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Automatic Control Systems

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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Automatic Control Systems
Which dc servomotor requires strongest permanent magnet?

Slotted armature
Surface wound armature
Either A or B
Surface wound with stationary rotor

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

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

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Automatic Control Systems
A system is highly oscillatory if

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

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

More than 1
Zero
1
less than 1

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Automatic Control Systems
Nichols chart consists of

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

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