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Automatic Control Systems

Automatic Control Systems
The complicated shapes in the polar plots are only due to time constants in the numerator of transfer functions.

True
False

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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.

False
True

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Automatic Control Systems
If the poles lie in second quadrant, damping ratio is

zero
less than 1
1
more than 1

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

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

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

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

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Automatic Control Systems
Nichols chart consists of

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

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