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Automatic Control Systems

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

False
True

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

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

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Automatic Control Systems
Which of the following is used to obtain output position in a position control system?

Synchro
Strain gauge
Load cell
Thermistor

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Automatic Control Systems
A system is highly oscillatory if

Gain margin is high
Gain margin is high and phase margin is 180°
Gain margin is close to 1 or phase margin is zero
Gain margin is close to 1

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

True
False

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

Field resistance
Back emf
Armature resistance
Motor friction and load

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