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Q1:

The open loop transfer function of a unity feedback control system is given as The phase cross over frequency and the gain margin are respectively.

A
and

B
and

C
and

D
and

ANS:A -

and

At phase cross over frequency -90° - tan- 1 ωT1 - tan- 1 ωcT2 = - p = 90° GM = 1/a where a = | G(jω)|ω=ωc .



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