Q. The gain margin for a stable system

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Q. For overdamped systems a quadratic factor in transfer function can be replaced by two first order factors with real poles

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Q. A lead compensator is basically a

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Q. In Bode diagram (log magnitude plot) of the factor 1/(1 + jωT) in the transfer function the log magnitude for ω << 1/T can be approximated by

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Q. Assertion (A): The part of root locus on the real axis is not dependent on the poles and zeros which are not on the real axis.

Reason (R): Poles and zeros which are not on the real axis occur in conjugate pairs

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Q. The phase angle of 1/jω is constant and equal to - 90° for all values of ω

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Q. For underdamped second order systems the rise time is the time required for the response to rise from

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Q. When time constant T in any factor is varied, the shapes of log magnitude and phase angle curves remain the same.

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Q. Which of the following is not correct for two phase servomotor?

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Q. DC servomotors are, generally

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Q. The gain margin of first and second order systems is infinite.

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Q. One advantage of using polar plot is that it depicts the frequency response characteristics over the entire frequency.

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Q. The force required to initiate motion between two contacting surfaces is called

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Q. Assertion (A): Derivative control action cannot be used alone.

Reason (R): Derivative control action is effective only during transient periods.

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Q. The slope of log magnitude curve near the cut off frequency is called cut off rate.

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Q. Consider the following statements:

The gain margin and phase margin of an unstable system may respectively be

1. positive, positive
2. positive, negative
3. negative, positive
4. negative, negative

Of these statements

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Q. A first order element yields almost exact duplication only for constant or slowly varying phenomenon.

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Q. For a stable system

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Q. If G(s)H(s) = K/s²(s²+2s+2), the angle of departure of root locus at s = - 1 + j is

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Q. Accurate amplitude measurements can be made more easily than accurate phase shift measurements.

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