Exercise: Power Electronics

Questions for: Power Electronics

A thyristor needs protection against
A:
high
B:
high
C:
both high and high
D:
either high or high
Answer: C

Both high and high can destroy SCR.

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Which of these commutation methods uses an auxiliary SCR?
A:
Class A
B:
Class B
C:
Class C
D:
Class D
Answer: C

Class C commutation uses an auxiliary SCR and it is also called auxiliary commutation.

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A reactor is used in a dual converter operating in non-circulating current mode.
A:
True
B:
False
C:
D:
Answer: B

Reactor is used only for circulating current mode.

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In a single phase full wave ac regulator the rms value of load current is 20 A load is purely resistive. Then
A:
average thyristor current will be less than 20 A but rms thyristor current will be more than 20 A
B:
both the average and rms thyristor currents will be less than 20 A
C:
both the average and rms thyristor currents will be more than 20 A
D:
rms thyristor current will be 20 A and average thyristor current will be 10 A
Answer: B

Each thyristor conducts for 50% of time.

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In 180° mode of operation of a 3 phase bridge inverter, two thyristors conduct at one time.
A:
True
B:
False
C:
D:
Answer: B

In 180° mode three thyristors conduct simultaneously.

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