1
GATE EE 2003
+1
-0.3
A fully controlled natural commuted $$3$$-phase bridge rectifier is operating with a firing angle $$\alpha = {30^0}.$$ The peak to peak voltage ripple expressed as a ratio of the peak output $$dc$$ voltage at the output of the converter bridge is
A
$$0.5$$
B
$$\sqrt 3 /2$$
C
$$1 - \sqrt 3 /2$$
D
$$\sqrt 3 - 1$$
2
GATE EE 2002
+1
-0.3
A six pulse thyristor rectifier bridge is connected to a balanced $$50Hz$$ three phase $$ac$$ source. Assuming that the $$dc$$ output current of the rectifier is constant, the lowest frequency harmonic component in the $$ac$$ source line current is
A
$$100$$ $$Hz$$
B
$$150$$ $$Hz$$
C
$$250$$ $$Hz$$
D
$$300$$ $$Hz$$
3
GATE EE 2001
+1
-0.3
$$AC$$ to $$DC$$ circulating current dual converters are operated with the following relationship between their triggering angles $$\left( {{\alpha _1}} \right.$$ and $$\left. {{\alpha _2}} \right).$$
A
$${\alpha _1} + {\alpha _2} = {180^0}$$
B
$${\alpha _1} + {\alpha _2} = {360^0}$$
C
$${\alpha _1} - {\alpha _2} = {180^0}$$
D
$${\alpha _1} + {\alpha _2} = {90^0}$$
4
GATE EE 2000
+1
-0.3
A thyristorised three phase fully controlled converter feeds a $$dc$$ load that draws a constant current. Then the input $$ac$$ line current to the converter has
A
An $$r.m.s$$ value equal to the $$dc$$ load current
B
An average value equal to the $$dc$$ load current
C
A peak value equal to the $$dc$$ load current
D
A fundamental frequency component, whose $$r.m.s$$ value is equal to the $$dc$$ load current
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