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ECE :: Automatic Control Systems

  1. A lead compensator is basically a

  2. A.
    high pass filter
    B.
    low pass filter
    C.
    band stop filter
    D.
    none of the above

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  3. In Bode diagram (log magnitude plot) of the factor 1/(1 + jωT) in the transfer function the log magnitude for ω << 1/T can be approximated by

  4. A.
    0 dB
    B.
    20 log ωT dB
    C.
    -20 log ωT dB
    D.
    none of the above

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  5. Assertion (A): The part of root locus on the real axis is not dependent on the poles and zeros which are not on the real axis.

    Reason (R): Poles and zeros which are not on the real axis occur in conjugate pairs

  6. 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

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  7. The phase angle of is constant and equal to - 90° for all values of ω

  8. A.
    True
    B.
    False

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  9. For underdamped second order systems the rise time is the time required for the response to rise from

  10. A.
    0% to 100% of its final value
    B.
    10% to 90% of its final value
    C.
    5% to 95% of its final value
    D.
    either (a) or (b)

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  11. The open loop frequency response of a unity feed back system is as under

    The gain margin and phase margin respectively are

  12. A.
    20 dB and 15°
    B.
    20 dB and 25°
    C.
    6 dB and 15°
    D.
    6 dB and 25°

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  13. Assertion (A): A large negative feedback is deliberately introduced in an amplifier to make its gain independent of variation in parameters of active device.

    Reason (R): A large negative value of feedback results in a high value of return difference compared to unity which makes the feedback gain inversely proportional to the feedback factor.

  14. 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

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  15. The transfer function can be for

  16. A.
    lead compensator
    B.
    lag compensator
    C.
    either (a) or (b)
    D.
    neither (a) nor (b)

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  17. In response to a unit step input the controller output in given figure is for

  18. A.
    proportional controller
    B.
    proportional plus integral controller
    C.
    integral controller
    D.
    none of the above

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  19. An electromechanical device which actuates a train of step angular movements in response to a train of input pulses on one to one basis is

  20. A.
    synchro control transformer
    B.
    LVDT
    C.
    stepper motor
    D.
    tacho generator

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