchor makes an angle of 450 with the pier and thecable run over a pulley device. 25

    X

    ( 4 )

  • ( 3 )( 2 )

    3. Analyse the beam as shown in Fig.Q.3 by stiffnessmethod. Draw BM diagram of the beam. TakeEI = constant throughout. 25

    4. a) What is Kinematic indeterminacy ? What are the degreeof Kinematic indeterminacy of a two storied single bag

    portal frame fixed at base. 7

    b) Analyse the truss as shown in Fig Q.4(b) by stiffnessmethod. Calculate the displacements at D. Take AE issame for all members. 1

    PART II

    Answer any two questions.

    Assume suitable values of any data not given.

    5. a) State the Muller Breslaus principle and explain its use

    for obtaining the influence lines for statically indeterminate

    structures. 10

    b) Derive the relationship between the deflection in the

    prototype and that in the model. 8

    c) In a continuous beam, to determine the maximum support

    moment,live loads are placed on two adjacent span of

    the support and then alternate spans explain with

    influence line diagram. 7

    6. ABC is a beam which is continuous over the support B

    and simply supported over ends A and C. Span AB = 6m

    and BC = 4m. Draw the influence line diagram for support

    reaction at A using Muller Breslaus principle. Adopt 2 m

    interval for obtaining values of ordinates. 25

    7. A suspension cable of 50 m span and 8 m maximum dip

    at centre carries a dead load of 15 KN / m through out

    and a uniformly distribuetd live load of 25 m length of an

    intensity 20 KN / m which covers right hand half span.

    The cable is stiffened by a three hinged girder

    (symmetrical). Calculate the maximum tension in the

    [ Turn Over ]

  • Ex/CE/T/324/71/2011(S)

    BACHELOR OF CIVIL ENGG. EXAMINATION, 2011

    (3rd Year, 2nd Semester, Supplementary)

    Theory of Structures - III

    Time : Three hours Full Marks : 100

    Use a Separate answer Script for each part.

    PART I

    (50 marks)

    Answer any two questions.

    1. Analyse the beam as loaded shown below and hencedraw BMD. Apply Stiffness approach using System

    Concept EI = Constant.

    2. Analyse the beam as loaded shown below and hencedraw BMD. Apply Flexibility approach using System

    concept. EI . constant.

    [ Turn Over ]

  • ( 2 ) ( 3 )

    3. Find out the vertical and horizontal component ofdisplacement at A of the truss as loaded shown below.Apply Member approach. AE = Constant.

    PART II

    (50 marks)

    Answer any two Questions.

    Assume suitable values of any data not given.

    4. The cables of a suspension bridge have a span of 100mand a central dip of 10m. Each cable is stiffened by agirder hinged at the ends and at the middle. A dead load

    of 20KN/m acts on each girder and a live load of length20m moves over the girder. Determine the maximum cabletension when the live load is situated on the left half of

    the stiffening girder such that the right end of the load isjust over the central hinge. Also obtain the S.F. and B.M.diagrams of the girder. 25

    5. ABC is a continuous beam having span AB = 16m and

    BC = 12m. The beam is hinged at A, continuous over the

    support B and rests on roller at C. With the help of Mu& llerBreslau Principle ob tain the influence line for verticalreaction at A indicating ordinates at 4m interval. 25

    6. a) Draw qualitative influence line diagrams of a single bayportal frame for horizontal reaction and bending moment

    at right support. Assume supports are fixed. 10

    b) Derive the relationship between the deflection in theprototype and that in the model. 15

    x

  • Ex/CE/T/324/61/2009

    BACHELOR OF CIVIL ENGG. EXAMINATION, 2009

    ( 3rd Year, 2nd Semester)

    THEORY OF STRUCTURES - III

    Time : Three hours Full Marks : 100

    (50 marks for each part)

    Use separate Answer-Script for each part.

    Part-I

    Answer any two questions.

    1. a) State and explain the Muller Breslaus principle. 6

    b) A two hinged parabolic arch of span 50 m and rise 8 m.

    Draw the influence line diagram for Horizontal reaction,

    bending moment shear force at a distance 20 m from

    the left support. Using these influence lines determine

    the horizontal reaction bendingmoment and shear force

    at that section due to Concentrated load of 10 kN at the

    centre. Assume I = Ic Sec a . 19

    2. A suspension bridge of 200 m span has a dip of 20 m.

    Each cable is stiffened by a three hinged girder. There

    is a uniformly distributed load (dead) and a of 20 kN/m

    on each girder and a live load of 15 kN/m of length 15m.

    Determine the maximum tension in the cable when the

    live load is placed on the left half of the stiffening girder

    [ TURN OVER ]

  • ( 2 ) ( 3 )

    in such a way that right end of the live load is just over

    the central hinge. Calculate also the overturning force on

    the pier when the cable runs over pulley. The anchor

    makes an angle of 40o with the piers. 25

    3. a) Draw the ILD for the vertical reaction at the central

    support of a two span continuous beam of span 8 m

    each. Show ordinates at 2m interval. Assume

    EI = Constant. 17

    b) Derive the relationship between the deflection in the

    prototype and that in the model. 5

    c) What are the limitations of model analysis. 3

    Part-II

    Answer any two questions.

    4. Analyse the continuous beam ABC as shown in Fig 1. by

    Flexibility Method. It is given that support A rotates in

    clockwise direction by 0.01rad. Calculate the support

    reactions. EI is 64000 KN-m2 for all the spans. 25

    5. Analyse the truss as shown in Fig. 2 by Flexibility

    Method. Calculate the support reactions and the

    member forces. EA is same for all the members. 25

    6. Analyse the continuous beam ABCD as shown in Fig.3

    by Stiffness Method assuming that all the supports are

    unyielding. Calculate the support reactions. EI is same

    for all spans. 25

    7. Analyse the truss as shown in Fig. 4 by Stiffness

    Method. Calculate the support reactions and all member

    forces. 25

    Fig . 1

    20 KN

  • Ex/CE/T/321/70/2012

    BACHELOR OF ENGINEERING IN CIVIL ENGINEERING EXAMINATION, 2012

    ( 3rd Year, 2nd Semester )

    TRANSPORTATION ENGINEERING - I

    Time : Three hours Full Marks : 100

    (50 marks for each part)

    Use a separate Answer-Script for each part.

    PART I

    [Turn over

  • [ 2 ]

  • [ 3 ]

  • Ex/CE/T/321/70/2011(S)

    BACHELOR OF CIVIL ENGG. EXAMINATION, 2011(3rd Year, 2nd Semester, Supplementary)

    Transportation Engineering I

    Time : Three hours Full Marks : 100

    Use a Separate answer-Script for each part.

    PART I

    (50 marks)

    Answer all Questions

    Assume standard and relevantvalue for any data not given

    1. Answer the following Questions. 18

    a) Explain which type of vertical curve requires a transitionpart and why?

    b) Find the compensated grade for a curve of radius 250msituated in a gradient of 1 in 18.

    c) Draw a typical cross sectional figure of a non-urbanhighway with median strip and all types of boundaries.

    d) Draw a typical figure of a cloverleaf interchange.

    State the criterion of finding carriageway width of a rotary.

    2. A falling gradient of 1 in 40 is followed by a rising gradientof 1 in 80 on a 2-lane 2-way divided highway. The designspeed of the highway is 60 KmpH. State with reason thetype of the vertical curve that is to be fitted at thisjunction. Find the length of the curve considering

    [ Turn Over ]

  • ( 2 )

    that overtaking is allowed in the curve.Assume Cocfficient of braking friction = 0.34, brakingefficiency = 80%, reaction time for braking = 2.5secs,

    reaction time for overtaking = 2.0secs, speed ofovertaken vehicle = 40KmpH, acceleration duringovertaking = 1KmpH/sec. 2+14

    3. b) For a highway curve of radius 250m and length 200m

    situated in a non built-up urban area over a plain terrainwith available setback of 4m find the maximum permissiblespeed considering all types of safety parameters if

    overtaking is not allowed in the curve. Also determine thecorresponding length of the transition curve. Considermaximum value of lateral friction as 0.12 and maximum

    superelevation of 1 in 15 applied at a rate of 1in 100about the centre. Assume coefficient of braking friction= 0.34, braking efficiency = 80% and reaction time for

    braking = 2.5 secs. 16

    b) How adzing of sleepers, tilting of rails and coning ofwheels help to provide the thread of wheels in absolutelydead centre position on the head of the rails? Take thehelp of neat sketch if required. 6

    c) For what reasons theoretical elastic model of tracksdiffers from the reality in general. 2

    x

    ( 5 )

  • track if 15 trains, 12 trains, 7 trains and 3 trains run atspeeds of 55 kmph, 60 kmph, 75 kmph and 80 kmphrespectively? 4

    b) If a B.G. track is laid with welded rails of 26 m length usinga sleeper density of M+6, find out the number of sleepersrequired for constructing a railway track 780m long. 3

    c) Discuss about the requirements of rails. 8

    6. a) To negotiate curves safely, which factors have to beconsidered? 3

    b) Give the tree-structured presentation of categorizationof types of wear of rails. 3

    c) Suggest suitable measures to reduce the effect of wearon rails. 7

    d) What are the governing factors to fix the sleeper density?2

    7. a) What will be the steepest gradient on a straight trackwhen the following conditions exist, for a train having 16wagons when

    Weight of each wagon = 18 tonnes. Speed of thetrain = 60 kmph.,

    Rolling resistance of wagon = 2.5 kg/tonnes, weight ofthe locomotive = 120 tonnes,

    Tractive effort of locomotive = 12 tonnes,

    Given, resistance depending upon the speed = 0.00008wv, atmospheric resistance = 0.0000006wv2

    where all notations stand for their conventional meanings.7

    ( 4 ) ( 3 )

    [ Turn Over ]

    PART II

    (50 marks)

    Maintain neatness. Assume reasonable data if it is not supplied. Question no. 1 is mandatory Answer any other two questions alongwith question no.1 All drawings-must be drawn by pencil No code etc. will be needed to answer the questions of

    this part

    4. a) Upon which factors hauling capacity depends? 1

    b) What will be the axle load for weight of rail of 60 kg/m?

    2

    c) What ratio is adopted in side slope of ballast section inthe permanent way (theoretically)? 1

    d) Mention the relative merits and demerits of bull-headedrails (B.H. Rails). 5

    e) Compare between timber, metal and concrete sleepers

    depending upon the common points to show their relativemerits or demerits. 10

    f) The number of sleepers per rail varies in India from M+Xto M+Y. What are the values of X and Y? 1

    5. a) What is the equilibrium cant on a 3 degree MG curved

  • Ex/CE/T/326/61/2009

    BACHELOR OF CIVIL ENGG. EXAMINATION, 2009(3rd Year, 2nd Semester)

    VALUATION, PRICING AND CONTRACT

    Time : Three hours Full Marks : 100(50 marks for each part)

    Use a separate Answer-Script for each part.

    PART I

    Answer any three questions.Two marks are reserved for neatness.

    1. a) Pricing of a building is very much related to cost ofconstruction, which in turn is evaluated from the quantityestimation and the current cost of individual item of work(analysis of rate) of the building. Explain this statement.

    3

    b) What essential cost components are necessary toanalyze the rate of individual item of work? Whatadditional cost factors are considered while doing the

    rate analysis? Site one example only to show how youwould arrive at the material statement necessary for theabove purpose? 1+1+3=5

    c) Explain whether the site of work influences the rate of an

    item. 2

    d) Draw up a preliminary estimated cost of a 120 bed-

    hospital building, in order to assess the amount of fund[ TURN OVER ]

    PART II

    Answer any two questions.

    6. Elaborate how the item Earth work in excavation is

    detailed in Bill of quantities (within 100 words) and inDetailed specification document (within 300 words). 25

    7. What is a contract? Name the different types of contractsthat are normally used in civil engineering project. Define

    and discuss the advantages and disadvantages of Itemrate contract. 25

    8. Write short notes on - Labour contract, Source approval and

    frequency testing. Explain how Project planning isimportant from client and contractors point of view. (within150 words). 10+15

  • to be allotted for the said purpose.Given the following :Carpet area required per bed = 4.5 square metre

    Area of corridor, verandah, lavatories etc. to the plintharea of the building is 40% and area of walls is 20%.Plinth area rate = Rs. 10,000/- per square meter.

    Cost of water supply = 5% of the building cost.

    Cost of sanitation = 634 % of the building cost.

    Cost of electrification = 12% of the building cost.Cost of approach road and boundary wall = 5% of the

    building cost.Contingency and work-charged establishment @ 5% and2% of the total cost respectively.

    2. a) Two similar buildings are constructed at two different places of a township at a stated time - one at the very heart of it and another at the outskirt. What is your

    comment regarding cost and value of the two properties?3

    b) A purchase of property may be made for investment. Isvaluation of the property necessary to find the investmenton the property? In what condition this purchase may be

    worthy if compared with other type of investments?1+2=3

    c) Would it be wise to consider annual sinking fund as oneof the outgoings from the gross income of a property?

    2

    ( 2 )

    where as to the depth of 20m, the area is valued at Rs.8,000/- per sqm.on 12m wide road. 8

    ( 5 )

    Fig-1[ TURN OVER ]

  • ( 4 )

    is no income from the property. Estimate the present

    value of the land assuming 6 78 % compound interest per

    annum. 6

    4. a) What is salami? 2

    b) What do you mean by rack rent and profit rental? 2

    c) A person is negotiating for 51 years lease of premisesworth net rent of Rs. 5000/- per month. He is willing to

    pay salami and a rent of Rs. 3000/- per month. Hedeserves 8% interest on capital and 7% interest onredemption of capital. What salami will he have to pay?

    If the lessee is asked to pay salami of Rs. 2,00,000/-,what monthly rent he will pay? 4+4=8

    d) A man takes a lease of a plot of land and pays a groundrent of Rs. 2000/- per month. He erects a building on thesite at the cost of Rs. 6,00,000/-. What is the virtual

    rent? Consider 9% interest on capital and 7% interest onsinking fund and the lease is for 99 years. 4

    5. a) Discuss how the value of the land is influenced by the

    following factors (any four) : 4x2=8i) Location ii) Size iii) Shape iv) Frontage and depthv) Vista vi) Return frontage vii) Width of the road in front

    of the plot.

    b) Find the value of the plot of land (Fig.1) by Belting

    Method, given that to the depth of 24m, the area isvalued at Rs. 10,000/- per sqm. on 15m wide road,

    [ TURN OVER ]

    d) How net income of a property is related with itscapitalized value and years purchase? 2

    e) A property is to produce a gross income of Rs.15,000/- per

    annum. The outgoings may be considered as 20% of the

    gross income. The landlord desires a return of 6 34 % on

    capital and 7 14 % on redemption of capital. Find the value

    of the property. 6

    3. a) Depreciation of a building after a period of time isequated to the sinking fund accumulated during thatperiod. Explain this statement. 4

    b) The cost of construction of a building is Rs. 10,00,000/-.

    The building is 15 years old and has future life of 50 years.Considering the sinking fund accumulated during 15 yearsas the depreciation of the building, find the depreciated

    value of the building. Assume 7% interest on capital and

    8 58 % interest on sinking fund. 6

    c) A plot of land was purchased at Rs. 5,00,000/-, 7 years

    back. Immediately after the purchase a sum ofRs.50,000/- was spent for constructing a boundary wall.5 years back he invested further amount of Rs.30,000/

    - for construction of a small hutment for accommodatinga man to guard the property. The annual cost ofmaintenance and management of the property has been

    Rs.5,000/- per annum after purchase. The land remainedunproductive since the time of purchase and hence there

    ( 3 )

  • Ex/CE/T/323/71/2012

    BACHELOR OF ENGINEERING IN CIVIL ENGINEERING EXAMINATION, 2012

    ( 3rd Year, 2nd Semester )

    VALUATION PRICING AND CONTRACT

    Time : Three hours Full Marks : 100

    (50 marks for each part)

    Use a separate Answer-Script for each part.

    PART I

    Answer All questions serially.

    1. Give your legal opinion on following issues. 55

    a) A team of workers in a construction site could not find work after lunch time. They were relieved

    from duty. The contractor paid them for half a days wage. What is the legal position.

    b) Two plumbers on duty in a building site engaged into a fight for their personal reasons. A glass

    door costing Rs. 20,000/- only was broken in the incident. What are the legal positions to the

    contractor.

    c) A contractor constructed M40 concrete columns. The cubes piled and later tests proved only

    M37 strength. The owner ordered to dismantle. The contractor waited for one month and

    conducted tests that proved M40.8 strength. The work continued but the owner did not pay the

    bill for columns. The matter was referred to arbitration. What are the legal positions to the

    arbitrator.

    d) A contract states, The choice of marble quality shall be decided by the Engineer-in-charge whose

    decision shall be final and binding. As per contractors opinion the work was delayed because

    the selected marble is difficult to procure and took additional time for completion of work. The

    work was delayed and referred to arbitration. What are the legal positions.

    [ Turn over

  • e) A contractor was bound to supply teak wood for doors in a building contract. Halfway through

    the work the government notified that teak wood should not be used for buildings. The owner

    insisted for teak wood as per contract terms. The contractor refused to supply. What is the legal

    positions.

    2. What short notes (in about 100 words) for the following : 52

    a) Sufficiency of Tender.

    b) Penalty clause that is liquidated damages for delay.

    3. Present a rate analysis of 1:2:4 concrete in boundary wall columns of 250 mm 400 mm size

    excluding reinforcement but including shuttering. 15

    [ 2 ]

  • Ex/CE/T/326/71/2011

    BACHELOR OF CIVIL ENGINEERING EXAMINATION, 2011( 3rd Year, 2nd Semester )

    VALUATION, PRICING AND CONTRACT

    Time : Three Hours Full Marks - 100

    Use a separate Answer-Script for each Part

    (50 marks for each part)

    PART - I

    Answer any Three questions

    Two marks are reserved for neatness

    1. a) What do you mean by analysis of rate related toconstruction items?

    b) Prepare a material statement for the following item ofwork :

    20 m3 reinforced cement concrete (1 : 1A : 3) with 1%steel.

    c) What lump sum amount is considered with respect tooverhead cost and contractor's profit for finding rate ofeach individual item of work?

    d) What do you mean by contingencies and work-chargedestablishment? How these are included in rate analysis?

    [ Turn over

  • - 2 -

    e) How do you differentiate between approximate costestimate and final cost estimate? 2+5+1+4+1+3=16

    2. a) Establish the relation between year's purchase andcapitalized value.

    b) When and how you would consider sinking fund forfinding year's purchase of a property?

    c) With increase in interest rate year's purchase decreases discuss the significance of this finding.

    d) A property is to produce a net income of Rs.15,000.00 perannum for the next 40 years. Assume that the landlorddesires a return of 6% on his capital and for redemptionof capital the interest rate may be taken as 5%. What isthe value of the property?

    e) What is the amount of Re.1.00 p.a. for 12 years @ 6%interest? Derive the expression used. 3+2+2+5+4=16

    3. a) Name three methods used to find the depreciated value ofa building.

    b) Discuss the method of finding depreciation of a buildingwhere a percentage depreciation is considered.

    - 5 -

    PART - II

    Answer any Two questions

    6. Elaborate how the item "Earthwork in excavation" is detailed in"Bill of quantities (within 100 words) and in "detailedspecification document" (within 300 words). 25

    7. What is a "contract"? Name the different steps that arenormally followed in civil engineering projects. Define anddiscuss the advantages and disadvantages of "item-rate"contract. 25

    8. Write short notes on (each within 150 words) 25a) Technical bidb) PMCc) Workd) Order or Letter of Intente) Global Tender,f) L1 Tenderer.

  • - 4 -

    covered area, find the average rent to be realized per m2

    of rentable area for investment to yield @ 838

    % gross.

    4+12=16

    5. a) How a property is classified as leasehold and freehold?

    b) What do you mean by lesser's interest and lessee'sinterest?

    c) How would you evaluate both the interests with respect toa leasehold property?

    d) Particulars of a leasehold property are given below :i) Lease rent = Rs.2,500.00 per monthii) Net rack rent = Rs.10,000.00 per monthiii) Lease to run for 15 years.

    Assume ground rent is secured at 6% per annum and for

    reversionary value interest is @ 8 23

    % per annum.

    Estimate (i) lesser's interest and (ii) lessee's interest.2+2+4+2x4=16

    - 3 -

    [ Turn over

    c) Determine the present value of a building, which wasconstructed 35 years ago at Rs.1,50,000.00. Theestimated life of the building is 80 years, at the end ofwhich it will have 10% scrap value of its cost ofconstruction. Use the method discussed in question 4 (b).

    d) Discuss i) sentimental valueii) speculative valueiii) distress value 3+4+6+3=16

    4. a) Mention effect of size, shape, orientation and road widthwhile finding value of a plot of land by comparisonmethod.

    b) A land owner proposes to develop a property on a south-facing plot of land on 25 m wide road having a frontageof 45 m and depth 65 m. The front belt is taken up to25 m with the value fixed at Rs.2,000.00 per m2 for thefront belt land. The land owner decides to construct aten-storied building having an overall height of 32 m abovethe ground with 7 m space on the east, 3.5 m on the westand 15 m on the north. If the cost of construction isRs.100.00 per m3 and a rentable area is 65% of the

  • Ex/CE/T/326/71/2011(S)

    BACHELOR OF CIVIL ENGG. EXAMINATION, 2011

    (3rd Year, 2nd Semester, Supplementary)

    Valuation, Pricing and Contract

    Time : Three hours Full Marks : 100

    Use a separate Answer -Script for each part.

    PART I

    (50 marks)

    Answer any three questions.

    Two marks are reserved for neatness.

    1. a) Discuss what do you mean by approximate estimate? 2

    b) Discuss two methods of finding approximate cost of abuilding. 4

    c) Analyse the rate for the following item of work :

    Cement concrete (1:2:4) with graded stonechips (20 mmdown) for R.C. works excluding shuttering and

    reinforcement.

    Given : Material rate

    Stonechips Rs.2450/-per m3

    Coarse sand Rs.875/- per m3

    Cement Rs. 300/- per bag

    Labour rate

    Head mason 1/2 No. Rs. 500/- per head[ Turn Over ]

    x

    ( 4 )

    PART II

    (50 marks)

    Answer any two questions.

    6. Elaborate how the item RCC work is detailed in Bill ofquantities (within 100 words) and in Detailed

    specification document (within 300 words). 25

    7. What is a contract? Name the persons who are entitledto sign a contract. Define and discuss the advantagesand disadvantages of Fixed fee contract. 25

    8. Write short notes on (each within 150 words) Legalsearch of a property, PMC, Work Order or Letter of

    Intent, Global Tender, Force Majure condition. 25

  • ( 2 ) ( 3 )

    [ Turn Over ]

    Mason 3 Nos. Rs.300/- per head

    Mazdoor 24 Nos. Rs. 250/- per head

    Assume any other data necessary.

    Assume contingencies, tools and plants are half percentof the total cost of materials and labour; profit andoverhead are ten percent of the total cost. 10

    2. a) What do you mean by sinking fund and sinking fundcoefficient?

    b) What is deferred income? How the deferred value of aproperty is estimated when

    i) the interest rates for both capital and sinking fund aresame

    ii) when they are different?

    c) What is the present value of a net income of Rs.4000/-per month for a total period of 25 years but will commenceafter the development period of 5 years? The ownerexpects 8% interest per annum on his capital and 6% perannum on investment of sinking fund?

    3+1+2x2+8 = 16

    3. a) What do you mean by depreciation of a building? Howthe depreciation is caused? 4

    b) How would you find the depreciation of a building bysinking fund method? 4

    c) The cost of construction of a new building according topresent market rate is Rs. 1000,000/- having a life of 70years. But if the building is 50 years old, determine thedepreciated value of the building at 6% compoundinterest. 8

    4. a) Discuss rental method of valuation? What information isnecessary to value a property by rental method? Can

    you find separately the value of the land and of thebuilding once the value of the property comprising bothland and building is evaluated by rental method?

    b) A building has been rented on an annual rent of Rs.10,000/-. The life of the building in the present positionis expected to be 20 years. If the major repairs to the

    building are done, its life shall be increased by another15 years. The major repair will cost Rs. 40,000/-.Determine whether it will be advisable to do the major

    repair of the building or not. Assume the rate of interestas 10% for capital and 8% for sinking fund.

    2+2+2+10 = 16

    5. A plot of land is shown in Fig 1. It consists of a building

    having a total built-up area of 300 m2. Assume a primecost of construction at current prices to be Rs.5000/- perm2 and a straight-line depreciation allowing 10% salvage

    value only for the building. What is the value of theproperty if the front belt land (depth of front belt being25m) be estimated at Rs. 1000/- per m2? 16

  • Ex/CE/T/326/74/2010BACHELOR OF CIVIL ENGG. EXAMINATION 2010

    (3rd Year, 2nd Semester)

    VALUATION, PRICING AND CONTRACTS

    Time Three hours Full Marks 100 (50 marks for each part)

    Use a separeate Answer-script for each part.

    PART I

    Question no. 1 is compulsory

    Answer any two from the rest.

    1. a) What are the different operating organizations required for

    a large civil engineering construction project? State theirrole and significance.

    b) Discuss the importance of systematic approach of costing

    for selecting the different SO2 reduction system viz. source

    reduction, flue gas desulphurization and tail gas treatmentin refinery operation. 8+6 = 14

    2. a) Discuss the importance of approximate or preliminary

    estimate. Write short notes on the approach of CentralBuilding Research Institute (CBRI) to estimate the cost of

    ( 4 )

    PART II

    Answer any two Questions.

    5. Elaborate how the item Reinforced Cement ConcreteWork is detailed in Bill of quantities (within 100 words)

    and in Detailed specification document ( within 300words). 25

    6. What is a contract? Name the different types of contractsthat are normally used in cilvil engineering projects. Define

    and discuss the advantages and disadvantages of LumpSum contract. 25

    7. Write short notes on (each within 150 words)Joint Venture

    Companies, Eligibity for signing a contract, Work Order orLetter of Intent, Global Tender, L1 Tenderer. 25

    [ TURN OVER ]

  • a building.3+4

    b) In a locality plinth area rate of a two storied building having1.2 m deep (below G.L.) foundation and 0.9 m highparapet wall is Rs. 9000 per m2. Estimate the cost of a

    similar building of 140 m2 plinth area in that locality. Costof water supply, sanitation and electrification should beconsidered separately. What will be the volume rate of a

    similar building? 5

    c) Do the analysis of rate for first class brick work in cementmortar ( 1:4) in first floor superstructure. 6

    3. a) What is the difference between physical depreciation and

    obsolescence? What are the years purchase inperpetural, for terminable income, single rate and dualrate? 3+4

    b) A person let out his premises at Rs. 24, 000 per annum

    on lease with 4 years to run. The current rental value isRs. 40,000 per annum net. 10% return is expected fromthe property and the annual lease rent interest is 8%.

    Determine the value of the property to the owner. 6

    c) What is the value of a self occupied building 25 years oldhaving a covered area of 90 m2 when the present cost of

    construction for similar building is Rs. 2000 per m2? Thefuture life of the building is estimated to be 40 years. The

    rate of interest for redemption of capital is 7%. 5

    4. a) Distinguish between unsecured ground rent and secured

    ground rent. 2

    b) A building stands on a free hold property of land, measures600 m2, yields a gross rent of Rs. 1,000 per month. Theprice of land is Rs. 75/m2. The estimated future life of the

    building is 12 years, but it is expected to extend by another16 years, if structural and other repairs costing Rs. 16,000were immediately carried out. The total amount of

    outgoings is 25% of the gross rent. The owner requires7% retrun on land and 11% return on building with 6%redemption of capital. Find out whether it will be advisable

    to spend the above cost of repairs from investment pointof view. 7

    c) Describe return frontage and vistas. 4

    d) Find out the value of the leasehold property on the basis

    of owners interest. A freehold premise let at Rs. 9000

    per annum net on lease with 6 years to run. The current

    rental value is Rs. 12,000. Assume the property is invested

    @ 8% per annum and for reversionary value, interest @

    10% per annum. 5

    ( 2 ) ( 3 )

  • Ex/CE/5/T/306/54/2011(S)

    BACHELOR OF CIVIL ENGG. EXAMINATION, 2011

    (3rd Year, 2nd Semester, Supplementary, Evening)

    Waste water Engineering

    Time : Three hours Full Marks : 100

    (50 marks for each part)

    Use a separate Answer -Script for each part.

    PART I

    Answer Q. No.1 any two from the rest.

    1. a) What is the goal of waste water weatment?

    b) What is waste water? Give examples.

    c) What is sullage? Why is it less objecteonable fromdomestic waste water?

    d) What is separate in separate sewerage system?

    e) What are chemoheterotrophs?

    f) What are different types of effluent standards formunicipal waste water?

    g) Define population equivalent. What is its utility?

    h) What are the differences between TKN and totalnitrogen?

    i) Name the factors which affect self-cleansing velocity most.

    [ Turn Over ]

  • ( 2 )

    j) Define desing rainfall frequency. 2x10 = 20

    2. a) In a 5 day-200C BOD test :

    i) Why the colour of BOD bottle should be black?

    ii) What is dilution? Why is it necessary?

    iii) What is seeding? Give example of a seed.

    iv) Why is incubation period chosen as 5 day?

    v) Why is the incubation temperature chosen as 200C?

    b) A 10.0ml sample of sewage mixed with enough water tofill a 300ml bottle has an initial DO of 9.0 mg/l To assurean accurate test, it is desirable to have at least a 2.0 mg/

    l drop in DO during the five day run and the final DOshould be at least 2.0mg/l .For what range of BOD

    5 would

    this dilution produce the desired result. 5

    3. a) Answer the following as very briefly.

    i) Compare COD value of BOD5 value of a municipal waste

    water sample.

    ii) Why should COD test should be done before BOD test

    for unknown samples?

    iii) Why should COD test be done with BOD test

    simultaneously? 2x3 = 6

    b) Give example of a chemical substance or group ofchemical substances which

    c) Design a suitable primary clarifier having a rectangularcross-section and provision for mechanical cleaning.Given the maximum daily sewage generation = 9.0 million

    litres.

    Assume any relevant data. 7

    8. a) Define the following terms in the context of an Activated

    sludge Process. 2+3+3

    i) Organic loading rate.

    ii) Food to Micro-organism Ratio (F/M)

    iii) Sludge Age.

    b) Design a highrate single stage trickling filter for treating

    a domestic sewage of 125 lpcd having a untreated BOD5

    of 225 mg/L. Assume that the primary treatment removes36% of BOD. Consider an organic loading of 11,000 kg/

    he-m/day (excluding recirculated sewage), a recirculationratio (r) of 1.0 and surface loading rate (includingrecirculated sewage) not excuding 175 mL/ha/day.

    Determine the efficiency of the filter and the BOD5 of the

    treated effluent. 8

    ( 5 )

    x

  • c) What are the effects of these inconveniences in a sewagetreatment plant? 2

    d) Design a screen chamber on the basis of the followingdata. 9

    i) Peak design wet weather flow = 1.325m3/sec

    ii) Velocity through screen at peak design wet weather flow= 0.9 m/sec

    iii) Population of the township = 2,25,000

    iv) Depth of flow in the incoming conduit at peak design flow,D = 1.18m.

    6. a) Describe with the help of a neat schematic diagram thefunctioning of a skimming tank. 6

    b) What are the major sources of oily and greasy

    substances in a municipal waste water? 2

    c) Design a rectangular skimming tank on the basis of a

    peak design wet weather flow of 0.635 m3/sec. Considera minimum detention period of 5.0 min and a velocity ofrise of air bubble of 0.25 m/min. 8

    7. a) State the basic principle behind the process of

    sedimentation. 3

    b) Discuss in brief on the significance of the parameteroverflow rate/ surface loading rate in the context ofsedimentation. 6

    ( 4 ) ( 3 )

    [ Turn Over ]

    i) responses in BOD, COD & TOC test

    ii) responses in COD & TOC test only.

    iii) responses in COD test only. 1x3 = 3

    c) Calculate the thod of water sample containing 90 mg/l

    glucose only. What should be its BOD value and why?4+2

    4. Write brief note on any five of the following :

    a) inlet time

    b) design sanitary waste water flow

    c) minimum velocity in sewers

    d) population equivalent

    e) crown corrosion

    f) inverted siphon

    g) graphical method to calculate intencity of rainfall.3x5 = 15

    PART II

    Answer any three questions

    (Two marks reserved for neatness)

    5. a) Discuss in brief on the significance of a screen chamber.2

    b) What are the possible inconveniences caused by thedebris if not removed at a screen chamber? 3

  • Ex/CE/T/322/73/10

    BACHELOR OF CIVIL ENGG. EXAMINATION, 2010

    (3rd year, 2nd Semester)

    WASTE WATER ENGINEERING

    Time : Three hours Full Marks : 100

    (50 marks for each part)

    Use a separate Answer-Script for each part

    Part I

    Qusetion no. 1 is compusory.

    Answer any two from the rest

    (Assume any data if requied, reasonably)

    1. Write short notes on the following (any five) : 5 x 3 = 15

    i. Potential environmental impact catagories.

    ii. Colour due to sulfide as an indicator of sewage condition.

    iii. Significance of 104oC and 180oC C for determination of TSSand TDS.

    iv. Advantages of Linear alkyl sulfonated. (Las) overAlkylbenze sulfonates (ABS).

    v. Significance of Radon222 as a radioactive material onhuman.

    vi. Growth factor requirement of bacteria

    [ TURN OVER ]

  • vii. Drop manhole.

    viii. Necessity of azife in BOD determination.

    2. a) How the status of wastewater degradation is indicated by

    the different forms of nitrogen? 13 2

    b) Determine the CBOD, NBOD and ThOD for 0.1M solution

    of ( )[ ]2 2CH NH COOH 5c) Describe Fujimoto method and its limitations. 3

    d) Compute BODu and BOD rate constant k from the followingBOD data of a wastewater sample at 200 C . 6

    Time (d) 0 1 2 3 4 5

    BOD (mg/I) 0 65 109 138 158 172

    3. a) What are the advantags and disadvantages of combinedsewere? 12 2

    b) What is intensity duration frequency curve? What is itssignificance in Rational method of runoff estimation? 6

    c)

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    A1 = 3 ha

    C1 = 0.6

    C2 = 0.70

    A2 = 5.0 ha

    C3 = 0.70

    A3 = 6 ha

    C4 = 0.8

    A4 = 5 ha

    M1 300m M

    2 300m M

    3 300m M

    4

    l l l

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    i) components of MLSSii) Type of microorganisms and their functioniii) Purpose of aeration 6b) Explain briefly the sludge volume index (SVI) and its

    importance and develop a relation among MLSSconcentration, sludge recirculation ratio and SVI with a flowdiagram of activated sludge process.A conventional activated sludge process for treating anaverage flow of 15 milion litres/day (MLD) of wastewaterwith influent BOD

    5 of 310 mg/L is to be designed. 35% of

    BOD5 is removal in the primary settling tank. The operating

    MLSS concentration in the aeration tank is proposed to be2400 mg/L and the sludge.Volume after 30 minutes settling in a 1000 ml graduatedcylinder is 204 ml. Required hydraulic retention time is 7.5hours.Compute the followiing with comments :i) SVIii) Sludge recirculation ratio and flow of return sludge.iii) Volume of aeration tankiv) F/M ratiov) Volumetric loading rate. 10

    8. a) Write short notes with sketches on :i) Step aeration activated sludge process.ii) Extended aeration process using oxidation ditch. 8

    b) Design a household septic tank including effluent disposalsystem with sub-surface soil disperssion trenches for 50users with a probable peak discharge of 70 litres/minute.

    l The basis for design is to be elaborated.

    l No sketch is required. 8

    x

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    Part - II

    Answer any three questions.

    Two marks for neatness.

    Assume appropriate data not given.

    5. a) Draw a flow diagram for the treatment of domesticwastewater including sludge disposeal system using, amongother units, two-stage trickling filter, intermediate clarifierand sludge thickener.

    Also briefly explain the function of the sludge thickener. 5

    b) The channel profile of a grit chamber should be parabolic,if a rectangular weir is placed at the exit and of the channeldiscuss and prove mathematically. Also give a sketchshowing the weir at the exit end. 6

    c) Why is it necessary to remove grist from wastewater? Whatis the diofference between a grit chamber and a detritustank? 5

    6. a) Why oil and grease are to be removed from wastewater?comment on the type of air bubbles to be provided in anaerated skimming tank. 4

    b) What are the purposes of recirculation in trickling filter?Corelate recirculation ratio and recirculation factor andcomment with some example. 6

    c) A single unit high rate trickling filter is to be designed totreat 2500m3/day of primary settled wastewater having aBOD

    5 of 160mg/L. The BOD

    5 loading (excluding recirculation)

    is 0.7 kg/day/m3. BOD5 of the final effluent is 25mg/L.

    Design the trickling filter and check the adequacies. 6

    7. a) In the context of activated sludge process discuss brieflyon the following :

    In the above figure the sewer line M1 to M

    2 for storm water

    drainage is already designed and the velocity when full flowis 1 m/s. Design the diameter (mm) and the velocity (m/s) ofthe circular storm sewer M

    2 to M

    3 when flowing full. 9

    Given data :

    i) Design storm frequency = 2 month

    ii) i = 0.375 0.96200.1x F / t ; where i = intensity in cm/hr,,F = frequency in years t = Duration in Min

    iii) Slope of the proposed sewer M2M

    3 = 0.001

    iv) Mannings coefficient of roughness = 0.011

    v) Inlet time = 15 min.

    Assume any other data as necessary.

    Also find out the velocity and discharge through the circularsewer M

    2M

    3 when flowing half-full.

    4. a) What are Trihalomethanes (THMs) and their toxicity?13 2

    b) Discuss human toxicity of alpha, beta, and gamma radiationwith respect to penetration power. 4

    c) Discuss the effect of chlorinated pesticides on environment.

    3

    d) What is MPN test? 3

    e) A diary, processing about 1,33,000 kg of milk daily, producesan average of 246 m3/d of wastewater with a BOD of 1400mg/l. Compute the wastewater flow and BOD per 1000 kgof milk processed. Also find the equivalent population ofthe daily waste discharge. 4

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    [ TURN OVER ]

  • Ex/CE/T/32