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Automatic Control Systems

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

Nichols chart
Root locus
Bode plot
Nyquist plot

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

less than 1
1
More than 1
Zero

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Automatic Control Systems
Nichols chart consists of

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

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Automatic Control Systems
The relative stability of a system is given by

Phase margin alone
Both phase and gain margins
Gain margin alone
Either (a) or (b)

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

1
more than 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

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

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