1
GATE ECE 1998
+1
-0.3
In the Bode-plot of a unity feedback control system, the value of phase of G($$j\omega$$) at the gain cross over frequency is $$- 125^\circ$$. The phase margin of the system is
A
$$- 125^\circ$$
B
$$- 55^\circ$$
C
$$55^\circ$$
D
$$125^\circ$$
2
GATE ECE 1998
+1
-0.3
The Nyquist plot of a loop transfer function G$$(j\omega )$$ H$$(j\omega )$$, of a system encloses the (-1, j0) point. The gain margin of the system is
A
less than zero
B
zero
C
greater than zero
D
infinity
3
GATE ECE 1995
+1
-0.3
Non - minimum phase transfer function is defined as the transfer function
A
which has zeroes in the right - half of S-plane.
B
which has zeroes only in the left - half of S-plane.
C
which has poles in the right - half of S-plane.
D
which has poles in the left - half of S-plane.
4
GATE ECE 1994
+1
-0.3
The 3-dB bandwidth of a typical second- order system with the transfer function $${{C\left( s \right)} \over {R(s)}} = {{\omega _n^2} \over {{s^2} + 2\xi {\omega _n}s + \omega _n^2}}$$, is given by
A
$${\omega _n}\sqrt {1 - 2{\xi ^2}}$$
B
$${\omega _n}\sqrt {(1 - {\xi ^2}) + \sqrt {{\xi ^4} - {\xi ^2} + 1} }$$
C
$${\omega _n}\sqrt {(1 - 2{\xi ^2}) + \sqrt {4{\xi ^4} - 4{\xi ^2} + 2} }$$
D
$${\omega _n}\sqrt {(1 - 2{\xi ^2}) - \sqrt {4{\xi ^4} - 4{\xi ^2} + 2} }$$
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