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Automatic Control Systems

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

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

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

1
Zero
less than 1
More than 1

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Automatic Control Systems
Integral control action

May lead to oscillatory response
Removes offset
Neither (a) nor (b)
Both (a) and (b)

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Automatic Control Systems
DC tachogenerator can be used in

Neither A nor B
Both A and B
Position control system
Speed control system

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Automatic Control Systems
The effect of adding poles and zeros can be determined quickly by

Nyquist plot
Root locus
Nichols chart
Bode plot

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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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