The function corresponding to the Bode plot of Figure, is
A
$$A = jf/{f_{_1}}$$
B
$$A = 1/\left( {1 - j{f_1}/f} \right)$$
C
$$A = 1/\left( {1 + j{f_1}/f} \right)$$
D
$$A = 1 + jf/{f_1}$$
2
GATE EE 1997
Numerical
A unity feedback system with the open loop transfer function $$G\left( s \right) = {1 \over {s\left( {s + 2} \right)\left( {s + 4} \right)}}$$ has gain margin of ... $$dB.$$
Your Input ________
Answer
Correct Answer is 33.6
3
GATE EE 1991
Numerical
An under damped second order system having a transfer function of the form $$M\left( s \right) = {{k\omega _n^2} \over {{s^2} + 2\zeta {\omega _n}s + \omega _n^2}}\,\,$$ has frequency response plot shown in Fig. below, then the system gain $$K$$ is __________ and the damping factor is approximately _______
Your Input ________
Answer
Correct Answer is 0.2
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