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
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

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

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

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Automatic Control Systems
A lag compensator

Speeds up the transient response of the system
Improves steady state behavior and preserves the transient response of the system
Improves steady state behavior and speeds up the transient response of the system
Improves steady state behavior of the system

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