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Automatic Control Systems

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

False
True

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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

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

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Automatic Control Systems
A system is highly oscillatory if

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

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Automatic Control Systems
In root locus analysis the breakaway and break in points

None of these
Always occur in complex conjugate pairs
lie on the real axis
Either lie on the real axis or occur in complex conjugate pairs

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Automatic Control Systems
Temperature is analogous to

Voltage
Flux
Charge
None of these

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

LCD
Either (a) or (b)
LED
Photodiode

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