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

False
True

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Automatic Control Systems
Integral control action

Both (a) and (b)
Removes offset
May lead to oscillatory response
Neither (a) nor (b)

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Automatic Control Systems
Nichols chart consists of

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

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Automatic Control Systems
M circles are symmetrical with respect to

M = 1 straight line
M = 1 straight line and imaginary axis
M = 1 straight line and real axis
Real and imaginary axis

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

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

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