Automatic Control Systems
Which dc servomotor requires strongest permanent magnet?

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

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

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

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