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Automatic Control Systems

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

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

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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
In a simple on-off controller with differential gap, the magnitude of differential gap determines

The level of accuracy
Both (a) and (b)
Neither (a) nor (b)
The life of controller

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Automatic Control Systems
Lag compensation permits a high gain at low frequencies.

False
True

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Automatic Control Systems
In the field controlled motor the entire damping comes from

Armature resistance
Motor friction and load
Back emf
Field resistance

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

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

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