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Automatic Control Systems - Engineering

Q1:

At corner frequency the phase angle of factor is - 45°

A true

B False

ANS:A - true

Because in which angle is -tan'wt (tan inverse wt), and corner frequency is nothing but the pole of system or inverse of time constant is 1/T.

So angle at corner frequency i.e. at w=Wc=1/T is -tan'(T/T) or -tan'(1) = -45 degree.