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  • Question

  • In the given figure, if R = XC, voltage gain is
    In the given figure, if R = XC, voltage gain is 0 dB 3 dB -3 dB 20 dB If R = XC, V0 = 0.5 Vi Hence g


  • Options
  • A. 0 dB
  • B. 3 dB
  • C. -3 dB
  • D. 20 dB

  • Correct Answer
  • -3 dB 

    Explanation
    If R = XC, V0 = 0.5 Vi Hence gain is -3 dB.

    Automatic Control Systems problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. In the given figure the input is x(t) = A sin ?t. The steady state output y(t) =

    • 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. The phase margin and damping ratio have no relation.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. 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
    • 6. A unity feedback system has open loop transfer function The closed loop transfer function is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. For the transport lag G(j?) = e-j?T, the magnitude is always equal to

    • Options
    • A. 0
    • B. 1
    • C. 10
    • D. 0.5
      • Discuss

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