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Automatic Control Systems

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

Bode plot
Root locus
Nyquist plot
Nichols chart

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

Photodiode
Either (a) or (b)
LCD
LED

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Automatic Control Systems
Nichols chart consists of

None of these
Constant phase angle loci
Magnitude and phase angle loci in log-magnitude versus phase diagram
Constant magnitude loci

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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
If poles lie in first quadrant, damping ratio is

less than 1
1
Zero
More than 1

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Automatic Control Systems
Which dc servomotor requires strongest permanent magnet?

Either A or B
Surface wound armature
Slotted armature
Surface wound with stationary rotor

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