The asymptotic approximation of the log magnitude vs frequency plot of a system containing only real poles and zeros is shown. Its transfer function is
The open loop transfer function of a unity feedback system is given by $$G\left( s \right) = \left( {{e^{ - 0.1s}}} \right)/s.$$
The gain margin of this system is
A
$$11.95$$ $$dB$$
B
$$17.67$$ $$dB$$
C
$$21.33$$ $$dB$$
D
$$23.9$$ $$dB$$
3
GATE EE 2008
MCQ (Single Correct Answer)
The asymptotic Bode magnitude plot of a minimum phase transfer function is shown in the figure:
This transfer function has
A
three poles and one zero
B
two poles and one zero
C
two poles and two zeros
D
one pole and two zeros
4
GATE EE 2007
MCQ (Single Correct Answer)
If $$X = {\mathop{\rm Re}\nolimits} G\left( {j\omega } \right),\,\,$$ and $$y = {\rm I}mG\left( {j\omega } \right)$$ then for $$\omega \to {0^ + },\,\,$$ the Nyquist plot for $$G\left( s \right) = 1/\left[ {s\left( {s + 1} \right)\left( {s + 2} \right)} \right]$$
A
$$x=0$$
B
$$x=-3/4$$
C
$$x=y-1/6$$
D
$$x = y/\sqrt 3 $$
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