Automatic Control Systems
In a minimum phase system
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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If any term in the first column of a Routh array becomes zero, then
Answer: B
No answer description available for this question
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Assertion (A): Integration in time domain is converted into division in s domain
Reason (R): 
Answer: B
No answer description available for this question.
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The log magnitude curve for a constant gain K is a
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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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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From the noise point of view, bandwidth should
Answer: B
If noise is to be eliminated, bandwidth cannot be large.
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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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Which of the following features is not associated with Nichols chart?
Answer: D
No answer description available for this question.
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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
No answer description available for this question.
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In a second order system, the time constant t of exponential envelopes depends
Answer: C
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