Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2017 Winter 3rd Sem Old 133401 Thermodynamics And Thermal Engineering Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?III (OLD) EXAMINATION ? WINTER 2017
Subject Code:133401 Date:14/11/2017
Subject Name: Thermodynamics and Thermal Engineering
Time: 10:30 AM to 01:00 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 of efficiency in Otto Cycle. 07
(b) Define Ideal and non-ideal gas. How they get differ with each other in their
behaviour? Explain the entropy change of an ideal gas.
07
Q.2 (a) Define the following :
(i) Emissivity
(ii) Stefan-Boltzmann Law
(iii) Wien?s Displacement Law
07
(b) Explain the various types of Heat Exchangers. 07
OR
(b) Describe briefly about the following processes :
(i) Sensible heating (ii) Cooling and dehumidification
07
Q.3 (a) Define entropy and irreversibility. Discuss their relationships. 07
(b) Explain the working of single stage reciprocating air compressor with a neat
sketch.
07
OR
Q.3 (a) Derive the equation for conduction of heat through a plane wall. 07
(b) Explain PVT behaviour of pure substances with the help of PT and PV diagrams. 07
Q.4 (a) Derive the equation for conduction of heat through a radial wall. 07
(b) Briefly explain the following
(i) Parallel-flow heat exchangers.
(ii) Counter-flow heat exchangers.
07
OR
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?III (OLD) EXAMINATION ? WINTER 2017
Subject Code:133401 Date:14/11/2017
Subject Name: Thermodynamics and Thermal Engineering
Time: 10:30 AM to 01:00 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 of efficiency in Otto Cycle. 07
(b) Define Ideal and non-ideal gas. How they get differ with each other in their
behaviour? Explain the entropy change of an ideal gas.
07
Q.2 (a) Define the following :
(i) Emissivity
(ii) Stefan-Boltzmann Law
(iii) Wien?s Displacement Law
07
(b) Explain the various types of Heat Exchangers. 07
OR
(b) Describe briefly about the following processes :
(i) Sensible heating (ii) Cooling and dehumidification
07
Q.3 (a) Define entropy and irreversibility. Discuss their relationships. 07
(b) Explain the working of single stage reciprocating air compressor with a neat
sketch.
07
OR
Q.3 (a) Derive the equation for conduction of heat through a plane wall. 07
(b) Explain PVT behaviour of pure substances with the help of PT and PV diagrams. 07
Q.4 (a) Derive the equation for conduction of heat through a radial wall. 07
(b) Briefly explain the following
(i) Parallel-flow heat exchangers.
(ii) Counter-flow heat exchangers.
07
OR
2
Q.4 (a) Write the comparison between vapour compression system and vapour
absorption system.
07
(b) Define the following terms :
(i) Dew point temperature (ii) Relative humidity (iii) Specific humidity.
07
Q.5 (a) Explain Fourier?s Law of Heat Conduction and Explain Thermal Resistance. 07
(b) Calculate the percentage loss in ideal efficiency of a diesel engine with
compression ratio 14, if the fuel cut-off is delayed from 5% to 8%.
07
OR
Q.5 (a) Compare the efficiency of Otto, diesel and dual cycle for same compression
ratio and heat rejection with help of p-v and T-S diagram.
07
(b) Write down the properties of refrigerant in detail. 07
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This post was last modified on 20 February 2020