Download PTU B.Tech 2020 March Aero 6th Sem ANE 321 Automatic Flight Control Question Paper

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Roll No. Total No. of Pages : 03

Total No. of Questions : 09

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B.Tech. (ANE) (Sem.-6)

AUTOMATIC FLIGHT CONTROL

Subject Code : ANE-321

M.Code : 60530

Time : 3 Hrs. Max. Marks : 60

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

SECTION-A

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1. Answer briefly :
   1. Compare the merits and demerits of feedback control systems in comparison to open loop control systems.
   2. Write down the equation of operation for a PID controller.
   3. What is meant by frequency-response of a system?
   4. Define the transfer function of a control system.
   5. State the significance of root loci.

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   6. State the basic function of I.L.S.
   7. List the basic components of a pitch attitude control system.
   8. Plot the time response of a second order system.
   9. State the transient response parameters of a second order system.
   10. What is the purpose of a displacement type auto pilot?

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SECTION-B

2. For the control system shown in fig. 1, determine k1, k2 and a such that the system will have a steady state gain of 1.0, a damping ratio ? = 0.6 and a natural frequency, ? = 5.0.
   
   

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   Fig.1
3. The characteristic equation for a control system to control the output torque of an engine IS :
   S(S³+8S+a)+4(S+8)=0
   Use Routh’s criterion to obtain the range of values of a for which the system is stable.
4. For the system shown in fig. 2, write the characteristic equation and then determine the value of K such that ? = 3. What is the corresponding value of the damping ratio ?
   

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   Sketch the asymptotes of the log-magnitude plot for both the open-loop and closed-loop frequency response. Determine ? and M?.
   
   Fig.2
5. Explain with the help of a block diagram how the damping of the Dutch Roll is accomplished?

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6. Sketch the root locus plot for the system shown in fig. 3. Determine the value of K to yield a damping ratio of 0.5.
   
   Fig.3

SECTION-C

7. How will you carry out the design of an autopilot of longitudinal flight control of a conventional aircraft? State the procedure.

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8. What does fly-by-wire mean? How does it prevent unsafe operation of the aircraft outside of its performance envelope?
9. Write notes on :
   1. Acceleration control system
   2. Yaw Orientational Control System.

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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