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ECE :: Automatic Control Systems

  1. Which dc servomotor has minimum inertia?

  2. A.
    Slotted armature construction
    B.
    Surface wound armature
    C.
    Surface wound with stationary rotor
    D.
    Either (a) or (b)

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  3. Gas flow resistance is defined as

  4. A.
    B.
    C.
    (change in gas pressure difference) x (change in gas flow rate)
    D.
    none of the above

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  5. Examine the following statements

    1. A small size hydraulic actuator can develop good torque.
    2. It is easy to maintain a hydraulic system leak proof.
    3. Both linear and rotatary hydraulic actuators are available.
    4. Hydraulic power is more easily available than electric power.
    Which of the above statements are correct?

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

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  7. The given figure shows a constant current source driving a parallel RC circuit. It is equivalent to

  8. A.
    a lag network
    B.
    a lead network
    C.
    a lag-lead network
    D.
    either (a) or (b)

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  9. Consider the following statements regarding negative feedback

    1. It increases system gain
    2. It improves sensitivity
    3. It improves system stability
    Which of these are not correct?

  10. A.
    all
    B.
    1, 2
    C.
    1, 3
    D.
    1 only

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  11. Which of the following are applications of position control systems?

  12. A.
    Control of sheet and metal thickness in hot rolling mill
    B.
    Missile guidance of ships
    C.
    Radar tracking system
    D.
    All of the above

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  13. The system in the given figure has

  14. A.
    good gain and phase margins
    B.
    good gain margin and poor phase margin
    C.
    poor gain and phase margins
    D.
    poor gain margin but good phase margin

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  15. Assertion (A): Increasing the system gain improves steady state behaviour but may result in instability.

    Reason (R): A compensator is inserted into a system to ensure specified performance.

  16. 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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  17. Assertion (A): Inverse Laplace transform can be found from P(s) by inversion integral.

    Reason (R): The function f(t) is assumed to be zero for t < 0.

  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. For a second order system delay time td is the time required to reach

  20. A.
    half the final value for the very first time
    B.
    the final value for the very first time
    C.
    90% of the final value for the very first time
    D.
    none of the above

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