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ECE :: Automatic Control Systems

  1. A compensator has its pole and zero as shown in the given figure

  2. A.
    lag compensator
    B.
    lead compensator
    C.
    lead-lag compensator
    D.
    series compensator

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  3. For a stable system having two or more gain crossover frequencies the phase margin is measured

  4. A.
    at lowest gain crossover frequency
    B.
    at highest gain crossover frequency
    C.
    at the gain crossover frequencies
    D.
    none of the above

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  5. In a second order system, peak overshoot is independent of

  6. A.
    damping factor
    B.
    natural frequency
    C.
    both damping factor and natural frequency
    D.
    neither damping factor nor natural frequency

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  7. Nyquist plot provides information about absolute stability as well as relative stability.

  8. A.
    True
    B.
    False

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  9. Power handling capacity of wire wound potentiometer used in control systems is about

  10. A.
    0.1 W
    B.
    5 W
    C.
    25 W
    D.
    100 W

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  11. The Nyquist plot in the given figure is for G(s) H(s) =

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  13. For a factor the log

  14. A.
    is a straight line with slope 20 dB/decade
    B.
    is a straight line with slope 0 dB/decade
    C.
    is a straight line with slope - 20 dB/decade
    D.
    is a straight line with slope - 40 dB/decade

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  15. The number of stator field windings in an ac tachometer are

  16. A.
    1
    B.
    2
    C.
    3
    D.
    4

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  17. The radius of constant N circle for N = 1 is

  18. A.
    2
    B.
    2
    C.
    1
    D.

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  19. In using Nyquist stability criterion it is not necessary to determine closed loop poles.

  20. A.
    True
    B.
    False

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