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Automatic Control Systems

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

True
False

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

Integral
Both (b) and (c)
Proportional
Derivative

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Automatic Control Systems
A system is highly oscillatory if

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

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Automatic Control Systems
The sensor generally used in incremental optical encoder is

Photodiode
Either (a) or (b)
LED
LCD

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

Armature resistance
Motor friction and load
Back emf
Field resistance

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

True
False

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