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ECE :: Automatic Control Systems

  1. The first column of a Routh array is

    How many roots of the corresponding characteristic equation are in left half s-plane?

  2. A.
    2
    B.
    3
    C.
    4
    D.
    5

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  3. For the given figure, time constant RC = t. Then

  4. A.
    t2s2 + 2ts + 1
    B.
    C.
    ts2 + 1
    D.

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  5. The entries in the first column of Routh array of a fourth order are 5, 2, - 0.1, 2, 1. The number of poles in the right half plane are

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

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  7. In Bode diagram (log magnitude plot) the factor (jω)n in the transfer function gives a line having slope

  8. A.
    20 dB/decade
    B.
    20n dB/decade
    C.
    D.
    -20n dB/decade

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  9. The magnitude of transport lag factor is always zero.

  10. A.
    True
    B.
    False

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  11. The primary function of lag compensator is to provide sufficient

  12. A.
    gain margin
    B.
    phase margin
    C.
    both gain margin and phase margin
    D.
    either (a) or (b)

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  13. In the given figure, C(s) =

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  15. For G(jω) =

  16. A.
    magnitude is 1 at all frequencies and phase angle varies from 0 to - 180° as ω varies from 0 to ∞
    B.
    magnitude is T at all frequencies and phase angle 0
    C.
    magnitude is (1 + ω2T2)0.5 and phase angle varies from0 to 0 - 180° as ω varies from 0 to ∞
    D.
    none of the above

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  17. The transient response of a second order system is given by for 5% criterion the settling time is

  18. A.
    0.25 sec
    B.
    0.75 sec
    C.
    1.25 sec
    D.
    4 sec

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  19. The polar plot of a transfer function passes through (-1, 0) point. The gain margin is

  20. A.
    zero
    B.
    - 1 dB
    C.
    1 dB
    D.
    infinity

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