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The compensator G(s) =5(1+0.3s)/1+0.1s would provide a maximum phase shift of:

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The compensator G(s) =5(1+0.3s)/1+0.1s would provide a maximum phase shift of:

(a) 20°

(b) 30°

(c) 45°

(d) 60°

This question was addressed to me during an interview for a job.

The query is from Realization of Basic Compensators in portion Design of Control Systems

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Right choice is (b) 30°

To explain: The two corner frequencies are 1/0.3 and 1/0.1. The maximum phase lead occurs at mid frequency w =10/√ and maximum phase is 30°.

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