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

Magnitudes of voltages applied to the two stator windings
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

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Automatic Control Systems
Which of the following features is not associated with Nichols chart?

The frequency at intersection of G(j?) locus and M = +3 dB locus gives bandwidth of closed loop system
(0 dB, -180°) point on Nichols chart represent critical Point (-1, 0)
It is symmetric about -180°
M loci are centred about (0 dB, -180°) point

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