Automatic Control Systems
Nichols chart consists of

Constant magnitude loci
Magnitude and phase angle loci in log-magnitude versus phase diagram
Constant phase angle loci
None of these

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

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