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ECE :: Automatic Control Systems

  1. In control systems the output of sensor usually, is

  2. A.
    analog electrical signal
    B.
    digital electrical signal
    C.
    mechanical signal
    D.
    analog or digital electrical signal

  3. Magnetic amplifier is used for

  4. A.
    voltage amplification
    B.
    power amplification
    C.
    current amplification
    D.
    frequency amplification

  5. Assertion (A): In simplifying block diagram the product of transfer functions in feed forward direction must remain the same.

    Reason (R): In simplifying block diagram the product of transfer functions around a closed loop must remain the same.

  6. 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

  7. If block diagrams of the given figure (a) and (b) are to be equivalent, then

  8. A.
    G2 = G1
    B.
    G2 = -G1
    C.
    D.

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

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

  11. The response to sinusoidal excitation can be found by

  12. A.
    setting s = jω in the network function
    B.
    setting s = -jω in the network function
    C.
    taking inverse transform of network function
    D.
    none of the above

  13. Assertion (A): Industrial robots improve productivity.

    Reason (R): Robots can handle monotonous and complex jobs without error in operation.

  14. 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

  15. The phase angle curve of G(jω) H(jω) is drawn by adding the phase angles of individual factors.

  16. A.
    True
    B.
    False

  17. Temperature is analogous to

  18. A.
    voltage
    B.
    flux
    C.
    charge
    D.
    none of the above

  19. Consider the following statements about polar plots

    1. Addition of a non-zero pole to a transfer function results in further rotation of polar plot through an angle of - 90° as ω → ∞
    2. Addition of a pole at the origin to a transfer function rotates the polar plot at zero and infinite frequencies by a further angle of - 90°
    Of the above statements:

  20. A.
    Both are correct
    B.
    Both are wrong
    C.
    1 is correct and 2 is wrong
    D.
    2 is correct and 1 is wrong