PTU B.Tech Aerospace Engineering 5th Semester May 2019 71838 CONTROL ENGINEERING Question Papers

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Roll No. | [ | [ [ ] [ [ ] Total No. of Pages : 02
Total No. of Questions : 09
B.Tech. (Aerospace Engineering) (2012 Onwards) (Sem.-5)
CONTROL ENGINEERING
Subject Code : ASPE-304

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INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.

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3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

1. Write briefly :
   1. Block representation of system elements
   2. Bode attenuation diagram
   3. Concept of automatic control

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   4. Proportional controller
   5. Phase margin
   6. Closed loop system
   7. Modern control theory
   8. Relative stability

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   9. Mason’s Gain formula
   10. Polar plot

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SECTION-B

2. Determine whether the characteristic equation given below has stable or unstable roots.(5)
   20 +4+40+12=0
3. How addition of poles and zeros affect the stability characteristics of a closed loop system? (5)

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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.
6. Write short notes on ‘M & N Circles’.

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

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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 Asp = =211 + 2.14i. Assume that the original short period dynamics are given as : (10)
   Aa] [-0334 1.0 Aol [-0.027
   . |= + [A8,]
   Ag =252 -0387||Aag | |26
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)

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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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