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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
In the field controlled motor the entire damping comes from

Motor friction and load
Armature resistance
Back emf
Field resistance

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Automatic Control Systems
In Bode plots the frequency at which two asymptotes meet is called corner frequency.

False
True

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

False
True

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

more than 1
1
less than 1
zero

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

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

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