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Automatic Control Systems problems

  • 1. A stepper motor is

  • Options
  • A. a two phase induction motor
  • B. is a kind of rotating amplifier
  • C. is an electromagnetic transducer used to convert an angular position of shaft into electrical signal
  • D. is an electromechanical device which actuates a train of step angular movements in response to a train of input pulses on one to one basis
    • Discuss
  • 2. The phase margin and damping ratio have no relation.

  • Options
  • A. True
  • B. False
    • Discuss
  • 3. In the given figure the input is x(t) = A sin ?t. The steady state output y(t) =
    Electronics and Communication Engineering Automatic Control Systems: In the given figure the input is x(t) = A sin ?t. The steady state output y<

  • Options
  • A. A sin (?t + ?) where ? = tan-1 |G(j?)|
  • B. |G(j?)| A sin [?t + ?G(j?)]
  • C. |G(j?)| A sin [2?t + ?G(j?)]
  • D. A G(j?) sin [?t + ?G(j?)]
    • Discuss
  • 4. In the given figure x6 =
    Electronics and Communication Engineering Automatic Control Systems: In the given figure x6 =

  • Options
  • A. de(ax1 + bx2 + cx3)
  • B. (a + b + c) (x1 + x2 + x3) (d + e)
  • C. (ax1 + bx2 + cx3) (d + e)
  • D. a b c d e (x1 + x2 + x3)
    • Discuss
  • 5. The system in the given figure, has
    Electronics and Communication Engineering Automatic Control Systems: The system in the given figure, has

  • Options
  • A. good gain and phase margin
  • B. poor gain and phase margin
  • C. good gain margin but poor phase margin
  • D. poor gain margin but good phase margin
    • Discuss
  • 6. In the given figure, if R = XC, voltage gain is
    Electronics and Communication Engineering Automatic Control Systems: In the given figure, if R = XC, voltage gain is

  • Options
  • A. 0 dB
  • B. 3 dB
  • C. -3 dB
  • D. 20 dB
    • Discuss
  • 7. A unity feedback system has open loop transfer functionElectronics and Communication Engineering Automatic Control Systems: A unity feedback system has open loop transfer function The closed loop transfer function is

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 8. The compensator of the given figure is a
    Electronics and Communication Engineering Automatic Control Systems: The compensator of the given figure is a

  • Options
  • A. lag compensator
  • B. lead compensator
  • C. lag-lead compensator
  • D. none of the above
    • Discuss
  • 9. From the noise point of view, bandwidth should

  • Options
  • A. be large
  • B. not be too large
  • C. should be as large as possible
  • D. should be infinite
    • Discuss
  • 10. Assertion (A): Potentiometers can not be used as error detectors in position control systems.

    Reason (R): The resolution of a potentiometer places an upper limit on its accuracy


  • Options
  • A. Both A and R are correct and R is correct explanation of A
  • B. Both A and R are correct but R is not correct explanation of A
  • C. A is correct but R is wrong
  • D. R is correct but A is wrong
    • Discuss

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