Power Electronics - Part 1 Online Exam Quiz
Power Electronics - Part 1 GK Quiz. Question and Answers related to Power Electronics - Part 1. MCQ (Multiple Choice Questions with answers about Power Electronics - Part 1
A cycloconverter can be
Options
A : step down
B : step up
C : step down or step up
D : none of the above
In the below figure the average load current is 15 A. The rms value of transformer secondary current is
Options
A : 15 A
B : 10.61 A
C : 7.5 A
D : 14.14 A
In a 3 phase fully controlled converter the firing frequency is
Options
A : 3 times the line frequency
B : 6 times the line frequency
C : 9 times the line frequency
D : 12 times the line frequency
Two thyristor of same rating and same specifications
Options
A : will have equal turn on and turn off periods
B : will have equal turn on but unequal turn off periods
C : may have equal or unequal turn on and turn off periods
D : will have unequal turn on and turn off periods
The amount of dielectric heating is inversely proportional to frequency.
Options
A : True
B : False
C : -
D : -
A semiconverter feeding an RLE load operates in
Options
A : first quadrant only
B : first and second quadrants
C : first and fourth quadrants
D : first and third quadrants
The phenomenon of overlap in converter operation due to
Options
A : source resistance
B : source inductance
C : both source resistance and source inductance
D : high value of firing angle
A thyristor has a maximum allowable junction temperature of 120°C and the ambient temperature is 40°C. If thermal resistance is 1.6° C/W, the maximum allowable internal power dissipation is
Options
A : 20 W
B : 50 W
C : 92 W
D : 128 W
For a 12 pulse operation, the two 6 pulse units are fed by
Options
A : Y - Y and Y - Y transformers
B : ? - ? and ? - ? transformers
C : Y - Y and Y - ? transformers
D : Y - ? and Y - ? transformers
In a single phase full wave converter (M - 2 connection) feeding a highly inductive load, the firing angle for each thyristor is a in the respective half cycle. The period of conduction of each thyristor is
Options
A : p - a
B : p
C : p + a
D : p - 2 a
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