1
GATE EE 2012
MCQ (Single Correct Answer)
+2
-0.6
If $$x = \sqrt { - 1} ,\,\,$$ then the value of $${X^x}$$ is
A
$${e^{ - \pi /2}}$$
B
$${e^{ \pi /2}}$$
C
$$x$$
D
$$1$$
2
GATE EE 2012
MCQ (Single Correct Answer)
+2
-0.6
Given $$f\left( z \right) = {1 \over {z + 1}} - {2 \over {z + 3}}.$$ If $$C$$ is a counterclockwise path in the $$z$$-plane such that
$$\left| {z + 1} \right| = 1,$$ the value of $${1 \over {2\,\pi \,j}}\oint\limits_c {f\left( z \right)dz} $$ is
A
$$-2$$
B
$$-1$$
C
$$1$$
D
$$2$$
3
GATE EE 2012
MCQ (Single Correct Answer)
+1
-0.3
The typical ratio of latching current to holding current in a $$20$$ $$A$$ thyristor is
A
$$5.0$$
B
$$2.0$$
C
$$1.0$$
D
$$0.5$$
4
GATE EE 2012
MCQ (Single Correct Answer)
+1
-0.3
A half-controlled single-phase bridge rectifier is supplying an $$R$$-$$L$$ load. It is operated at a firing angle $$α$$ and the load current is continuous. The fraction of cycle that the freewheeling diode conducts is
A
$${1 \over 2}$$
B
$$\left( {1 - {\alpha \over \pi }} \right)$$
C
$${\alpha \over {2\pi }}$$
D
$${\alpha \over {\pi }}$$
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