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ECE :: Automatic Control Systems

  1. In force current analogy, displacement x is analogous to

  2. A.

     Charge

    B.

     Magnetic flux linkage

    C.

     Electrostatic energy

    D.

     Voltage

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  3. If the poles lie in second quadrant, damping ratio is

  4. A.

     1

    B.

     less than 1

    C.

     zero

    D.

     more than 1

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  5. If poles lie in first quadrant, damping ratio is

  6. A.

     1

    B.

     More than 1

    C.

     less than 1

    D.

     Zero

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  7. In a simple on-off controller with differential gap, the magnitude of differential gap determines

  8. A.

     The level of accuracy

    B.

     The life of controller

    C.

     Both (a) and (b)

    D.

     Neither (a) nor (b)

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  9. Bandwidth is proportional to speed of response.

  10. A.

     True

    B.

     False

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  11. Which of the following is correct?

  12. 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 per-manent 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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  13. The distance of poles from origin depends on

  14. A.

     Uqndamped natural frequency

    B.

     Damping ratio

    C.

     Both A and B

    D.

     Neither A nor B

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

  16. A.

     Stator

    B.

     Rotor

    C.

     Partly on stator and partly on rotor

    D.

     Either (a) or (b)

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  17. For any transfer function, the constant phase angle loci are

  18. A.

     A family of circles

    B.

     A family of straight lines

    C.

     Either (a) or (b)

    D.

     Neither (a) nor (b)

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  19. The addition of a pole to the open loop transfer function pulls the root locus

  20. A.

     To the right

    B.

     To the left and making the system more stable

    C.

     Towards right or left depending on the position of new pole

    D.

     None of the above

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