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Automatic Control Systems

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
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
Gain margin is close to 1 or phase margin is zero

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

less than 1
zero
1
more than 1

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Automatic Control Systems
The complicated shapes in the polar plots are only due to time constants in the numerator of transfer functions.

False
True

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Automatic Control Systems
Which control action can never be used alone?

Proportional
Derivative
Both (b) and (c)
Integral

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

False
True

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