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Automatic Control Systems

Automatic Control Systems
Magnetic amplifier is used for

Voltage amplification
Current amplification
Power amplification
Frequency amplification

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

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

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Automatic Control Systems
For type 1 system the velocity lag error is

Independent of gain constant
Directly proportional to gain constant
Inversely proportional to bandwidth of system
Inversely proportional to gain constant

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Automatic Control Systems
Temperature is analogous to

Voltage
Flux
None of these
Charge

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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.

False
True

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