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c sr26B'E./B.Tech.DEGREEEXAMINATION, MAy/ruNE 2007

Fifth SemesterChemicalEngineering

CH 1301- CHEMICALENGINEERINGTHERMODYNAMICS I(Regulation2004)

Time : Threehours Maximum : 100marksAnswer ALL questions.PARTA- ( fO x2=2}marks )

1' Distinguish between state function and path function.2' Show that the law of conservationof energy is a consequence f the first law ofthermodynamics3' write the expression or work done n a polytropic process.4' Give the qualitative differencebetweenheat and other forms of energy5. state the clausius statement of the second aw of thermodynamics.6' show that a Carnot engine has the maximum efficiency and that the efficiencvis independentof the working fluid.7. write clausius-clapeyron equation and give its physical significance.B' What are the limiting conditions that should be satisfied by the equation ofstate in general?9' \trtrat are the different meLhocls y which the fugacity of pure gases can bedeternined?10. Ijefine Mach number.

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PARTB-(5xL6=80marks)11. (a) Explain the following

(i) Isobaric and polyhopic process.(ii) Intensive and extensive properties.(iii) Closedsystem and opensystem.(iv) Reversible and Irreversible processes.(v) Adiabatic and Isothermal process.

(b) (i)

L2. (a)using adiabatic process.

Discuss II Law of thermodynamics.

(ii)

(Or)Derive the frrst law of thermodynamics for a steady state flowprocess. (8 )A stationary mass of gas is compressed n a friction less way from2 Kg/c;m2and 0.1 m3 to 6 Kglcmz and 0.02 m3. Find the work done

(3)(3)(3)(4)(3)

(8)

(6)

(8 )

(i )(ii) A solid weighing 150 grams at 200'c and with a heat capacity

0.3zu/KgK is dropped into ?50 gm of water at 25"C. The heatcapacity of water is 4 KJ/Kg K. Calculate the change n entropy forwater, solid and total entropy change.Comment on the results. (10)

Or(b) (i) Explain the physical conceptof entropy. (4)

(ii) How do you calculate he lost work in an irreversible process? G)' (iii) Assume that 5000kglhr of oil with a heat capacityof 3.2 KJlI{g K is

to be cooled ftom. 220'c to 40"c using a large quantity of waterwhich can be assumed to be at a constant temperature of 30"C'Determine the lost work in the process and thermodynamicefficiency of the process.

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13. (a) Derive the following:

( i) d,(rc,d,r lr(*] -" loyy\o t )v l( i i ) d.H cPdr. [u - ,(* ' ] l r"L ( ar),l

T 2

aP)av ,

(ii)(iii)

Or

(5+6+5)

t b + c + D )

(b) Prove the following:

( i) cp -c, = p'vr

(iii)(#),=-'I14. (a ) (i )

(b) (i)

AU

(a'v\lw),Define the following:Compressibility factor, Tliple point, Critical properties. (G)Under what conditionsa real gasbehaves deally. (g)Write a brief note on the importance of studying the PVT behaviorof fluids. (7)

Show that Raoult's aw is valid for componentA of a binary solutionover the rErngeof composition for which Henry's law holds forcomponentB. (8)(ii) Gaseous nitrogen obeys the following relation at 100"C,

z =r + (2.11x 10r) P, where P is in atm. calculate the fugacity of(8)i trogen at 100'C and 100 atm.

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15' (a) Air at 600 K and 2000 KPa enters a convergent -divergent nozzlewhosethroat area is one half that of the d.ischarge of the divergent section.Assuming / = L. for air, determine the following.(i) The presstrre, emperature, velocity and density at the throat whenthe Mach number is 0.g at the throat.(ii) The critical pressurecorresponding o the reservoir condition. (16)

OrG) What is the effect of 'clearance' on the work required and theoreticalvolumetric efficiency of a murti stage adiabatic compressor? (16)

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