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Automatic Control Systems

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

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

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Automatic Control Systems
Which dc servomotor requires strongest permanent magnet?

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

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Automatic Control Systems
In control systems the output of sensor usually, is

Digital electrical signal
Analog or digital electrical signal
Mechanical signal
Analog electrical signal

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Automatic Control Systems
For any transfer function, the constant phase angle loci are

Either (a) or (b)
A family of circles
Neither (a) nor (b)
A family of straight lines

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

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

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

Derivative
Integral
Both (b) and (c)
Proportional

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