Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 4th Sem New 2140502 Chemical Engineering Thermodynamics I Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2140502 Date:17/05/2019
Subject Name: Chemical Engineering Thermodynamics - I
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Derive the expressions for First law of Thermodynamics for non-flow
process.
03
(b) Starting from the definition of primary thermodynamics properties, derive
Maxwell?s equations.
04
(c) Describe PVT behavior of pure substances using PV and PT diagrams. 07
Q.2 (a) Differentiate between:
(i) State function Vs Path function (ii) Reversible process Vs Irreversible
process (3) Closed and Open systems
03
(b) Discuss four different correlations to estimate latent heat of vaporization of
pure substances.
04
(c) An ideal gas initially at 1 bar and 298.15 K is compressed to 5 bar and 298.15
K by a two-step process: first isobaric cooling and then isochoric heating.
Calculate ?U, ?H, Q, W for each step considering heat capacities
independent of temperature, CV = 20.78 J/(mol K) and CP = 29.10 J/(mol
K). At 298.15 K and 1 bar the molar volume of the gas is 0.02479 m
3
/mol.
07
OR
(c) Derive equation of constants of Vander Waal?s equation of state in terms of
critical constants of a substance using condition at critical point in PV
diagram.
07
Q.3 (a) Discuss Virial equations and their applications. 03
(b) Define i) standard heat of formation ii) standard heat of combustion iii)
standard heat of reaction iv) latent heat
04
(c) Write a Short note on Claude process for gas liquefaction with neat
diagram.
07
OR
Q.3 (a) Give significance of Compressibility factor and volume expansivity. 03
(b) Discuss the Linde process for gas liquefaction. 04
(c) State and explain ?Two Parameter? theorem of generalized correlations for
gases.
07
Q.4 (a) Explain the concept of entropy. 03
(b) Explain working principle of a heat pump 04
(c) State and explain various statements of the second law of thermodynamics. 07
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2140502 Date:17/05/2019
Subject Name: Chemical Engineering Thermodynamics - I
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Derive the expressions for First law of Thermodynamics for non-flow
process.
03
(b) Starting from the definition of primary thermodynamics properties, derive
Maxwell?s equations.
04
(c) Describe PVT behavior of pure substances using PV and PT diagrams. 07
Q.2 (a) Differentiate between:
(i) State function Vs Path function (ii) Reversible process Vs Irreversible
process (3) Closed and Open systems
03
(b) Discuss four different correlations to estimate latent heat of vaporization of
pure substances.
04
(c) An ideal gas initially at 1 bar and 298.15 K is compressed to 5 bar and 298.15
K by a two-step process: first isobaric cooling and then isochoric heating.
Calculate ?U, ?H, Q, W for each step considering heat capacities
independent of temperature, CV = 20.78 J/(mol K) and CP = 29.10 J/(mol
K). At 298.15 K and 1 bar the molar volume of the gas is 0.02479 m
3
/mol.
07
OR
(c) Derive equation of constants of Vander Waal?s equation of state in terms of
critical constants of a substance using condition at critical point in PV
diagram.
07
Q.3 (a) Discuss Virial equations and their applications. 03
(b) Define i) standard heat of formation ii) standard heat of combustion iii)
standard heat of reaction iv) latent heat
04
(c) Write a Short note on Claude process for gas liquefaction with neat
diagram.
07
OR
Q.3 (a) Give significance of Compressibility factor and volume expansivity. 03
(b) Discuss the Linde process for gas liquefaction. 04
(c) State and explain ?Two Parameter? theorem of generalized correlations for
gases.
07
Q.4 (a) Explain the concept of entropy. 03
(b) Explain working principle of a heat pump 04
(c) State and explain various statements of the second law of thermodynamics. 07
2
OR
Q.4 (a) Discuss about thermodynamic diagrams. 03
(b) A block of copper at a temperature of 825 K and weighting 5 kg is dropped
into 50 kg water at 300 K. If there are no heat losses what is the change in
entropy of (a) copper, (b) water, and (c) copper and water both considered
together? Cp of copper is 0.4 kJ/kg K and that of water is 4.2 kJ/kg K.
04
(c) Calculate the standard heat of reaction of the methanol synthesis at 800
o
C.
CO(g) + 2H2(g) ?CH3OH(g). Consider standard heat of reaction at 298.15
K is -90135 J. CP/R =A+BT+CT
2
+DT
-2
J and T is in K.
Gas A B x 10
3
C x 10
6
D x 10
-5
CH3OH 2.211 12.216 -3.450 0.0
CO 3.376 0.557 0.0 -0.031
H2 3.249 0.422 0.0 0.083
07
Q.5 (a) Write short note on Choice of Refrigerant for Refrigeration 03
(b) Discuss thermodynamics fundamentals of compressors and ejectors in
brief.
04
(c) Using Maxwell?s equation prove that :
dH = Cp dT + V(1 ? ? T) dP
dS = Cp dT/T ? ? V dP.
Where ? = Volume expansivity.
07
OR
Q.5 (a) Define: sonic velocity, nozzle and Mach no. 03
(b) Describe absorption refrigeration cycle 04
(c) Write short note on vapor compression refrigeration cycle 07
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This post was last modified on 20 February 2020