Exercise: Power Electronics

Questions for: Power Electronics

A single phase fully controlled bridge converter is fed by a voltage Vm sin ωt. The average and rms values of output voltage are
A:
B:
C:
cos a and Vm
D:
cos a and 2 Vm
Answer: A
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When thyristors are connected in parallel, the current distribution may become non-uniform due to
A:
inductive effect of current carrying conductors
B:
capacitive effect of current carrying conductors
C:
both inductive and capacitive effects
D:
none of the above
Answer: A
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In a bridge inverter
A:
an output transformer is essential
B:
an output transformer is not essential
C:
an output transformer cannot be connected
D:
an output transformer, if used, can improve the efficiency of the circuit
Answer: B
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The number of thyristors in a single phase fully controlled bridge rectifier is
A:
16
B:
8
C:
4
D:
2
Answer: C
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The method of triggering SCS is
A:
application of positive pulse at cathode gate or negative pulse at anode gate
B:
application of pulse at anode gate
C:
application of pulse at cathode gate
D:
application of low voltage at anode
Answer: A
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