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Automatic Control Systems

Answer: B

For stability poles must be in left half plane. Zeros in left half plane lead to minimum phase shift.

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Answer: B

No answer description available for this question

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Answer: B

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Answer: B

The factor K in the numerator of G(jω) gives is straight line at 20 log10 K in Bode plot.

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5.

Assertion (A): When the phase margin of a control system is improved using a lead network, noise transmission increases.

Reason (R): Phase lead compensation increases bandwidth.

Answer: A

More bandwidth means more noise.

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6.

From the noise point of view, bandwidth should

Answer: B

If noise is to be eliminated, bandwidth cannot be large.

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7.

The maximum shift which can be provided by a lead compensator with transfer function  is

Answer: B

The maximum phase lead is given by 

In this case a = 1/3. Hence sin Φm =  = 0.5 or Φm = 30°.

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Answer: D

No answer description available for this question.

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9.

Assertion (A): If minimum phase system has a gain margin of 8 dB and phase margin of 21°, the system is stable.

Reason (R): For a minimum phase system both GM and PM must be positive for the system to be stable.

Answer: A

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Answer: C

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