Derivative control action is effective? - Automatic Control Systems

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

Derivative control action is effective?

Only during steady state periods

During both steady state and transient state periods

Only during transient state periods

Either during steady state or during transient state periods

Correct Answer : Option (C) : Only during transient state periods

Explanation : Derivative of constant is zero. Hence derivative control action is not effective is steady state.

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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%