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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. A system has high gain and phase margin. The system is

    2. A.
    very stable
    B.
    sluggish
    C.
    very stable and sluggish
    D.
    oscillatory

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  2. For the transfer function , the polar plot a is

    3. A.
    semi circle
    B.
    circle
    C.
    spiral
    D.
    none of the above

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  3. A proportional controller is basically

    4. A.
    an amplifier with adjustable gain
    B.
    an integrating amplifier
    C.
    an amplifier with infinite gain
    D.
    an amplifier with almost zero gain

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  4. A network has . Then

    5. A.
    it is lead network
    B.
    it is lag network
    C.
    it is lead network if T1 > T2 and lag network T1 < T2
    D.
    it is lead network if T1 < T2 and lag network T1 > T2

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  5. The given figure shows log magnitude versus ω plots of a system for different values of gain. For this system

    6. A.
    curve 1 shows highest gain margin and curve 2 shows poorest gain margin
    B.
    gain margins shown by the three curves are equal
    C.
    curve 1 shows poorest gain margin and curve 3 shows highest gain margin
    D.
    curve 3 shows poorest gain margin while curve 1 shows highest gain margin

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  6. The purpose of series quadrature windings in amplidyne is to

    7. A.
    neutralize the effect of armature reaction
    B.
    reduce commutation difficulties
    C.
    increase the gain
    D.
    increase response time

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  7. For the transport lag G(jω) = e-jωT, the phase angle

    8. A.
    is constant
    B.
    varies linearly with frequency
    C.
    varies linearly with low frequencies only
    D.
    values as per square law

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  8. In classical analogue, torque is analogous to

    9. A.
    current
    B.
    voltage
    C.
    charge
    D.
    voltage gradient

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  9. The pole zero plot of the given figure is for

    10. A.
    non-minimum phase function
    B.
    minimum phase function
    C.
    all pass function
    D.
    either (b) or (c)

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  10. For the function G(s) = the poles are at

    11. A.
    s = 0 and s = ∞
    B.
    s = j2np where n = 0, 1, 2
    C.
    s = ± j2np where n = 0, 1, 2..
    D.
    none of the above.

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