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Automatic Control Systems

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

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

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Automatic Control Systems
A system is highly oscillatory if

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

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Automatic Control Systems
In the field controlled motor the entire damping comes from

Motor friction and load
Back emf
Field resistance
Armature resistance

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Automatic Control Systems
Nichols chart consists of

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

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Automatic Control Systems
Which of the following is open loop system?

Wind screen wiper
Aqualing
Respiratory system of animal
System for controlling antirocket missiles

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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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