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ECE :: Automatic Control Systems

  1. The polar plot in the given figure is for the term

  2. A.
    jωT
    B.
    1 + jωT
    C.
    D.

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  3. The compensator in the given figure is a

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

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  5. If G(s) H(s) = , the closed loop poles are on

  6. A.
    negative real axis
    B.
    jω axis
    C.
    right half plane
    D.
    either (a) or (b)

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  7. For the block diagram of the given figure, the equation describing system dynamics is

  8. A.
    (1 + RCs) Δθ0(s) = Δθi(s) + R Δ H(s)
    B.
    (1 + RCs) [ΔH(s)] = Δθ(s) - Δθ0(s)
    C.
    (1 + RCs) Δθ0(s) = RΔ H(s) - Δ θi(s)
    D.
    (1 + RCs) Δθi(s) = Δ H(s)[R] - Δθ0(s)

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  9. For the given figure C(s)/R(s)

  10. A.
    K
    B.
    0.5 K
    C.
    2 K
    D.
    0.25 K

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  11. The polar plot of

  12. A.
    does not cross real axis
    B.
    crosses real axis
    C.
    crosses real axis at ω = 0.7 rad/sec
    D.
    crosses real axis at ω = 1.4 rad/sec

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  13. In a second order undamped system, the poles are on

  14. A.
    positive real axis
    B.
    imaginary axis
    C.
    negative real axis
    D.
    either (a) or (c)

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  15. For the system of the given figure, the undamped natural frequency of closed loop poles is

  16. A.
    2 rad/sec
    B.
    1 rad/sec
    C.
    0.5 rad/sec
    D.
    0.25 rad/sec

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  17. An open loop system has a forward path transfer function (42.25)/s(s + 6.5). The unit step response of the system starting from rest will have its maximum value at a time equal to

  18. A.
    0 sec
    B.
    0.56 sec
    C.
    5.6 sec
    D.
    infinity

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  19. In the given figure

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