Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 3rd Sem New 3130507 Chemical Engineering Thermodynamics I Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 3130507 Date: 30/11/2019
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) Write short note on ?Gibb?s phase rule ?. 03
(b) Distinguish between intensive and extensive properties with suitable
example.
04
(c) Explain the P-V-T behavior of pure fluids with the help of neat diagram. 07
Q.2 (a) Distinguish between state function and path function. 03
(b) Explain about principle of corresponding states. 04
(c) State first law of thermodynamics? Derive the expressions for 1
st
law of
thermodynamics for non-flow process.
07
OR
(c) Heat is transferred to10 kg of air which is initially at 100 kPa and 300 K
until its temperature reaches 600 K. Determine the change in internal
energy and change in enthalpy, amount of heat supplied and the work
done for a Constant volume process. Assume air as an ideal gas. Given
that: R=8.314 kJ / kmol K, Cp=29.099 kJ / kmol K, Cv =20.785 kJ / kmol
K and molecular weight of air =29
07
Q.3 (a) State various equations of state for real gases. 03
(b) Define the following
i. Sensible heat
ii. Latent heat
iii. Standard heat of combustion
iv. Standard heat of formation
04
(c) Explain about Van- Der-Waals equation of state. 07
OR
Q.3 (a)
Discuss Virial equations and their applications.
03
(b) Define the statements for the second law of thermodynamics
i. Clausius Statement
ii. Kelvin ? Planck Statement
04
(c) Discuss effect of temperature on heat of reaction and derive necessary
equation.
07
Q.4 (a) Write a short note on Third law of thermodynamics. 03
(b)
Describe absorption refrigeration cycle.
04
(c) Explain and prove Carnot ?s principle with neat sketch. 07
OR
Q.4 (a) Write a short note on Jet ejector. 03
(b) Using Maxwell ?s equation prove that :
dH = CpdT + V(1 ? ?T)dP
Where ? is coefficient of volume expansion
04
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 3130507 Date: 30/11/2019
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) Write short note on ?Gibb?s phase rule ?. 03
(b) Distinguish between intensive and extensive properties with suitable
example.
04
(c) Explain the P-V-T behavior of pure fluids with the help of neat diagram. 07
Q.2 (a) Distinguish between state function and path function. 03
(b) Explain about principle of corresponding states. 04
(c) State first law of thermodynamics? Derive the expressions for 1
st
law of
thermodynamics for non-flow process.
07
OR
(c) Heat is transferred to10 kg of air which is initially at 100 kPa and 300 K
until its temperature reaches 600 K. Determine the change in internal
energy and change in enthalpy, amount of heat supplied and the work
done for a Constant volume process. Assume air as an ideal gas. Given
that: R=8.314 kJ / kmol K, Cp=29.099 kJ / kmol K, Cv =20.785 kJ / kmol
K and molecular weight of air =29
07
Q.3 (a) State various equations of state for real gases. 03
(b) Define the following
i. Sensible heat
ii. Latent heat
iii. Standard heat of combustion
iv. Standard heat of formation
04
(c) Explain about Van- Der-Waals equation of state. 07
OR
Q.3 (a)
Discuss Virial equations and their applications.
03
(b) Define the statements for the second law of thermodynamics
i. Clausius Statement
ii. Kelvin ? Planck Statement
04
(c) Discuss effect of temperature on heat of reaction and derive necessary
equation.
07
Q.4 (a) Write a short note on Third law of thermodynamics. 03
(b)
Describe absorption refrigeration cycle.
04
(c) Explain and prove Carnot ?s principle with neat sketch. 07
OR
Q.4 (a) Write a short note on Jet ejector. 03
(b) Using Maxwell ?s equation prove that :
dH = CpdT + V(1 ? ?T)dP
Where ? is coefficient of volume expansion
04
2
(c) Derive the expression for change in entropy when an ideal gas changes
its state from (P
1
, V
1
, T
1
) to (P
2
, V
2
, T
2
) for following process-
1) Constant volume process.
2) Constant pressure process.
3) Isothermal process.
07
Q.5 (a) Assuming air is mixture of 21 % oxygen and 79% nitrogen by volume
calculate entropy of 1 kmol air relative to pure oxygen and nitrogen, all
at the same temperature and pressure.
03
(b) Discuss briefly about single and multistage compressors. 04
(c) What is the criterion of exactness? Using the criterion of exactness derive
the Maxwell equation.
07
OR
Q.5 (a) Discuss any three major desirable properties of good refrigerant. 03
(b) Write a short note on Thermodynamic Diagrams. 04
(c) A refrigeration machine operating at a condenser temperature at 290 K
needs 1 kW of power per ton of refrigeration.
Determine:
1) Coefficient Of Performance(COP)
2) Heat rejected to the condenser
3) The lowest temperature that can be maintained.
Given that: 1 Ton of refrigeration = 12660 kJ/h=3516.67 W
07
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This post was last modified on 20 February 2020