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ECE :: Automatic Control Systems

  1. For 0 < M < 1, the centres of M circle lie to the right of origin.

  2. A.
    True
    B.
    False

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  3. Assertion (A): In root locus the breakaway and break in points either lie on real axis or occur in complex conjugate pairs.

    Reason (R): All root locus asymptotes intersect on real axis.

  4. 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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  5. Assertion (A): Integration in time domain is converted into division in s domain

    Reason (R):

  6. 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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  7. A conditionally stable system is stable for the value of gain between two critical values. It is unstable if

  8. A.
    the gain is increased beyond upper critical value
    B.
    the gain is decreased below lower critical value
    C.
    both (a) and (b)
    D.
    none of the above

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  9. Transport lag usually exists in

  10. A.
    thermal systems
    B.
    hydraulic systems and thermal systems
    C.
    pneumatic systems
    D.
    thermal, hydraulic and pneumatic systems

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  11. The constant magnitude of G(s) plane are

  12. A.
    a family of straight horizontal lines
    B.
    a family of straight inclined lines with positive slope
    C.
    a family of straight inclined lines with negative slope
    D.
    a family of circles

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  13. For a closed loop system
    The imaginary axis intercept of the root loci will be

  14. A.
    ± j 2.8
    B.
    ± J 0.28
    C.
    ± j 1.14
    D.
    ± j 11.4

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  15. Which of the following is correct?

  16. A.
    Speed torque characteristics of permanent magnet dc servomotor is more flat than that of wound field dc servomotor
    B.
    Speed torque characteristics of wound field dc servo- motor is more flat than that of permanent magnet dc servo motor
    C.
    Speed torque characteristics of wound field and permanent magnet dc servomotor are equally flat
    D.
    None of the above

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  17. Assertion (A): In an automobile the amount of fuel admitted to the engine is adjusted as per the difference between desired and actual speed.

    Reason (R): The control signal is the amount of fuel to be admitted to the engine.

  18. 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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  19. A system is highly oscillatory if

  20. A.
    gain margin is high
    B.
    gain margin is close to 1
    C.
    gain margin is close to 1 or phase margin is zero
    D.
    gain margin is high and phase margin is 180°

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