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ECE :: Automatic Control Systems

  1. If zeros at infinity are included in the count, the number of zeros of G(s) H(s) is

  2. A.
    equal to number of poles
    B.
    one more than the number of poles
    C.
    one less than the number of poles
    D.
    none of the above

  3. The polar plot of the given figure can be for G(jω) =


  4. The distance of poles from origin depends on

  5. A.
    undamped natural frequency
    B.
    damping ratio
    C.
    both (a) and (b)
    D.
    neither (a) nor (b)

  6. In the field controlled motor the entire damping comes from

  7. A.
    armature resistance
    B.
    back emf
    C.
    motor friction and load
    D.
    field resistance

  8. The system matrix of continuous time system described in state variable form is

    The systems is stable for all values of x and y satisfying

  9. A.
    x < 1/2, y < 1/2
    B.
    x > 1/2, y > 0
    C.
    x < 0, y < 0
    D.
    x < 0, y < 1/2

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

  11. 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

  12. Polar plot of a lag-lead compensator is a circle.

  13. A.
    True
    B.
    False

  14. For the mechanical system in the given figure the transfer function =


  15. In control systems the word controller includes

  16. A.
    error detector and feedback element
    B.
    feedback element and control elements
    C.
    error detector and control elements
    D.
    error detector, control elements and feedback elements

  17. Assertion (A): When the forward gain of a system is increased, the transient response becomes oscillatory.

    Reason (R): Increasing the forward gain reduces steady state error.

  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