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Automatic Control Systems

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

True
False

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Automatic Control Systems
Robotic manipulator arms mostly use

Pneumatic actuator
Hydraulic actuator
Electric motor actuator
None of these

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

False
True

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Automatic Control Systems
A system is highly oscillatory if

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

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Automatic Control Systems
Nichol’s chart is symmetric about – 180° axis.

True
False

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

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

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