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Automatic Control Systems

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

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

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Automatic Control Systems
Nichols chart consists of

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

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Automatic Control Systems
A system is highly oscillatory if

Gain margin is close to 1 or phase margin is zero
Gain margin is close to 1
Gain margin is high
Gain margin is high and phase margin is 180°

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Automatic Control Systems
Which dc servomotor requires strongest permanent magnet?

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

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Automatic Control Systems
The complicated shapes in the polar plots are only due to time constants in the numerator of transfer functions.

True
False

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Automatic Control Systems
M circles are symmetrical with respect to

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

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