Exercise: Automatic Control Systems

Questions for: Automatic Control Systems

A conditionally stable system is stable for the value of gain between two critical values. It is unstable if
A:
the gain is increased beyond upper critical value
B:
the gain is decreased below lower critical value
C:
both (a) and (b)
D:
none of the above
Answer: C
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Assertion (A): Integration in time domain is converted into division in s domain

Reason (R):

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R are correct but R is not correct explanation of A
C:
A is correct but R is wrong
D:
R is correct but A is wrong
Answer: B
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Assertion (A): In root locus the breakaway and break in points either lie on real axis or occur in complex conjugate pairs.

Reason (R): All root locus asymptotes intersect on real axis.

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R are correct but R is not correct explanation of A
C:
A is correct but R is wrong
D:
R is correct but A is wrong
Answer: B
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For 0 < M < 1, the centres of M circle lie to the right of origin.
A:
True
B:
False
C:
D:
Answer: A
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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.

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R are correct but R is not correct explanation of A
C:
A is correct but R is wrong
D:
R is correct but A is wrong
Answer: A
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