1
GATE EE 2005
+2
-0.6
Consider a phase $$-$$ controlled converter shown in figure The thyristor is fired at an angle $$\alpha$$ in every positive half cycle of the input voltage. If the peak value of the instantaneous output voltage equals $$230$$ $$V,$$ the firing angle $$\alpha$$ is close to A
$${45^ \circ }$$
B
$${135^ \circ }$$
C
$${90^ \circ }$$
D
$${83.6^ \circ }$$
2
GATE EE 2003
+2
-0.6
A phase - controlled half - controlled single - phase converter is shown in figure. The control angle $$\alpha = {30^ \circ }$$ The output $$dc$$ voltage wave shape will be as shown in

A B C D 3
GATE EE 2002
+2
-0.6
A three phase thyristor bridge rectifier is used in a $$HVDC$$ link. The firing angle $$\alpha$$ (as measured from the point of natural commutation) is constrained to lie between $${5^ \circ }$$ and $${30^ \circ }$$. If the $$dc$$ side current and $$ac$$ side voltage magnitude are constant, which of the following statements is true (neglect harmonics in the $$ac$$ side current and commutation overlap in your analysis)
A
Reactive power absorbed by the rectifier is maximum when $$\alpha = {5^ \circ }$$
B
Reactive power absorbed by the rectifier is maximum when $$\alpha = {30^ \circ }$$
C
Reactive power absorbed by the rectifier is maximum when $$\alpha = {15^ \circ }$$
D
Reactive power absorbed by the rectifier is maximum when $$\alpha = {15^ \circ }$$
4
GATE EE 2002
+2
-0.6
In the single phase diode bridge rectifier shown in fig, the load resistor is
$$R = 50\Omega .$$ The source voltage is
$$V = 200sin\omega t,$$
Where $$\omega = 2\pi \times 50$$ radians per second. The power dissipated in the load resistor $$R$$ is A
$${{3200} \over \pi }W$$
B
$${{400} \over \pi }W$$
C
$$400\,W$$
D
$$800\,W$$
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