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Automatic Control Systems

Automatic Control Systems
The relative stability of a system is given by

Both phase and gain margins
Gain margin alone
Phase margin alone
Either (a) or (b)

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Automatic Control Systems
For any transfer function, the constant phase angle loci are

A family of circles
A family of straight lines
Neither (a) nor (b)
Either (a) or (b)

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Automatic Control Systems
The poles with greater displacement from the real axis correspond to

Stable response
Lower frequencies of oscillations
Unbounded output
Higher frequencies of oscillations

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Automatic Control Systems
A system is highly oscillatory if

Gain margin is high and phase margin is 180°
Gain margin is high
Gain margin is close to 1 or phase margin is zero
Gain margin is close to 1

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Automatic Control Systems
Nichols chart consists of

Constant phase angle loci
Constant magnitude loci
None of these
Magnitude and phase angle loci in log-magnitude versus phase diagram

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Automatic Control Systems
For a stable system having two or more gain crossover frequencies the phase margin is measured at the highest crossover frequency.

True
False

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