PTU Punjab Technical University B-Tech May 2019 Question Papers 4th Semester Aerospace Engineering
Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(Aerospace Engg.) (2012 Onwards) (Sem.?4)
AEROSPACE PROPULSION ? I
Subject Code : ASPE-207
M.Code : 71531
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1.
SECTION-A is COMPULSORY consisting of TEN questions carrying T WO marks
each.
2.
SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3.
SECTION-C contains T HREE questions carrying T EN marks each and students
have to attempt any T WO questions.
SECTION-A
1)
Answer briefly :
a. Name two types of gas turbine engines which primarily provides shaft power output.
b. Write trust equation for a jet engine which is operating at fully expanded nozzle
condition.
c. How is an isentropic flow different from an adiabatic flow?
d. Define total pressure.
e. Which thermodynamic cycle does a gas turbine works on?
f. Write the relation for isentropic efficiency of a compressor.
g. Which thrust augmentation is utilized during take-off in hot weather?
h. Name any 4 categories of rocket engine types based on propellants.
i. What is uninstalled thrust?
j. What is the maximum achievable exit Mach number in convergent nozzle?
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SECTION-B
2)
Obtain thrust equation for a rocket engine.
3)
Mention the property variation across an oblique shock on a neat diagram.
4)
For isentropic flow, obtain the relation for pressure ratio vs temperature ratio.
5)
Show that the least pressure ratio required across a nozzle to reach sonic speed is 1.89.
6)
Briefly explain about any two parameters affecting the takeoff thrust of an engine.
SECTION-C
7)
Classify aircraft engines based on their operational flight Mach no. and explain their
limitations.
8)
With neat diagram, explain the various configurations of solid propellant structures and
state their advantages.
9)
Explain the over expanded and under expanded rocket nozzle operating conditions with
help of a neat diagram.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 04 November 2019