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Automatic Control Systems

Automatic Control Systems
The permanent magnet field system of brushless dc servo- motor is generally on

Partly on stator and partly on rotor
Rotor
Stator
Either (a) or (b)

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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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Automatic Control Systems
A lead compensator

Increases the stability margin
None of these
Increases the stability margin and speeds up the transient-response.
Speeds up the transient response

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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 close to 1 or phase margin is zero
Gain margin is high
Gain margin is close to 1

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Automatic Control Systems
In Bode plots the frequency at which two asymptotes meet is called corner frequency.

False
True

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Automatic Control Systems
Gain margin and phase margin can be determined from Bode plots as well as Nyquist plot.

False
True

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