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Automatic Control Systems

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
DC tachogenerator can be used in

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

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Automatic Control Systems
In force current analogy, displacement x is analogous to

Charge
Voltage
Electrostatic energy
Magnetic flux linkage

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

Zero
less than 1
1
More than 1

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

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

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Automatic Control Systems
Integral control action

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

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