Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 3rd Sem New 3130109 Thermodynamics For Aeronautical Engineering Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 3130109 Date: 30/11/2019
Subject Name: Thermodynamics for Aeronautical Engineering
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) Difference between extensive property and intensive property. 03
(b) Give the comparisons of microscopic and macroscopic point of
view of Thermodynamics.
04
(c) Derive an expression for efficiency of Diesel cycle in terms of the
compression ratio r, cut-off ? and ?.
07
Q.2 (a) Write steady flow energy equation in case of boiler, turbine and
condenser
03
(b) Prove that ?Energy is a property of a system?. 04
(c) In a gas turbine unit, the gas flow through the turbine is 15 Kg/Sec.
and the Power developed by the turbine is 12000 KW. The enthalpies
of gases at inlet and Outlet are 1260 KJ/Kg and 400 KJ/Kg
respectively, and the velocity of gases at the Inlet and outlet are 50
m/s and 110 m/s respectively. Calculate
(i) The rate at which Heat is rejected to the turbine, and
(ii) The area of the inlet pipe given that the Specific volume of
gases at inlet is 0.45 m
3
/kg.
07
OR
(c) Derive equation for (i) filling the tank and (ii) emptying the tank 07
Q.3 (a) Identify the reasons for the impracticality of Carnot cycle 03
(b) State and explain the Perpetual motion machines of Second Kind 04
(c) State Kelvin-Plank Statement of Second Law of thermodynamics
and show that violation of Kelvin-Plank statement leading to
violation of Clausius statement.
07
OR
Q.3 (a) Write the equation for entropy change of reversible and
irreversible process and cycles with usual notations.
03
(b) Explain: Entropy principle. 04
(c) Two Carnot engines work in series between the source and sink
temperatures of 550 K and 350 K. If both engines develop equal
power determine the intermediate temperature.
07
Q.4 (a) Draw the T-s diagram of ideal Rankine vapour power cycle
showing name of component for each process and write the
energy equation for each component neglecting kinetic and
potential energy
03
(b) Compare Otto, Diesel and Dual cycle for
i) Same compression ratio and heat supplied
ii) Same Max. Pressure and temperature
04
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 3130109 Date: 30/11/2019
Subject Name: Thermodynamics for Aeronautical Engineering
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) Difference between extensive property and intensive property. 03
(b) Give the comparisons of microscopic and macroscopic point of
view of Thermodynamics.
04
(c) Derive an expression for efficiency of Diesel cycle in terms of the
compression ratio r, cut-off ? and ?.
07
Q.2 (a) Write steady flow energy equation in case of boiler, turbine and
condenser
03
(b) Prove that ?Energy is a property of a system?. 04
(c) In a gas turbine unit, the gas flow through the turbine is 15 Kg/Sec.
and the Power developed by the turbine is 12000 KW. The enthalpies
of gases at inlet and Outlet are 1260 KJ/Kg and 400 KJ/Kg
respectively, and the velocity of gases at the Inlet and outlet are 50
m/s and 110 m/s respectively. Calculate
(i) The rate at which Heat is rejected to the turbine, and
(ii) The area of the inlet pipe given that the Specific volume of
gases at inlet is 0.45 m
3
/kg.
07
OR
(c) Derive equation for (i) filling the tank and (ii) emptying the tank 07
Q.3 (a) Identify the reasons for the impracticality of Carnot cycle 03
(b) State and explain the Perpetual motion machines of Second Kind 04
(c) State Kelvin-Plank Statement of Second Law of thermodynamics
and show that violation of Kelvin-Plank statement leading to
violation of Clausius statement.
07
OR
Q.3 (a) Write the equation for entropy change of reversible and
irreversible process and cycles with usual notations.
03
(b) Explain: Entropy principle. 04
(c) Two Carnot engines work in series between the source and sink
temperatures of 550 K and 350 K. If both engines develop equal
power determine the intermediate temperature.
07
Q.4 (a) Draw the T-s diagram of ideal Rankine vapour power cycle
showing name of component for each process and write the
energy equation for each component neglecting kinetic and
potential energy
03
(b) Compare Otto, Diesel and Dual cycle for
i) Same compression ratio and heat supplied
ii) Same Max. Pressure and temperature
04
2
(c)
A steam turbine power plant operating on ideal Rankine cycle,
receives steam at 20bar, 300
0
C at the rate of 3 Kg/S and it
exhausts at 0.1bar.
Calculate the followings:
i) Net power output
ii) Steam rate
iii) Heat rejection in condenser in KW
iv) Rankine Cycle efficiency.
07
OR
Q.4 (a) Write comparison of Carnot and Rankine cycle. 03
(b) Derive an air-standard efficiency expression for Brayton cycle in
terms of rp and ?
04
(c) In an IC Engine working with the Otto cycle, the cylinder
diameter is 250 mm and a stroke is 375mm. If the clearance
volume is 0.00263 m
3
, and the initial pressure and temperature are
1bar and 50
0
C, calculate the air standard efficiency and mean
effective pressure of the cycle. The maximum cycle pressure is
limited to 25bar.
07
Q.5 (a) Give causes of irreversibility in detail. 03
(b) Draw the brayton cycle diagram with ideal regeration, reheating
and intercooling. Also draw the T-s diagram.
04
(c) Derive Maxwell relations and various TdS equations. 07
OR
Q.5 (a) Explain in short: Exergy 03
(b) Define and Explain Helmholtz & Gib?s function 04
(c) Write down Jet engine components. Derive expression for
component efficiency of any one component
07
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This post was last modified on 20 February 2020