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Automatic Control Systems

Automatic Control Systems
The effect of adding poles and zeros can be determined quickly by

Nichols chart
Nyquist plot
Bode plot
Root locus

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

True
False

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

Either (a) or (b)
LED
LCD
Photodiode

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

Back emf
Field resistance
Motor friction and load
Armature resistance

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

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

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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

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

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