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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. Assertion (A): When the performance of a stable second order system is improved by a PID controller, the system may become unstable.

    Reason (R): PID controller increases the order of the system to 3.

    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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  2. The root locus branches

    3. A.
    start from open loop poles and terminate at zeros
    B.
    start from open loop zeros and terminate at poles
    C.
    may start from pole or zero and terminate at another pole or zero
    D.
    none of the above

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  3. In force voltage analogy, displacement is analogous to

    4. A.
    current
    B.
    voltage
    C.
    charge
    D.
    none of the above

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  4. M circles are symmetrical with respect to real axis.

    5. A.
    True
    B.
    False

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  5. For the system with , the maximum resonance peak is

    6. A.
    4
    B.
    4/3
    C.
    2
    D.
    2/3

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  6. The angular location of poles depends on

    7. A.
    undamped natural frequency
    B.
    damping ratio
    C.
    both (a) and (b)
    D.
    neither (a) nor (b)

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  7. For the characteristic equation s5 + s4 + 2s3 + 2s2 + 3s + 15 = 0, the number of roots in left half s plane are

    8. A.
    1
    B.
    2
    C.
    3
    D.
    5

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  8. At corner frequency the phase angle of factor 1/(1 + jωT) is

    9. A.
    +90°
    B.
    -90°
    C.
    +45°
    D.
    -45°

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  9. Frequency response approach is a simple approach to control system design.

    10. A.
    True
    B.
    False

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  10. The pole zero plot of the given figure is for

    11. A.
    non-minimum phase function
    B.
    minimum phase function
    C.
    all pass function
    D.
    none of the above

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