PTU Punjab Technical University B-Tech May 2019 Question Papers 5th Semester Aerospace Engineering
Total No. of Pages : 02
Total No. of Questions : 09
B.Tech. (Aerospace Engineering) (2012 Onwards) (Sem.?5)
CONTROL ENGINEERING
Subject Code : ASPE-304
M.Code : 71838
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.
Write briefly :
a) Block representation of system elements
b) Bode attenuation diagram
c) Concept of automatic control
d) Proportional controller
e) Phase margin
f) Closed loop system
g) Modern control theory
h) Relative stability
i) Mason's Gain formula
j) Polar plot
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SECTION-B
2.
Determine whether the characteristic equation given below has stable or unstable roots.(5)
23 + 42 + 4 + 12 = 0
3.
How addition of poles and zeros affect the stability characteristics of a closed loop
system?
(5)
4.
Illustrate the first order system response to step, ramp and impulse input with the help of
examples.
5.
Distinguish between `PI' and `PID' controllers.
(5)
6.
Write short notes on `M & N Circles'.
(5)
SECTION-C
7.
What do you mean by compensation? Explain Series and Feedback compensation.
Discuss the physical devices used for system compensation.
(2, 4, 4)
8.
An airplane is found to have poor short period flying qualities in a particular flight
regime. To improve the flying qualities, a stability augmentation system using state
feedback is to be employed. Determine the feedback gains so that the airplane's short
period characteristics are sp = ?2.1 2.14i. Assume that the original short period
dynamics are given as :
(10)
0.334 1.0
0.
027
[ ]
2.52
0.
387
2.
6
e
q
q
9.
What do you mean by transfer function and transfer function models? Explain the
transfer function models for mechanical and thermal systems with the help of examples.(4, 6)
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