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ECE :: Automatic Control Systems

  1. Assertion (A): If integral control action is included in the controller the offset can be eliminated.

    Reason (R): Integral control action may lead to oscillatory response.

  2. 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

  3. An ac tachometer has a drag cup construction so that

  4. A.
    rotor inertia is low
    B.
    rotor body is conducting
    C.
    rotor is easy to fabricate
    D.
    both (a) and (b)

  5. If the breakaway and break in points in the root locus are located at

  6. A.
    -2 and -1
    B.
    -2.47 and -3.77
    C.
    -4.27 and -7.73
    D.
    none of the above

  7. The constant M loci on G(s) plane are a family of circles.

  8. A.
    True
    B.
    False

  9. Assertion (A): Feedback control systems offer more accurate control than open loop systems.

    Reason (R): The feedback path establishes a link for comparison of input and output and subsequent error correction.

  10. 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

  11. Examine the following statements

    1. Pneumatic systems are fire proof.
    2. Pneumatic systems are explosion proof.
    3. Hydraulic systems are explosion proof.
    4. Hydraulic systems are fire proof.
    Which of the above statements are correct?

  12. A.
    1 only
    B.
    1 and 2 only
    C.
    1 2, 3, 4
    D.
    2, 3, 4 only

  13. For the given figure the equation of motion is

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

  15. The addition of a zero to the open loop transfer function

  16. A.
    pulls the root locus to the left and makes the system more stable
    B.
    pulls the root locus to the right and makes the system less stable
    C.
    either (a) or (b)
    D.
    neither (a) nor (b)

  17. Assertion (A): For a given system only one of the static error constants is finite and significant.

    Reason (R): If finite static error constant is large, the loop gain becomes smaller as ω approaches zero.

  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