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ECE :: Automatic Control Systems

  1. Assertion (A): If points at infinity are included, G(s) has same number of poles and zeros.

    Reason (R): The function has a zero at s = - 2.

  2. 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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  3. If the characteristic equation is (λ + 1) (λ + 2) (λ + 3) = 0, the eigen values are

  4. A.
    -1, -2, -3
    B.
    1, 2, 3
    C.
    0, 1, 2
    D.
    0, 2, 3

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  5. Lag compensation permits a high gain at low frequencies.

  6. A.
    True
    B.
    False

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  7. If the poles lie in second quadrant, damping ratio is

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

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  9. Assertion (A): When performance specifications are given in term of transient response characteristics, root locus method is a suitable method.

    Reason (R): When performance specifications in terms of state variables are given, modern control methods can be used.

  10. 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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  11. Integral control action

  12. A.
    removes offset
    B.
    may lead to oscillatory response
    C.
    both (a) and (b)
    D.
    neither (a) nor (b)

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  13. If , the closed loop pole will be located at s = -12 when K =

  14. A.
    4355
    B.
    5760
    C.
    9600
    D.
    9862

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  15. The sensor generally used in incremental optical encoder is

  16. A.
    LED
    B.
    LCD
    C.
    photodiode
    D.
    either (a) or (b)

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  17. Robotic manipulator arms mostly use

  18. A.
    hydraulic actuator
    B.
    pneumatic actuator
    C.
    electric motor actuator
    D.
    none of the above

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  19. In terms of ξ and ωn the settling time of a second order systems for 2% criterion and step input is equal to

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