Automatic Control Systems
M circles are symmetrical with respect to

M = 1 straight line and imaginary axis
Real and imaginary axis
M = 1 straight line and real axis
M = 1 straight line

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

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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
Magnitudes 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?

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

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