Automatic Control Systems
A conditionally stable system is stable for the value of gain between two critical values. It is unstable if

The gain is decreased below lower critical value
The gain is increased beyond upper critical value
Both A and B
None of these

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Automatic Control Systems
A lag compensator

Improves steady state behavior and preserves the transient response of the system
Speeds up 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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Automatic Control Systems
In a two phasor servomotor, the direction of rotation of the rotating field depends on

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

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