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Automatic Control Systems

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

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

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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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Automatic Control Systems
Nyquist stability criterion uses open loop frequency response characteristics.

False
True

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

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

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Automatic Control Systems
A conditionally stable system is stable for the value of gain between two critical values. It is unstable if

None of these
Both A and B
The gain is increased beyond upper critical value
The gain is decreased below lower critical value

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

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

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