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For a stable closed loop system, the gain at phase crossover frequency should always be:

(a) < 20 dB

(b) < 6 dB

(c) > 6 dB

(d) > 0 dB

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Correct choice is (d) > 0 dB

Best explanation: Phase crossover frequency is the frequency at which the gain of the system must be 1 and for a stable system the gain is decibels must be 0 db.

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