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Automatic Control Systems

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

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

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

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

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Automatic Control Systems
Nichols chart consists of

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

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

Back emf
Field resistance
Armature resistance
Motor friction and load

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Automatic Control Systems
In a simple on-off controller with differential gap, the magnitude of differential gap determines

The level of accuracy
The life of controller
Both (a) and (b)
Neither (a) nor (b)

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