Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Summer 3rd Sem 3130109 Thermodynamics For Aeronautical Engineering Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER? III EXAMINATION ? SUMMER 2020
Subject Code: 3130109 Date:02/11/2020
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.
Marks
Q.1 (a) What do you understand by Vapour power cycles?
03
(b) What do you mean by Critical Point? Discuss.
04
(c) Explain Carnot Cycle and different processes with
07
schematic and Also represent it on a p-V and T-s
diagrams.
Q.2 (a) State and explain Gibbs-Dalton's law.
03
(b) How does regeneration affect the efficiency of a
04
Brayton cycle, and how does it accomplish it?
(c) Derive the general energy equation and reduce it for
07
steady flow energy equation. Apply the same for
boiler.
OR
(c) A domestic food freezer maintains a temperature of -
07
150C. The ambient air temperature is 300C. If heat
leaks into the freezer at the continuous rate of 1.75
kJ/s what is the least power necessary to pump this
heat our continuously?
Q.3 (a) Derive MAXWELL's equations.
03
(b) State the difference between Air-breathing engine
04
and Non-air breathing engine in jet propulsion.
(c) Express the overall efficiency of steam power plant
07
as the product of boiler, turbine, generator and cycle
efficiencies.
OR
Q.3 (a) List different components use in jet propulsion
03
engine in sequence.
(b)
Explain the followings:
04
1. Microscopic and macroscopic point of view
3. Intensive and extensive properties
(c) With the help of p-v and T-s diagram, show that for
07
the same maximum pressure and temperature of the
cycle and the same heat rejection, Diesel
>Dual>Otto.
Q.4 (a) State the principle of increase of entropy. List the four
03
application of entropy principle.
(b) What is the principal of jet propulsion?
04
(c) Derive the expression for efficiency and mean effective
07
pressure for diesel cycle.
OR
Q.4 (a) Compare Kelvin-Plank and Clausius statement of second
03
law of thermodynamics.
1
(b) Define a thermodynamic system. Differentiate
04
between open system, closed system and an isolated
system.
(c) With neat sketch explains Otto Cycle in detail also derive
07
expression for efficiency.
Q.5 (a) Prove that CP ? CV = R.
03
(b) An engine working on the Otto cycle is supplied with
04
air at 0.1 Mpa, 350C.The compression ratio is 8.Heat
supplied is 2100 kJ/kg. Calculate the cycle
efficiency.
(c) With neat sketch explain Brayton Cycle in detail.
07
OR
Q.5 (a) Write limitation of the first law of thermodynamics.
03
(b) With neat sketch show comparison Carnot and Rankine
04
cycle.
(c) A Carnot engine absorbs 200 J of heat from a
07
reservoir at the temperature of the normal boiling
point of water and rejects heat to reservoir at the
temperature of the triple point of water. Find the heat
rejected, the work done by the engine and the thermal
efficiency.
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This post was last modified on 04 March 2021