1
MCQ (Single Correct Answer)

GATE ECE 2003

The gain margin and the phase margin of a feedback system with G(s)H(s)=$${s \over {{{\left( {s + 100} \right)}^3}}}$$ are
A
0 dB, $${0^0}$$
B
$$\infty ,\infty $$
C
$$\infty ,{0^0}$$
D
88.5 dB, $$\infty $$
2
MCQ (Single Correct Answer)

GATE ECE 2003

The approximate Bode magnitude plot of a minimum-phase system is shown in figure. The transfer function of the system is
A
$${10^8}{{{{\left( {s + 0.1} \right)}^3}} \over {{{\left( {s + 10} \right)}^2}\left( {s + 100} \right)}}$$
B
$${10^7}{{{{\left( {s + 0.1} \right)}^3}} \over {{{\left( {s + 10} \right)}}\left( {s + 100} \right)}}$$
C
$${10^8}{{{{\left( {s + 0.1} \right)}^2}} \over {{{\left( {s + 10} \right)}^2}\left( {s + 100} \right)}}$$
D
$${10^9}{{{{\left( {s + 0.1} \right)}^3}} \over {\left( {s + 10} \right){{\left( {s + 100} \right)}^2}}}$$
3
MCQ (Single Correct Answer)

GATE ECE 2002

The system with the open loop transfer function G(s)H(s)=$${1 \over {s\left( {{s^2} + s + 1} \right)}},$$ has a gain margin of
A
-6 dB
B
0 dB
C
3.5 dB
D
6 dB
4
MCQ (Single Correct Answer)

GATE ECE 2001

The open-loop DC gain of a unity negative feedback system with closed-loop transfer function $${{s + 4} \over {{s^2} + 7s + 13}}$$ is
A
$${4 \over {13}}$$
B
$${4 \over 9}$$
C
$$4$$
D
$$13$$

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