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ECE :: Automatic Control Systems

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

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  3. A stepper motor is

  4. A.
    a two phase induction motor
    B.
    is a kind of rotating amplifier
    C.
    is an electromagnetic transducer used to convert an angular position of shaft into electrical signal
    D.
    is an electromechanical device which actuates a train of step angular movements in response to a train of input pulses on one to one basis

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  5. In a two phase ac servomotor rotor resistance is R and rotor reactance is X. The speed curve will be linear if

  6. A.
    B.
    C.
    D.
    X2 = R

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  7. In the given figure, the input frequency is such that R = XC. Then

  8. A.
    v0 lags vi by 45°
    B.
    v0 lags vi by 90°
    C.
    v0 leads vi by 45°
    D.
    v0 leads vi by 90°

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  9. From the noise point of view, bandwidth should

  10. A.
    be large
    B.
    not be too large
    C.
    should be as large as possible
    D.
    should be infinite

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  11. First column elements of Routh's tabulation are 3, 5, , 2. It means that there

  12. A.
    is one root in left half s plane
    B.
    are two roots in left half s plane
    C.
    are two roots in right half s plane
    D.
    is one root in right half s plane

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  13. When a unit step voltage drives a lag network the output

  14. A.
    remains constant at unit step value
    B.
    increases exponentially from zero to final value
    C.
    decreases exponentially from 1 to 0
    D.
    either (b) of (c) depending on values of R and C

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

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  17. For the circuit in the given figure,

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  19. A system has its two poles on the negative real axis and one pair of poles lies on jω axis. The system is

  20. A.
    stable
    B.
    unstable
    C.
    limitedly stable
    D.
    either (a) or (c)

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