Q. Nichols chart consists of M and N locii in log magnitude versus phase diagram.

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Q. Examine the following statements

1. Air and gases are compressible.
2. Air, gases and some liquids are compressible.
3. Oil can function as hydraulic fluid as well as lubricator.

Which of the above statements are correct?

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Q. Which control action is also called rate control?

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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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