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ECE :: Automatic Control Systems

  1. For stable network the real parts of poles and zeros of driving point functions must be

  2. A.
    negative
    B.
    negative or zero
    C.
    zero
    D.
    positive

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  3. Consider the following expressions which indicate the step or impulse response of an initially relaxed system

    1. [5 - 4 e-2t] u(t)
    2. [e-2t + 5] u(t)
    3. d(t) + 8 e-2t u(t)
    4. d(t) + 4 e-2t u(t)
    Those which correspond to the step and impulse response of the same system include

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

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  5. If Z is the number of zeros of 1 + G(s) H(s) in the right half s plane. N is the number of clockwise encircle elements of (-1 + jo) point. P is the number of poles of G(s) H(s) in right half s plane. The Nyquist stability criterion can be expressed as

  6. A.
    Z = N + P
    B.
    Z = P/N
    C.
    Z = N - P
    D.
    Z = PN

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  7. The given figure shows a control system. The maximum value of gain for which the system is stable is

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

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  9. In a synchro transmitter

  10. A.
    input is angular position of rotor shaft and output is stator voltages
    B.
    input is stator voltages and output is angular position of shaft input is rotor voltage and output is angular position of rotor shaft
    C.
    input is rotor voltage and output is angular position of rotor shaft
    D.
    input is angular position of rotor shaft and output is rotor voltage

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  11. The polar plot of G(jω) = 1/jω is

  12. A.
    positive imaginary axis
    B.
    positive real axis
    C.
    negative imaginary axis
    D.
    negative real axis

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  13. The log magnitude for the system in the given figure is (where T = RC)

  14. A.
    20 log (1 + ωT)
    B.
    -20 log (1 + ωT)
    C.
    -10 log (1 + ω2T2)
    D.
    -20 log (1 + ω2T2)

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  15. For an unstable system the gain margin is indicative of how much the gain should be decreased to make the system stable.

  16. A.
    True
    B.
    False

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  17. In the signal flow graph of the given figure, the number of forward paths is

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

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