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Automatic Control Systems

Automatic Control Systems
Integral control action

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

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Automatic Control Systems
A conditionally stable system is stable for the value of gain between two critical values. It is unstable if

Both A and B
The gain is decreased below lower critical value
None of these
The gain is increased beyond upper critical value

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

True
False

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Automatic Control Systems
Gain margin and phase margin can be determined from Bode plots as well as Nyquist plot.

True
False

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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
The sensor generally used in incremental optical encoder is

Either (a) or (b)
LCD
Photodiode
LED

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