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Automatic Control Systems

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

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

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

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

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Automatic Control Systems
M circles are symmetrical with respect to

M = 1 straight line and imaginary axis
Real and imaginary axis
M = 1 straight line
M = 1 straight line and real axis

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Automatic Control Systems
Which dc servomotor requires strongest permanent magnet?

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

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Automatic Control Systems
The complicated shapes in the polar plots are only due to time constants in the numerator of transfer functions.

False
True

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

Motor friction and load
Field resistance
Armature resistance
Back emf

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