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ECE :: Automatic Control Systems

  1. A phase lead network with where a < 1, gives maximum phase lead at a frequency equal to

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  3. Generally a servomotor operates at

  4. A.
    high torque and high speed
    B.
    low torque and low speed
    C.
    low torque and high speed
    D.
    high torque and low speed

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  5. If C is thermal capacitance, m is mass of liquid and c is specific heat, then

  6. A.
    C = mc
    B.
    c = mC
    C.
    m = cC
    D.
    C = (mc)2

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  7. Assertion (A): The concept of impulse function is useful in differentiating discontinuous functions.

    Reason (R):

  8. A.
    Both A and R are correct and R is correct explanation of A
    B.
    Both A and R are correct but R is not correct explanation of A
    C.
    A is correct but R is wrong
    D.
    R is correct but A is wrong

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  9. In a two phase servomotor, if R is rotor resistance, X is rotor reactance, L is rotor length D is rotor diameter then

  10. A.
    and are both small
    B.
    is large but is small
    C.
    is small but is large
    D.
    and are both large

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  11. The ac motor used in servo applications is

  12. A.
    single phase induction motor
    B.
    two phase induction motor
    C.
    3 phase induction motor
    D.
    synchronous motor

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  13. For the log magnitude Bode plot of the given figure, the transfer function is

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  15. A first-order system has a time constant t. For unit ramp input, the steady state error is

  16. A.
    t2
    B.
    t
    C.
    t
    D.
    1/t

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  17. The system in the given figure is

  18. A.
    type 0 system
    B.
    type 1 system
    C.
    type 2 system
    D.
    type 3 system

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  19. For the equation where Q is heat energy, Ct is thermal capacitance and θ is temperature, the analogous electrical equation is

  20. A.
    B.
    C.
    D.
    none of the above

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