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ECE :: Automatic Control Systems

  1. Consider following statements:

    1. Integral of absolute magnitude of error =
    2. Integral time-absolute error =
    3. Integral time-square error =
    Which of the above are correct?

  2. A.
    1 and 3
    B.
    1 only
    C.
    1 and 2
    D.
    2 and 3

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  3. Gain margin and phase margin can be determined from Bode plots as well as Nyquist plot.

  4. A.
    True
    B.
    False

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  5. The radius and centre of M circles are given by

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  7. For the system in the given figure the root locus

  8. A.
    is on real axis between points s = -1 and s = -3.6
    B.
    is on real axis between points s = 0 and s = -1
    C.
    is on real axis between points s = -3.6 and s = ∞
    D.
    is on real axis between points s = 0 and s = -3.6

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  9. For the factor (1 + 0.5 jω) the corner frequency is

  10. A.
    1 rad/sec
    B.
    0.5 rad/sec
    C.
    2 rad/sec
    D.
    0.25 rad/sec

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  11. If damping ratio is 0.5, the lines joining complex poles with origin are inclined to negative real axis at

  12. A.
    ± 90°
    B.
    ± 60°
    C.
    ± 45°
    D.
    ± 30°

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  13. At corner frequency the phase angle of factor is - 45°

  14. A.
    True
    B.
    False

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  15. A system has two poles as shown in the given figure. The zeros are at infinity. If input is unit step, the steady state output is

  16. A.
    B.
    C.
    D.
    1

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  17. A unity feedback system has the following open loop frequency response

    The gain margin and phase margin are

  18. A.
    0 dB, -17°
    B.
    3.86 dB, -180°
    C.
    0 dB, 10°
    D.
    3.86 dB, 10°

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  19. The permanent magnet field system of brushless dc servo- motor is generally on

  20. A.
    stator
    B.
    rotor
    C.
    partly on stator and partly on rotor
    D.
    either (a) or (b)

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