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ECE :: Automatic Control Systems

Automatic Control Systems - Section 1
Automatic Control Systems - Section 2
Automatic Control Systems - Section 3
Automatic Control Systems - Section 4
Automatic Control Systems - Section 5
Automatic Control Systems - Section 6
Automatic Control Systems - Section 7
Automatic Control Systems - Section 8
Automatic Control Systems - Section 9
Automatic Control Systems - Section 10
Automatic Control Systems - section-11
  1. In root locus analysis the breakaway and break in points

    2. A.

     lie on the real axis
    B.

     Either lie on the real axis or occur in complex conjugate pairs
    C.

     Always occur in complex conjugate pairs
    D.

     None of the above

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

    3. A.

     True
    B.

     False

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  3. The complicated shapes in the polar plots are only due to time constants in the numerator of transfer functions.

    4. A.

     True
    B.

     False

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  4. Which of the following features is not associated with Nichols chart?

    5. A.

     (0 dB, -180°) point on Nichols chart represent critical Point (-1, 0)
    B.

     It is symmetric about -180°
    C.

     M loci are centred about (0 dB, -180°) point
    D.

     The frequency at intersection of G(j?) locus and M = +3 dB locus gives bandwidth of closed loop system

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  5. A lag compensator

    6. A.

     Speeds up the transient response of the system
    B.

     Improves steady state behavior of the system
    C.

     Improves steady state behavior and speeds up the transient response of the system
    D.

     Improves steady state behavior and preserves the transient response of the system

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  6. A lead compensator

    7. A.

     Speeds up the transient response
    B.

     Increases the stability margin
    C.

     Increases the stability margin and speeds up the transient-response.
    D.

     None of the above

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  7. The relative stability of a system is given by

    8. A.

     Gain margin alone
    B.

     Phase margin alone
    C.

     Both phase and gain margins
    D.

     Either (a) or (b)

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  8. Transport lag usually exists in

    9. A.

     Thermal systems
    B.

     Hydraulic systems and thermal systems
    C.

     Pneumatic systems
    D.

     Thermal, hydraulic and pneumatic systems

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  9. Robotic manipulator arms mostly use

    10. A.

     Hydraulic actuator
    B.

     Pneumatic actuator
    C.

     Electric motor actuator
    D.

     None of the above

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  10. Nichol’s chart is symmetric about – 180° axis.

    11. A.

     True
    B.

     False

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