GATE 2007 Electrical Engineering PYQ

Question

The system $$900/s(s+1)(s+9)$$ is to be such that its gain crossover frequency becomes same as its uncompensated phase crossover frequency and provides at $${45^0}$$  phase margin . To achieve this, one may use

Accepted Answer

a lag - lead compensator that provides an attenuation of $$20dB$$ and phase lead of $${45^0}$$ at the frequency of $$3$$ rad/s

Answer

a lag compensator that provides an attenuation of $$20dB$$ and a phase lag of $${45^0}$$ at the frequency of $$3\sqrt 3 $$ rad/s

Answer

a lead compensator that provides an amplification of $$20dB$$ and a phase lead of  $${45^0}$$ at the frequency of $$3$$ rad/s

Answer

a lag - lead compensator that provides an amplification of $$20dB$$ and a phase alg of  $${45^0}$$ at the frequency of $$\sqrt 3 $$ rad/s