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

Both (a) and (b)
The level of accuracy
The life of controller
Neither (a) nor (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
None of these
Magnitudes of voltages applied to the two stator windings
Phase relation of voltages applied to the two stator windings

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