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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Q. A synchro transmitter receiver unit is a

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Q. The transfer function of transportation lag is

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Q. As the bandwidth increases, the cost of components

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Q. If Nyquist plot has a encirclement of (-1 + jo) point, the system is stable if

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Q. A conditionally stable system has

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Q. In a pneumatic bellows

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Q. Assertion (A): A large negative feedback is deliberately introduced in an amplifier to make its gain independent of variation in parameters of active device.

Reason (R): A large negative value of feedback results in a high value of return difference compared to unity which makes the feedback gain inversely proportional to the feedback factor.

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Q. An electromechanical device which actuates a train of step angular movements in response to a train of input pulses on one to one basis is

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Q. Assertion (A): If the Laplace transform is G(s) = 4/(s²+2s+4), the Laplaces transform of impulse response is given by C(s) = 4/(s²+2s+4)

Reason (R): The Laplace transform for an impulse function is 1.

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Q. The polar plot of G(jω) = 1/jω is the negative imaginary axis.

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Q. The number of branches of root locus plot is equal to

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Q. The action of bellows is similar to that of

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Q. For a second order system ωn is natural frequency, ωd is frequency of damped oscillations and ζ is damping factor. Then

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