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What is the effect of phase lag compensation on the performance of a servo system?

(a) For a given relative stability, the velocity constant is increased

(b) For a given relative stability, the velocity constant is decreased

(c) The bandwidth of the system is increased

(d) The time response is made faster

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Question is taken from Realization of Basic Compensators topic in portion Design of Control Systems

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Correct choice is (a) For a given relative stability, the velocity constant is increased

Explanation: Phase lag compensation is an integrator. It reduces the steady state error.

Velocity constant =1/steady state error

So velocity constant is increased.

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