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Automatic Control Systems

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

LED
LCD
Photodiode
Either (a) or (b)

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Automatic Control Systems
The distance of poles from origin depends on

Damping ratio
Both A and B
Neither A nor B
Uqndamped natural frequency

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Automatic Control Systems
If the poles lie in second quadrant, damping ratio is

zero
less than 1
1
more than 1

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

Bode plot
Nichols chart
Nyquist plot
Root locus

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

False
True

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Automatic Control Systems
The permanent magnet field system of brushless dc servo- motor is generally on

Rotor
Partly on stator and partly on rotor
Either (a) or (b)
Stator

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