Exercise: Power Electronics

Questions for: Power Electronics

A single phase semiconverter is feeding a highly inductive load. The circuit has a freewheeling diode across the load and firing angle is a. During one cycle of input voltage, the total duration of conduction of freewheeling diode is
A:
a
B:
2 a
C:
4 a
D:
0.5 a
Answer: B

Freewheeling diode conducts for a° in each half cycle.

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HVDC transmission systems generally use
A:
12 pulse converters
B:
6 pulse converters
C:
3 pulse converters
D:
either 12 or 6 pulse converters
Answer: A

To reduce ripple, 12 pulse converters are used in HVDC.

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A single phase half wave controlled rectifier circuit is feeding on RL load. The circuit has a freewheeling diode. The input voltage is v = Vm sin ωt. If I0 is the load current during the conduction of freewheeling diode, the KVL equation during the conduction of free wheeling diode is
A:
B:
C:
D:
Answer: B

Load is short-circuited by free wheeling diode.

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Induction heating systems require low frequency inverters.
A:
True
B:
False
C:
D:
Answer: B

It uses high frequency inverter.

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In a full wave converter (M - 2 connection) feeding an RLE load, the peak thyristor current is 15 A. For fully controlled bridge circuit and same load current, the peak thyristor current will be
A:
30 A
B:
152 A
C:
15 A
D:
Answer: C

In both the connections the output voltage and peak thyristor current are the same. Both are full wave rectifiers.

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