The gain margin for a stable system - Automatic Control Systems

Electronics and Communication Engineering (ECE) : Automatic Control Systems - Quiz(MCQ)

The gain margin for a stable system

has a negative decibel value

has a large negative decibel value

has a positive decibel value

None of the above

Correct Answer : Option (C) : has a positive decibel value

Explanation : For a stable system gain margin is positive. Therefore decibel value is also positive.

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For a quadratic factor in denominator of transfer function the phase angle at corner frequency (in Bode phase angle plot)

is +90Â°

is -90Â°

depends on the damping factor

None of the above

Correct Answer : is -90Â°

The response to sinusoidal excitation can be found by

setting s = jÏ‰ in the network function

setting s = -jÏ‰ in the network function

taking inverse transform of network function

None of the above

Correct Answer : setting s = jÏ‰ in the network function

The resolution of a wire wound potentiometer is about

0.1%

0.001%

Correct Answer : 0.1%