Exercise: Power Electronics

Questions for: Power Electronics

A single phase full wave regulator feeds R-L load. The best gating signal is
A:
short duration pulses
B:
long duration pulses
C:
pulse train
D:
either (a) or (b)
Answer: C

To ensure proper triggering pulse train in necessary because load is R - L.

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In a dual converter both converters work as rectifiers.
A:
True
B:
False
C:
D:
Answer: B

One operators as rectifier and the other as inverter.

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The two modes of operation of three phase bridge inverters are known as
A:
60° mode and 120° mode
B:
90° mode and 120° mode
C:
120° mode and 180° mode
D:
120° mode and 240° mode
Answer: C

In 180° mode each thyristor conducts for 180° and in 120° mode each thyristor conducts for 120°.

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In a 3 phase full converter the average load current is 150 A. The average thyristor current is
A:
150 A
B:
75A
C:
50 A
D:
25 A
Answer: C

Each thyristor conducts for one-third of one cycle.

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During forward blocking state of SCR, the voltage and current respectively are
A:
high and high
B:
low and low
C:
high and low
D:
low and high
Answer: C

Voltage is high but current is nearly zero.

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