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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)
Stator
Partly on stator and partly on rotor
Rotor

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

zero
less than 1
1
more than 1

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

True
False

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Automatic Control Systems
The sensor generally used in incremental optical encoder is

Either (a) or (b)
Photodiode
LED
LCD

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Automatic Control Systems
DC tachogenerator can be used in

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

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

Back emf
Field resistance
Motor friction and load
Armature resistance

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