II YR - ME · ... Describe with a neat sketch the Slider crank mechanism. OR 3) ... Explain the...

(DME 211)

B.Tech. DEGREE EXAMINATION, NOV./DEC. – 2014

(Examination at the end of Second Year)

MECHANICAL ENGINEERING

Paper - I : Engineering Mathematics - III

Time : 3 Hours Maximum Marks: 75

Answer Question No.1 is compulsory (15)

Answer one question from each unit (4×15 = 60)

1) a) Find Fourier Series expansion of f(x) = |x| in –π<x< π.

b) Write the complex form of Fourier Series.

c) In the Fourier Series expansion of f(x) = |sinx| in (-π, π) find the value of bn.

d) Find the Fourier sine Transform of .

e) Find the Fourier transform of second derivative of u(x, t)

f) If F f(x) = F(S), then find Ff(x-a).

g) A die is Tossed thrice. A success is getting 1 or 6 on a toss. Find the mean of the

number of successes.

h) What is the number of possible samples of size ‘n’ out of N population units without

replacement.

i) What is the standard error of the statistic sample mean .

j) In a sample of 500 people in Maharashtra 300 are wheat eaters. Then what is the

maximum error with 99% confidence.

k) If in a city 250 men out of 750 men were found to be smokers, what is the test

statistic |z|.

l) If n = 40, σ = 2.06 then find the maximum error with 99% confidence.

m) Define complex Inversion formula.

n) Find the values of a0, an if f(x) an odd function in (-l, l).

o) What is the value of P(z > 1.76)?

UNIT - I

2) Expand f(x) = x sinx as a fourier series.

OR

3) Find the fourier series Expansion of f(x) = 2x – x2 in (0, 3) and hence deduce that .

UNIT - II

4) a) Find the fourier transform of , a > 0, hence deduce that is self

Reciprocal in respect of Fourier transform

b) Using Parseval’s identity prove that

OR

5) a) Evaluate L-1 By the method of Residues.

b) Find the Fourier sine transform of .

UNIT - III

6) a) Determine the probability of getting the sum 6, exactly 3 times in 7 throws with a

pair of Fairdice.

b) In a Normal distribution 7% of the items are under 35 and 89% are under 63.

Determine the Mean and Variance of the Distribution.

OR

7) a) Find the Mean and standard deviation of sampling distribution of variances for the

population 2, 3, 4, 5 by drawing sample size of two path replacement.

b) The mean height of students in a college is 155 cms, and standard

deviation is 15. What is the probability that the mean height of 36 students is less

than 157 cms.

UNIT - IV

8) a) What is the size of the smallest sample required to estimate an unknown proportion to

within a maximum error of 0.06 with atleast 95% confidence.

b) The mean of Random sample is an unbiased estimate of the mean of the population

3, 6, 9, 15, 27 then

i) List all possible samples of size 3 that can be taken from the finite population

without replacement.

ii) Calculate the mean of each sample listed in (i) and assigning each sample a

probability of . Verify that the mean of these is equal to 12. Which is

equal to the mean of the population . i.e. E( = . i.e. prove that is an

unbiased estimate of .

OR

9) a) A sample of 900 members has a mean of 3.4 cms and S.D. 2.61 cms. Is the sample

from a large population of mean 3.25cm, and S.D. 2.61 cms. If the population is

normal and its mean is unknown find the 95% fiducial limits of true mean.

b) Random samples of 400 men and 600 women were asked whether they would like to

have a flyover near their residence. 200 men and 325 women were infavour of the

proposal. Test the hypothesis that proportions of men and women in favour of the

proposal are same at 5% level.

(DME 212)




Paper - II : Mechanics of Materials



Answer one questions from each unit (4×15 = 60)

1) a) State the assumptions in Lame’s theory.

b) Explain Rankine Formula.

c) State the assumptions in Winkler-Bach Theory.

d) Give the limitations of Euler’s formula.

e) List out the rules to be followed by moment are Method.

UNIT - I

2) A horizontal beam AB is freely supported at A and B 9m apart and carries a uniformly

distributed load of 20kN/m run (including its own weight). A clockwise moment of 180

kN-m is applied to the beam at a point C, 4m from the left hand support A. Calculate the

reactions at A and B, and sketch the bending moment diagram for the beam, stating

principal values. Calculate the slope and deflection of the beam at C if E.I. = 15×104 kN-

m2.

OR

3) A coloumn fixed at both ends is initially curved whose equation of curve is given by y =

0.5 sin It is subjected to an axial load of 50 kN in compression at 1.5 cm eccentricity.

Determine the maximum stress induced if its cross section is 6m × 8m. E = 200 GPa.

UNIT - II

4) a) A Cantilever of span 4m carries a udl of 3kN/m from free end to the mid point of the

beam. Calculate the slope and deflection at the free end by moment area method.

b) A simply supported steel beam having uniform crosssection is 14m span and is

simply supported at its ends. It carries a concentrated load of 120 kN and 80 kN at

two points 3m and 9.5m from left and respectively. If the moment of inertia of the

section is 160 × 107 mm4 and E = 210 Gpa. Calculate the deflection of the beam at

loaded points.

OR

5) Determine the deflection and slope under the beam shown in figure below by conjugate

beam method. E = 200 GPa and I = 15 × 104cm4.

UNIT - III

6) A gun metal cylinder 12cm external diameter and 7.995cm internal diameter is forced onto

a steel cylinder 8cm external diameter and 4cm internal diameter. Calculate the maximum

resulting stresses in the steel and gunmetal. Esteel = 200GPa, Egunmetal = 100 GPa Poisson’s

ratio is 0.35 for both metals.

OR

7) A ring is made of stock with a circular crosssection 8cm in diameter. The inside diameter

of the ring is 10cm. The load P is 20 kN. Calculate the stresses at A & B.

UNIT - IV

8) A built up ring consists of an inner copper ring and outer steel ring. The diameter of the

surface of contact of the two rings is 60cm. Determine the stresses setup in the steel and

copper by rotation of the ring at 2500 r.p.m. Both the rings are of rectangular crosssection

15mm in the radial direction perpendicular to the plane of the ring.

OR

9) A hollow cylinder of 40 cm external diameter and 20 cm internal diameter is rotating

at 3000 r.p.m. Determine the distribution of radial and hoop stresses in the cylinder.

Density of cylinder material is 7800 Kg/m3, γ = 0.3

(DME 213)




Paper - III : Kinematics of Machines




1) Write short notes on the following:

a) Classification of Mechanism.

b) Instantaneous centre.

c) Tasks of dimensional synthesis.

d) Flat faced follower.

e) Gear terminology.

f) Epicyclic Gear Train.

g) Kinematic Pairs.

UNIT - I

2) a) Classify the kinematic links with suitable examples.

b) Describe with a neat sketch the Slider crank mechanism.

OR

3) The dimensions of various links of the mechanism shown in figure are OA = 50mm, AB =

400mm, CD = 100 mm, and DE = 250mm. The crank OA rotates at 60 rpm. Find the

velocity of slider E by relative velocity method.

UNIT - II

4) a) For the Four-link Mechanism shown in figure, find the angular velocities of the links

BC and CD using the instantaneous centre method.

b) Explain the crank and slotted lever mechanism.

OR

5) a) Explain the Kennedy’s theorem.

b) Discussion the Acceleration of offset points.

UNIT - III

6) Explain the Freudeustein equation for function generation.

OR

7) From the following data, draw the profile of a cam in which a roller follower moves with

SHM during ascent while it moves with uniform and equal acceleration and retardation

during descent. Least radius of the cam = 60mm. Angle of ascent = 72º; Angle of dwell

between ascent and descent = 42º; Angle of descent = 90º; Lift of the follower = 60mm;

Diameter of roller = 40 mm; Distance between the line of action of the follower and axis of

the cam = 30 mm.

If the cam rotates at 540 rpm anti clockwise, find the maximum velocity and

acceleration of the follower during ascent.

UNIT - IV

8) a) State the fundamental law of gearing. When can the meshing teeth be called

conjugate?

b) Two gear wheels have 28 and 45 teeth respectively and a standard addendum of one

module. Find the lengths of the path of contact and arc of contact when the pressure

angle is 20º.

OR

9) An epicyclic gear train consists of two Sun wheels 1 and 2 with 24 and 28 teeth

respectively. They engage with a compound planet wheel consisting of two gear wheels 3

and 4. The wheel 1 engages with wheel 3, and wheel 2 engages with the wheel 4. The

wheels 3 and 4 have 26 and 22 teeth. The gear 1 is keyed to the driver shaft while the

wheel 2 is fixed coaxial with the driven shaft. The planet wheel is carried on an arm from

the driving shaft which is co-axial with the driven shaft. Find the velocity ratio of the gear

drive. If 1 KW of power is transmitted at input speed of 100 rpm. What is the holding

torque on the fixed wheel 2 ?

(DME 214)




Paper - IV : Fluid Mechanics



Answer One question from each unit (4×15 = 60)

1) Write short notes on the following:

a) Pascal’s Law.

b) Buoyancy.

c) Water hammer

d) Stream function.

e) Minor losses.

f) Boundary layer thickness.

UNIT - I

2) a) List all the fluid properties and explain why water rises in a small glass tube. When

inserted in water.

b) Find the height through which water rises by capillary action in a glass tube of 2mm

bore if the surface tension at the prevailing temperature is 0.075N/m.

OR

3) a) How does the pressure vary with depth in a static fluid? Derive the required equation.

b) A circular plate of diameter 0.75m is immersed in a liquid of relative

density 0.80 with its plane making an angle of 30º with the horizontal. The centre of

the plate is at a depth of 1.50m below the free surface. Calculate the total force on

one side of the plate and the location of centre of pressure.

UNIT - II

4) a) What are different types of flows? Explain in detail.

b) Derive the equation of continuity in three dimension form.

OR

5) a) Derive the Bernoulli’s equation from Euler’s equation. State the assumption made.

b) Derive the expression for computing discharge through an orifice meter.

UNIT - III

6) a) Derive Hazen Poiscile Equation for laminar flow in a circular pipe.

b) What is the expression for Reynolds number for laminar flow in a pipe line?

OR

7) A 6cm diameter pipe has a discharge of 450 l/min. At a section the pipe has a sudden

expansion to a size of 9cm diameter. If the pressure just upstream of the expansion is 20

kN/m2. Calculate the pressure just after the expansion. Assume the pipe to be horizontal.

UNIT - IV

8) a) What are the characteristics of boundary layer formation over a flat plate?

b) Define drag and lift. Discuss the boundary layer separation.

OR

9) a) Derive an expression for Mach Cone.

b) Explain flow of compressible fluid through venturimeter.

(DME 215)




Paper - V : Basic Thermodynamics




1) a) Define the term thermodynamics.

b) What is meant by thermodynamics system? How do you classify it?

c) What is thermodynamic property?

d) What do you understand by equilibrium of a system?

e) What is Quasi-static process?

f) Define the term enthalpy.

g) State Carnot’s theorem.

UNIT - I

2) a) What are the differences between system and control volume? Explain different

types of systems with examples.

b) A gas undergoes a reversible non-flow process according to the relation P = (-5V +

17) where V is the volume in m3 and P is the pressure in bar. Determine the work

done when the volume changes from 2.8 to 5.6 m3.

OR

3) a) State and explain zeroth Law of thermodynamics and also explain the

important property evolved based on the above law.

b) A gas expands according to the equation PV = 98, where P is the pressure in kPa and

V is the specific volume in m3/kg. The initial pressure of the gas is 993kPa and the

final pressure is 488kPa. The gas is then heated at constant volume back to it. So

orginal pressure of 993 kpa. Determine the work of combined process. Also sketch

the process on P-V and T-S coordinates.

UNIT - II

4) a) Explain the first law of thermodynamics for a system undergoing a cycle and for a

change in state of system.

b) Steam enters an engine at a pressure 14 bar absolute and 200ºC. It is

exhausted at 0.2 bar.

The steam at exhaust is 0.9 dry. Find

i) Drop in enthalpy.

ii) Change in entropy of the system.

OR

5) a) Make an energy analysis of the steam turbine and steam nozzle.

b) An air compressor handles 8.5 m3/min of air with a density of 1.26 kg/m3 and a

pressure of 1bar and it discharges 445 kPa with a density of 4.86 kg/m3. The change

in specific internal energy across the compressor is 82 KJ/kg and the heat loss by

cooling is 24 KJ/kg neglecting KE and PE, find the work done.

UNIT - III

6) a) State the Kelvin plank and clausis statements of the second law of

thermodynamics and establish equivalence between them.

b) Determine the power required to run a refrigerator that transfer 1500 KJ/min of heat

from a cooled space at 10ºC to the surrounding atmosphere at 32ºC. And also

calculate the maximum work and irreversibility.

OR

7) a) Define and explain the terms availability, unavailability and irreversibility based on

the quality of energy.

b) An electric current of 13 amp is maintained for 1.1s in a resistor of 30 ohms, which is

kept immersed in a large pool of water. The temperature of the resistor and water

remain constant at 39ºC and 28ºC, respectively.

Calculate the entropy change for

i) Resistor

ii) Water

iii) Universe

Is the process reversible or irreversible?

UNIT - IV

8) a) Show that thermal efficiency of Ottocycle is equivalent to the efficiency of Brayton

cycle for the same compression process.

b) A diesel engine has a compression ratio of 15 and the heat addition process is at

constant pressure takes place and the cut off takes at 6% of stroke. Find the air

standard efficiency and mean effective pressure.

OR

9) a) Explain T-S diagram for a pure substance.

b) Steam at 10 bar and 3000C passing through a convergent-divergent nozzle expands

reversibly and adiabatically till the pressure falls to 2 bar. If the velocity of the steam

entering into the nozzle is 50m/sec. Determine the exit velocity of the steam.

(DME 216)




Paper - VI : Material Science & Matallurgy




1) Write brief notes on:

a) What is the number of atoms per unit cell in the F.C.C.structure?

b) What is lever rule?

c) Write some applications of low carbon steels.

d) List out the advantages of gas carburising.

e) What are dielectric Ceremics?

f) Define powder metallurgy.

g) List out some examples of cermet.

UNIT - I

2) Write short notes on:

a) BCC crystal structure and its packing factor.

b) Binary equilibrium diagram construction using cooling curves.

OR

3) a) What is space lattice and list the possibilities of space lattices. Aluminium

crystallizes in F.C.C. structure with a lattice parameter of 0.405nm. Calculate the

radius of the Aluminium.

b) Explain the equilibrium diagram for two metals insoluble in the liquid state and solid

state with the aid of a sketch.

UNIT - II

4) a) Discuss about the manufacturing procedure, properties and applications of

i) Greycast iron

ii) S.G.iron.

b) Explain the different types of annealing treatments and their objectives. Explain the

theory of tempering. What are the effects of Tempering on the mechanical properties

of steels.

OR

5) a) With the aid of a sketch explain Fe-Fe3C equilibrium diagram.

b) Distinguish between

i) Annealing and tempering.

ii) Martempering and Tempering.

UNIT - III

6) a) Explain the following:

i) Induction hardening.

ii) Flame hardening.

b) What is composite? What are the types of composites. Discuss in brief about each of them.

OR

7) a) Explain the cyaniding process and list out its advantages, limitations and

applications.

b) Explain the various methods of manufacturing used for composites.

UNIT - IV

8) a) Name some unique components which can be manufactured only by powder

metallurgy. Describe the manufacture of any two such components in detail.

b) What are bronzes? How are they classified? Give the composition microstructure,

properties and applications of any three of them.

OR

9) a) Explain in detail about sintering.

b) Explain metal and organic coatings? Give detail about cathodic protection against corrosion.

(DME 217)




Paper - VII : Machine Drawing


Answer one question for each unit (15)

All Questions carry equal marks (4×15 = 60)

UNIT – I

1) Draw Knuckle thread, Acme thread and Buttress thread.

OR

2) Draw any three types of bolts with standard dimensions.

UNIT - II

3) Draw the half sectional view from the front view of the flange coupling to connect to two shafts of 25mm diameter.

OR

4) Draw any three types of keys.

UNIT - III

5) Assemble all parts of stuffing box. Draw the assembled views.

OR

6) Prepare the part drawing by giving two views of the following plummer block

(DME 221)




Paper - I : Engineering Mathematics - IV



Answer One question from each unit (4×15 = 60)

1) a) Write initial and Boundary conditions of the wave equation.

b) What are possible solutions of Heat equation?

c) Evaluate dz, where C is |z| = 3.

d) Define Cauchy Riemann equations in both cartesian and polar coordinates.

e) Expand f(z) = in |z| > 2.

f) Find the Nature and Location of the singularities of f(z) = .

g) Find Image of |z| = 2 under w = z + 3 + 2i.

h) Find poles of the function f(z) = .

UNIT - I

2) A tightly stretched string of Length l, with fixed ends is initially in equilibrium position. It

is set vibrating by giving each point a velocity Vo.sin . Find the displacement y(x, t).

OR

3) The function v(x, y) satisfies the Laplace’s equation in rectangular coordinates (x, y) and

for points with in the rectangle x = 0, x = a, y = 0, y = b, it satisfies the conditions v(0, y) =

v(a, y) = v(x, b) = 0 and v(x, 0) = x (a-x) where 0 < x < a. Show that v(x, y) is given by

v(x, y) = 3

0

( )sin(2 1) sin (2 1)

.(2 1) sin (2 1)n

x b yn h n

a abn h n

a

π π

π∞

=

−+ +⋅

+ +∑

UNIT - II

4) a) Find the analytic function, whose real part is .

b) If f(z) is a regular function of z, prove that |f(3)|2 = 4 | f ′ (z)|2.

OR

5) a) Evaluate ( )22 2

z

c

edz

z π+∫ , where C is |z| = 4.

b) Find the sum of Residues of f(z) = at its poles inside the circle |z|=2.

UNIT - III

6) a) Find Taylor series expansion of f(z) = about the point z = i.

b) Find the sum of Residues of f(z) = at its poles inside the circle |z|=2

OR

7) Show that P 1

0

,0 P 11 sin P

xdx

x x

π∞ −

= < <+∫ .

UNIT - IV

8) a) Under the transformation w= , find the image of |z-2i| = 2.

b) Write about the transformation w = cos hz.

OR

9) a) Explain about the transformation w=z2.

b) Prove that the transformation w=sinz, maps the families of lines x = constant and y =

constant into two families of confocal central conics.

(DME 222)

B.Tech. DEGREE EXAMINATION, NOV./DEC. - 2014


MECHANICAL ENGINEERING Paper – II: Advanced Mechanics of Materials

Time : 3 Hours Maximum Marks : 75

Answer question No.1 is compulsory (15)

Answer one question from each unit (4x15=60)

1) a) Explain stress strain diagram for ductile material.

b) Explain the significance of Mohr’s Circle and its uses.

c) What is the relationship between shear force and bending moment at a section.

d) What is indeterminate beam.

e) Explain the principles of virtual work.

UNIT-I

2) A steel bolt of 5 cm2 in area passes inside a coppertube 12 cm2 in area and has a nut at the

other end. The length of the unit is 40 cm and the pitch of the bolt threads is 3 mm. Find

the stress produced for 1/8th turn of the nut. Esteel = 210 GN/m2 and Ew = 110 GN/m2. Find

the change in the above stresses if a tensile force of 20 kN is applied to the ends of the

bolt.

OR

3) A hammer weighing 100 N falls 1.25m on a 5 cm cube iron block before coming to rest.

Find the distance the block will be compressed and the instantaneous stress induced in it.

Also determine the velocity with which the hammer will strike the block. E = 200 GPa.

UNIT-II

4) Write expressions for the relations between

a) i) Modulus of elasticity and shear modulus.

ii) Modulus of elasticity and bulk modulus and hence derive the relation among the three elastic constants.

b) A hollow shaft of diameter ratio 3/5 is required to transmit 800 kW at 110 r.p.m., the

maximum torque being 20% greater than the mean. The shear stress is not to exceed

63 MPa and the twist in a length of 3mm is not to exceed 1.4 degrees. Calculate the

minimum external diameter satisfying these conditions.

OR 5) a) At a point in a material there are two direct stresses of 80 MPa tensile and 60 MPa

compressive acting at right angles to each other. The greatest principle stress in the

material is limited to 125 MPa in tension. To what shearing stress may the material

may be subjected on the given planes and what will then be the maximum shearing

stress at the point.

b) A cylinder is 3cm long, 0.75 m in diameter and 12.5 mm thick at atmospheric

pressure. Calculate the dimensions when subjected to an internal pressure of 1.5

MPa. What is then the maximum shear stress in the shell. Assume E = 210 GPa; =

0.25.

UNIT-III

6) Draw the shearforce and bending moment diagrams for the beam shown in figure below.

Indicate the numerical values at all the important sections.

OR

7) A simply supported beam carries inclined loads of 1 kN, 2 kN and 3kN inclined at 30o, 45o

and 60o to the vertical as shown in fig. below. The loads act at 1m, 2m and 3m from the

left support respectively. If the span is 4m, draw the bending movement and shear force

diagrams and calculate their values under the loads.

UNIT-IV

8) Locate the shear centre of the cross section shown in fig. below.

OR

9) a) A beam of I-section 50 cm deep and 20 cm wide, has equal flanges 2 cm thick and

web 1cm thick. It carries at a cross section a shear force of 200kN. Determine the

shear stress distribution in the beam and the ratio of maximum shear to mean shear.

b) A bar of 100 cm in length is subjected to an axial pull such that the maximum stress

is equal to 150 MPa. Its area of cross section is 2 cm2 over a length of 95 cm and for

the middle 5 cm length; it is only 1cm2. If E = 200 GPa, calculate the strain energy

stored in the bar.

E E E

(DME 223)



MECHANICAL ENGINEERING Paper – III : Electrical Technology


Question No.1 is compulsory (15)


1) a) Define Kirchoff’s voltage law.

b) What is RMS value.

c) Define coil pitch.

d) What are the two types of pole construction?

e) What is the purpose of starter?

f) What is regulation?

g) What parameters can be obtained from OC test?

h) Define slip.

i) Write emf equation of synchronous machine.

j) What is accuracy?

k) What are the advantages of moving coil instrument?

l) What is electric traction?

m) Draw speed time characteristics?

n) Write the expression for torque produced in DC machine.

o) What are the disadvantages of three point starter?

UNIT-I

2) a) Determine the current through 8 ohm resistor by writing mesh equations and solving

them.

b) Define and explain Kirchoff’s laws. Also prove them by taking an example of simple

circuit.

OR

3) Enumerate all the parts of a DC machine. Indicate their functions and state the materials of

each part.

UNIT-II

4) a) Explain the principle of operation of a three point starter with the help of neat

diagram.

b) A long shunt compound motor takes a current of 24 A from 240 V mains. Determine

the overall efficiency if the resistances of armature, series field and shunt field are

0.1Ω, 0.08Ω and 60 ohms respectively and stray losses are 628 W.

OR

5) a) Develop the equivalent circuit of a 1-ø transformer.

b) Find the primary and secondary turns of a 3300/300v, 1- ø, 50 Hz, 30 kVA

transformer if the flux in the core is to be about 0.06 Wb. Also determine the primary

and secondary currents if the losses are to be neglected.

UNIT-III

6) Discuss the methods of starting the single phase induction motors in detail.

OR

7) Describe the constructional features of cylindrical rotor and salient pole attenuators in

detail.

UNIT-IV

8) a) Discuss the principle and operation of Dynamometer wattmeter.

b) What are the advantages, disadvantages of MI instruments?

OR

9) Explain briefly the principles of resistance and induction heating.

E E E

(DME 224)



MECHANICAL ENGINEERING Paper – IV: Computer Based Numerical Methods


Answer question No.1 is compulsory [15]

Answer one question from each unit [4x15=60]

1) Write a short notes on:

a) Gauss Seidal iterative method.

b) Regula Falsi method.

c) Simpson’s 3/8 Rule.

d) Prove 1- E.

e) Euler’s method.

UNIT-I

2) a) Find the positive root of x4 – x3 + 2x2 – x = 10 correct to three decimal places, using

Newton – Raphson method.

b) Apply Gauss elimination method to solve the equation 4x + 5y – 3z = -15, 2x + 3y -6z

= -12, 3x – y – z = 4.

OR

3) Explain the bisection method, iteration method and finite differences.

UNIT-II

4) Explain Gauss forward interpolation formula in detail.

OR 5) Find the missing term in the following table using interpolation.

X: 1 2 4 5 6

Y: 14 15 5 - 9

UNIT-III

6) a) Evaluate 6

20 1

dx

x+∫ by using Simpson’s 1

3 rule.

b) Explain Newton’s forward and backward differences to compute derivatives.

OR

7) Describe linear homogeneous linear difference equations with constant coefficients.

UNIT-IV

8) Explain Euler’s method and Runge Kutta methods.

OR

9) Solve the following by Euler’s modified method log ( ), (0) 2dy

x y ydx

= + = at x =1.2 and 1.4

with h = 0.2.

E E E

(DME 225)



MECHANICAL ENGINEERING Paper – V: Applied Thermodynamics




1) a) Limitations of Rankine cycle.

b) Functions of Wilcox boiler.

c) Different types of Nozzles.

d) What is compounding?

e) Applications of single stage compressor.

f) What are the processes involved in Carnot cycle?

g) Differentiate between absolute and relative humidity.

UNIT-I

2) What are the various methods of improving performance of a Rankine cycle? Explain

reheat cycle with help of neat sketches of lay out and T – S diagrams. Derive the

expression for efficiency of reheat cycle and compare with Rankine cycle.

OR

3) a) What are the factors that affect the boilers efficiency?

b) A boiler is provided with a chimney of 24 m height. The ambient temperature is

25oC. The temperature of flue gases passing through the chimney is 300oC. If the air

flow through the combustion chamber is 20 kg/kg of fuel burnt, find

i) The theoretical draught in cm of water and

ii) Velocity of flue gases passing through the chimney if 50% of the theoretical

draught is lost in friction at gate and passages.

UNIT-II

4) a) Define critical pressure ratio of a nozzle and discuss why attainment of sonic velocity

determines the maximum mass rate of flow through steam nozzle.

b) Steam expands isentropically from the state of 8 bar and 250oC to 1.5 bar in a

convergent – divergent nozzle. The steam flow rate is 0.75 kg/s. Find the velocity of

steam at exit from the nozzle and the exit area of nozzle. Neglect the inlet velocity of

steam.

OR

5) In an impulse turbine, mean diameter of blades is 1.05m and the speed is 3000 rpm. The

nozzle angle is 180o, the ratio of blade speed to steam speed is 0.42 and blade velocity

coefficient is 0.85. The outlet blade angle is 30 less than that of the inlet blade angle.

Steam flow rate is 20 kg/sec. Obtain

a) Tangential thrust on blades.

b) Axial thrust on blades.

c) Resultant thrust.

d) Power development.

e) Blade efficiency.

UNIT-III

6) a) With a neat sketch explain working of evaporative condenser.

b) What are the various sources of air leakage into the condenser? State the effects of air

leakage.

OR

7) In a gas turbine cycle, the pressure ratio is 6 and maximum cycle temperature is 650oC.

The efficiencies turbine and compressors are 0.85 and 0.82. Air enters the compressor at

15oC and flow rate of air is 12 kg/sec. For compression process, Cp = 1.005 kJ/kg-K; =

1.32. For combustion process, Cp = 1.11 kJ/kg.K. Determine:

a) Power developed

b) Thermal efficiency

c) Work ratio

UNIT-IV

8) a) Explain with neat sketch the working of vapour compression refrigeration cycle.

b) A heat pump is used to maintain an auditorium hall at 23oC when the atmospheric

temperature is -6oC. The heat load is 2300 kJ/min. Calculate the power required to

run the actual heat pump if the cop of the actual heat pump is 25% of the Carnot heat

pump working between the same temperature limits.

OR

9) Atmospheric air with barometric pressure of 1.013 bar has 38oC dry bulb temperature and

28oC wet bulb temperature. Determine

a) Humidity ratio

b) Relative humidity

c) Dew point temperature.

E E E

(DME 226)



MECHANICAL ENGINEERING Paper – VI: Casting, Forming and Welding Technology




1) Write a short note on the following:

a) List types of pattern materials.

b) Pattern allowance.

c) What is mean by Gating System.

d) Shell moulding.

e) List casting defects.

f) LBM.

g) What is an electrode?

h) Brazing.

i) List safety equipments while welding.

j) Weldability.

k) Example of sheet metal products?

l) Blanking.

m) Sheet Metal Tools.

n) Clearance.

o) Spring back effect.

UNIT-I

2) Define pattern. Explain any five different types of patterns with sketch.

OR

3) a) What is a mould? Explain about different moulding materials.

b) What are different types of cores used in casting?

UNIT-II

4) With neat sketch explain the cupola operation.

OR

5) a) Explain the processes of Investment casting process.

b) Explain the centrifugal casting and its advantages.

UNIT-III

6) Define welding. Explain the different types of resistant welding processes.

OR

7) a) What are the difficulties encountered with different weld positions.

b) Which welding process is used for welding railway track cracks? How?

UNIT-IV

8) a) Explain different types of extrusion processes.

b) With neat sketch explain about spinning, coining and embossing.

OR

9) a) Differences between punching and blanking operations.

b) Explain about explosive forming.

E E E

(DEC227/DME227/DCE227)

B.Tech. DEGREE EXAMINATION, NOV./ DEC. 2014


ELEC & COMMU and MECHANICAL and CIVIL ENGINEERING

Paper - VII : Environmental Science



Answer one questions from each unit (4×15=60)

1) Write briefly on:

a) Vermi composting.

b) Green Revolution.

c) Rain water harvesting.

d) Bhopal Gas Tragedy

e) Soil Erosion

f) Ground water depletion

g) Acid rain

h) Ozone Depletion

i) Water logging

j) Land Degradation

k) Flood

l) Thermal Pollution.

m) Drought

n) Water related diseases

o) Salinity

UNIT - I

2) Discuss in detail about in-situ and ex-situ conservation of biodiversity.

(OR)

3) a) Write importance of education on environmental issues.

b) Explain need for students from all courses to be aware of environmental issues.

UNIT – II

4) Discuss in detail about nuclear hazards and thermal pollution

(OR)

5) Write note on air prevention and control of pollution and water prevention and

control of pollution.

UNIT - III

6) Write a detailed explanation about local polluted site of your choice.

(OR)

7) What control measures be taken to develop unsustainable to sustainable

development?

UNIT - IV

8) Discuss the constitution, duties and powers of the Wild Life Advisory Board

under the provisions of the Wild Life Protection Act, 1972.

(OR)

9) Discuss the salient features of the Environment Act, 1986.

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