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ECE :: Automatic Control Systems

  1. Examine the following statements

    1. Air and gases are compressible.
    2. Air, gases and some liquids are compressible.
    3. Oil can function as hydraulic fluid as well as lubricator.
    Which of the above statements are correct?

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

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  3. Which control action is also called rate control?

  4. A.
    Proportional
    B.
    Derivative
    C.
    Integral
    D.
    Proportional plus integral

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  5. The gain margin for a stable system

  6. A.
    has a positive decibel value
    B.
    has a negative decibel value
    C.
    has a large negative decibel value
    D.
    none of the above

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  7. The signal flow graph of a system is shown in the given figure. The effect of disturbance TD can be reduced by

  8. A.
    increasing G2 (s)
    B.
    decreasing G2 (s)
    C.
    increasing G1 (s)
    D.
    decreasing G1 (s)

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  9. For overdamped systems a quadratic factor in transfer function can be replaced by two first order factors with real poles

  10. A.
    True
    B.
    False

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  11. A motor is coupled to a load through gear ratio n. If T is the motor torque, Jm and JL are moment of inertia of rotor and load, then torque to inertia ratio referred to motor shaft is

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  13. Accurate amplitude measurements can be made more easily than accurate phase shift measurements.

  14. A.
    True
    B.
    False

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  15. A synchro transmitter receiver unit is a

  16. A.
    two phase ac device
    B.
    3 phase ac device
    C.
    dc device
    D.
    1 phase ac device

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  17. The transfer function of transportation lag is

  18. A.
    G(jω) = ejωT
    B.
    G(jω) = e-jωT
    C.
    G(jω) = (1 + jωT)
    D.
    G(jω) = (1 - jωT)

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  19. In the given figure the input frequency f = 0.1 (1/2 p RC)

  20. A.
    0 dB
    B.
    3 dB
    C.
    -3 dB
    D.
    20 dB

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