Automatic Control Systems
M circles are symmetrical with respect to

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

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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
Phase relation of voltages applied to the two stator windings
Both magnitude and phase relationship of voltages applied to the two stator windings
Magnitudes of voltages applied to the two stator windings

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Automatic Control Systems
A lag compensator

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
Speeds up the transient response of the system
Improves steady state behavior of the system

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