1
GATE EE 1998
MCQ (Single Correct Answer)
+1
-0.3
In a commutation circuit employed to turn off an $$SCR$$, Satisfactory turn-off is obtained when.
A
Circuit turn-off time
< device turn-off time
B
Circuit turn-off time
> device turn-off time
C
Circuit time constant
> device turn-off time
D
Circuit time constant
< device turn-off time
2
GATE EE 1998
MCQ (Single Correct Answer)
+2
-0.6
When the firing angle $$\alpha $$ of a single phase, fully controlled rectifier feeding constant $$d.c.$$ current into a load is $${30^ \circ }$$ , the displacement power factor of the rectifier is
A
$$1$$
B
$$0.5$$
C
$${1 \over {\sqrt 3 }}$$
D
$${{\sqrt 3 } \over 2}$$
3
GATE EE 1998
MCQ (Single Correct Answer)
+2
-0.6
A $$3$$-phsae, fully controlled, converter is feeding power into a $$d.c.$$ load at a constant current of $$150A.$$ The $$r.m.s$$ current through each thyristor of the converter is
A
$$50A$$
B
$$100A$$
C
$${{150\sqrt 2 } \over {\sqrt 3 }}$$
D
$${{150} \over {\sqrt 3 }}$$
4
GATE EE 1998
MCQ (Single Correct Answer)
+1
-0.3
The reflection coefficient for the transmission line shown in figure at $$P$$ is GATE EE 1998 Power System Analysis - Parameters and Performance of Transmission Lines Question 86 English
A
$$ + 1$$
B
$$ - 1$$
C
$$0$$
D
$$0.5$$
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