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ECE :: Automatic Control Systems

  1. The phase difference (jω - p1) means

  2. A.
    phasor drawn from p1 to jω
    B.
    phasor drawn from origin to p1
    C.
    phasor directed from origin to jω point
    D.
    phasor directed from jω to p1

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  3. If poles lie in first quadrant, damping ratio is

  4. A.
    1
    B.
    more than 1
    C.
    less than 1
    D.
    zero

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  5. For type 0 system the starting point (i.e. ω = 0) of polar plot is finite and is on positive real axis.

  6. A.
    True
    B.
    False

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  7. Which control action can never be used alone?

  8. A.
    Proportional
    B.
    Derivative
    C.
    Integral
    D.
    Both (b) and (c)

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  9. If , the number of branches of root locus are

  10. A.
    1
    B.
    2
    C.
    3
    D.
    4

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  11. N circles for a = a1, and a = a1 ± 180° n (where n = 1, 2, 3, ....) are the same.

  12. A.
    True
    B.
    False

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  13. If G(s)H(s) = K (T1s + 1)/[s2 (T2s + 1)] the system stability depended an relative magnitudes of T1 and T2.

  14. A.
    True
    B.
    False

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  15. In a simple on-off controller with differential gap, the magnitude of differential gap determines

  16. A.
    the level of accuracy
    B.
    the life of controller
    C.
    both (a) and (b)
    D.
    neither (a) nor (b)

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  17. If the Nyquist plot encircles the (-1 + j0) point clockwise once or more number of times, the system is unstable.

  18. A.
    True
    B.
    False

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  19. In an armature controlled dc motor let J be equivalent moment of inertia of motor and load, f0 be equivalent viscous friction coefficient of motor and load and θ be angular displacement of motor shaft. Then torque equation is

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