Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 4th Sem New 2142004 Engineering Thermodynamics Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV (NEW) EXAMINATION ? WINTER 2018
Subject Code:2142004 Date:10/12/2018
Subject Name:Engineering Thermodynamics
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.
MARKS
Q.1 (a) Define following terms: (1) Isolated system, (2) Intensive property
(3) Extensive property
03
(b) Explain Quasi-static Process with diagram. 04
(c) Prove the equivalency of Kelvin-Plank and Clausius statements.
07
Q.2 (a) Explain what is meant by PMM1.Why is such a device not possible? 03
(b) What do you mean by Thermal equilibrium? Explain it with suitable
examples.
04
(c) Write steady flow energy equation in case of diffuser, boiler, turbine,
nozzle, pump, heat exchanger and condenser.
07
OR
(c) Derive expression for air standard efficiency of diesel cycle. 07
Q.3 (a) Explain. Discuss limitations of first law of thermodynamics. 03
(b) Define Entropy and show that it is a property of the system. 04
(c) Write note on reversibility and irreversibility. 07
OR
Q.3 (a) Give statements for second law of thermodynamics. 03
(b) State and prove Carnot's theorem. 04
(c) Explain briefly Otto cycle with help of p-v and T-s diagram and
derive an expression for ideal efficiency of Otto cycle.
07
Q.4 (a) What do you understand by Joule-Thomson coefficient? 03
(b) Derive the two T- ds equation starting from the basics. 04
(c) A heat engine is operated between 700
o
C and 30
o
C. It drive a heat
pump which works between 100
o
C and 30
o
C. Efficiency and COP
of the heat engine and the heat pump are half of that of corresponding
Carnot values. Calculate amount of heat rejected by heat pump at
100
o
C when 100 KJ is absorbed by heat engine at 700
o
C.
07
OR
Q.4 (a) Explain Zeroth law of thermodynamic. 03
(b) Write comparison of Carnot and Rankine cycle. 04
(c) Compare otto, diesel and dual cycle for
(1) Constant maximum pressure and heat input.
(2) Same maximum pressure and temperature.
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV (NEW) EXAMINATION ? WINTER 2018
Subject Code:2142004 Date:10/12/2018
Subject Name:Engineering Thermodynamics
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.
MARKS
Q.1 (a) Define following terms: (1) Isolated system, (2) Intensive property
(3) Extensive property
03
(b) Explain Quasi-static Process with diagram. 04
(c) Prove the equivalency of Kelvin-Plank and Clausius statements.
07
Q.2 (a) Explain what is meant by PMM1.Why is such a device not possible? 03
(b) What do you mean by Thermal equilibrium? Explain it with suitable
examples.
04
(c) Write steady flow energy equation in case of diffuser, boiler, turbine,
nozzle, pump, heat exchanger and condenser.
07
OR
(c) Derive expression for air standard efficiency of diesel cycle. 07
Q.3 (a) Explain. Discuss limitations of first law of thermodynamics. 03
(b) Define Entropy and show that it is a property of the system. 04
(c) Write note on reversibility and irreversibility. 07
OR
Q.3 (a) Give statements for second law of thermodynamics. 03
(b) State and prove Carnot's theorem. 04
(c) Explain briefly Otto cycle with help of p-v and T-s diagram and
derive an expression for ideal efficiency of Otto cycle.
07
Q.4 (a) What do you understand by Joule-Thomson coefficient? 03
(b) Derive the two T- ds equation starting from the basics. 04
(c) A heat engine is operated between 700
o
C and 30
o
C. It drive a heat
pump which works between 100
o
C and 30
o
C. Efficiency and COP
of the heat engine and the heat pump are half of that of corresponding
Carnot values. Calculate amount of heat rejected by heat pump at
100
o
C when 100 KJ is absorbed by heat engine at 700
o
C.
07
OR
Q.4 (a) Explain Zeroth law of thermodynamic. 03
(b) Write comparison of Carnot and Rankine cycle. 04
(c) Compare otto, diesel and dual cycle for
(1) Constant maximum pressure and heat input.
(2) Same maximum pressure and temperature.
07
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2
Q.5 (a) State and explain law of corresponding states. 03
(b) State and explain Dalton?s law of partial pressure . 04
(c) In an air standard Otto cycle, the maximum and minimum
temperatures are 1600
o
C and 20
o
C. The heat supplied per kg of air
is 900 kJ. Determine the compression ratio, the cycle efficiency and
the ratio of maximum to minimum pressure in the cycle. Take Cv =
0.718 kJ/kg K and ? = 1.4
07
OR
Q.5 (a) Define heat engine. Also explain the need for a sink in a heat engine. 03
(b) State and explain Avogadro?s law 04
(c) In an ideal Diesel cycle, the temperature at the beginning and at the
end of compression are 57
o
C and 603
o
C respectively. The
temperature at the beginning and end of expansion are 1950
o
C and
870
o
C respectively. Determine the ideal efficiency of the cycle. If
the pressure at the beginning is 1bar, calculate the maximum
pressure in the cycle.
07
************
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This post was last modified on 20 February 2020