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.(ANE) (Sem.?4)
AIRCRAFT PROPULSION ? I
Subject Code : ANE-208
M.Code : 60516
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 :
2?10=20
a. What are the parameters which influences heat conduction/ heat convection?
b. What is thermal conductivity?
c. Can thermal conductivity be negative? Justify your answer.
d. Define Prandtl number.
e. Define activity factor.
f. What is the difference between S.I engine and C.I engine?
g. What is break horse power?
h. Which thermodynamic cycle does a gas turbine engine follow?
i. What limits the usage of propeller aircrafts at sonic speeds and above?
j. Although combustion inside a realistic diesel cycle is non-isobaric, it is considered to
be isobaric in ideal cycle. Why?
1 | M-60516
(S2)-2408
SECTION-B
2)
Two infinite black plates at 500?C and 100?C exchange heat by radiation. Calculate the
heat- transfer rate per unit area. If another perfectly black plate is placed between the 500
and 100?C plates, what is the percentage reduction in the heat transfer? What is the
temperature of the center plate?
[2+1+2]
3)
Obtain a relation for efficiency of an air-standard Diesel cycle.
[5]
4)
While performing static tests, a compressor is operating at pressure ratio of 4 and
isentropic efficiency of 0.85, find the compressor exit temperature if the temperature of
the incoming air is 288K. What is the power required by this compressor if the mass flow
is 10kg/S?
[5]
5)
Through Blade Element Theory, obtain a relation for lift over a helicopter blade.
[5]
6)
Mention the property variation across an oblique shock on a neat diagram.
[5]
SECTION-C
7)
Explain in detail the complete operation of lubrication system of an aircraft piston
engines.
[10]
8)
Explain in detail the working of ignition system of a multi-cylinder aircraft piston
engines.
[10]
9)
Obtain a relation for efficiency of a turbine following a polytropic process.
[10]
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.
2 | M-60516
(S2)-2408
This post was last modified on 04 November 2019