Exercise: Power Electronics

Questions for: Power Electronics

All inverters use forced commutation.
A:
True
B:
False
C:
D:
Answer: B

Line commutated inverters are also used especially in HVDC.

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The number of doped regions in a SCR is
A:
2
B:
3
C:
4
D:
5
Answer: C

p = n = p = n.

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In a single phase full wave converter (M - 2 connection), the rms transformer voltage is 300 V across each half of secondary. The PIV for each thyristor is
A:
300 V
B:
C:
6002 V
D:
Answer: C

PIV is twice the peak voltage across each half of secondary.

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Assertion (A): An inverter does not require forced commutation

Reason (R): A series inverter is a forced commutation inverter.

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R correct but R is not correct explanation of A
C:
A is correct but R is wrong
D:
A is wrong but R is correct
Answer: D

Some inverters require forced commutation.

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A 750 A circuit uses thyristor of current rating 175 A. If derating is 25%, the number of thyristors in parallel is
A:
3
B:
4
C:
6
D:
10
Answer: C

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