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Automatic Control Systems

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

Motor friction and load
Armature resistance
Field resistance
Back emf

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

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

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Automatic Control Systems
A lead compensator

None of these
Increases the stability margin
Speeds up the transient response
Increases the stability margin and speeds up the transient-response.

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Automatic Control Systems
DC tachogenerator can be used in

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

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Automatic Control Systems
A system is highly oscillatory if

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

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Automatic Control Systems
M circles are symmetrical with respect to

M = 1 straight line
M = 1 straight line and imaginary axis
Real and imaginary axis
M = 1 straight line and real axis

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