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
GATE EE Subjects
Electromagnetic Fields
Signals and Systems
Engineering Mathematics
General Aptitude
Power Electronics
Power System Analysis
Analog Electronics
Control Systems
Digital Electronics
Electrical Machines
Electric Circuits
Electrical and Electronics Measurement
EXAM MAP
Joint Entrance Examination