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1

GATE EE 2004

MCQ (Single Correct Answer)
The circuit in figure shows a full-wave rectifier. The input voltage is $$230$$ $$V$$ $$(rms)$$ single-phase ac. The peak reverse voltage across the diodes $${D_1}$$ and $${D_2}$$ is
A
$$100\sqrt 2 \,V$$
B
$$100$$ $$V$$
C
$$50\sqrt 2 \,V$$
D
$$50$$ $$V$$
2

GATE EE 2003

MCQ (Single Correct Answer)
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
$$\sqrt 3 - 1$$
3

GATE EE 2002

MCQ (Single Correct Answer)
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
$$300$$ $$Hz$$
4

GATE EE 2001

MCQ (Single Correct Answer)
$$AC$$ 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
$${\alpha _1} + {\alpha _2} = {90^0}$$

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