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ECE :: Automatic Control Systems

Automatic Control Systems - Section 1
Automatic Control Systems - Section 2
Automatic Control Systems - Section 3
Automatic Control Systems - Section 4
Automatic Control Systems - Section 5
Automatic Control Systems - Section 6
Automatic Control Systems - Section 7
Automatic Control Systems - Section 8
Automatic Control Systems - Section 9
Automatic Control Systems - Section 10
Automatic Control Systems - section-11

  1. In the given figure the input frequency is such that R << Xc, then

    2. A.
    v0 lags vi by 90°
    B.
    v0 leads vi by 90°
    C.
    v0 and vi are in phase
    D.
    either (b) or (c)

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  2. In the given figure, of potentiometer V0 = Vi (R0/Ri) only when

    3. A.
    RL = 0
    B.
    RL = ∞
    C.
    RL is neither low nor high
    D.
    RL is low but not zero

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  3. A unity feedback system has open loop transfer function The closed loop transfer function is

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  4. Bellows converts

    5. A.
    pressure difference into displacement
    B.
    pressure difference into voltage
    C.
    displacement into pressure difference
    D.
    either (a) or (c)

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  5. Assertion (A): The steady state response, of a stable, linear, time invariant system, to sinusoidal input depends on initial conditions.

    Reason (R): Frequency response, in steady state, is obtained by replacing s in the transfer function by jω

    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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  6. Consider the systems with following open loop transfer functions

    If unity feedback is used, the increasing order of time taken for unit step response to settle is

    7. A.
    1, 2, 3
    B.
    3, 1, 2
    C.
    2, 3, 1
    D.
    3, 2, 1

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  7. The phase margin and damping ratio have no relation.

    8. A.
    True
    B.
    False

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  8. The log magnitude curve for a constant gain K is a

    9. A.
    horizontal straight line
    B.
    horizontal straight line of magnitude 20 log K decibels
    C.
    an inclined line having slope K
    D.
    an inclined line having slope -K

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  9. The compensator of the given figure is a

    10. A.
    lag compensator
    B.
    lead compensator
    C.
    lag-lead compensator
    D.
    none of the above

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  10. If error voltage is e(t), integral square error =

    11. A.
    e2(t) dt
    B.
    C.
    D.
    none of the above

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