Automatic Control Systems
Which dc servomotor requires strongest permanent magnet?

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

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Automatic Control Systems
In a two phasor servomotor, the direction of rotation of the rotating field depends on

Phase relation of voltages applied to the two stator windings
Magnitudes of voltages applied to the two stator windings
None of these
Both magnitude and phase relationship of voltages applied to the two stator windings

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