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Automatic Control Systems

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

False
True

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Automatic Control Systems
Which dc servomotor requires strongest permanent magnet?

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

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Automatic Control Systems
A system is highly oscillatory if

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

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Automatic Control Systems
The poles with greater displacement from the real axis correspond to

Lower frequencies of oscillations
Higher frequencies of oscillations
Stable response
Unbounded output

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

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

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Automatic Control Systems
Which control action can never be used alone?

Integral
Derivative
Proportional
Both (b) and (c)

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