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Automatic Control Systems

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

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

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

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

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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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Automatic Control Systems
A system is highly oscillatory if

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

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Automatic Control Systems
Bandwidth is proportional to speed of response.

False
True

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Automatic Control Systems
Transport lag usually exists in

Thermal, hydraulic and pneumatic systems
Pneumatic systems
Hydraulic systems and thermal systems
Thermal systems

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