Automatic Control Systems
For any transfer function, the constant phase angle loci are

A family of straight lines
Neither (a) nor (b)
Either (a) or (b)
A family of circles

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

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

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