Electronics and Communication Engineering - Power Electronics

31. 

In a thyristors are i = kva. The value of a is

A. about 0.5
B. about 2
C. about 5
D. about 20

Answer: Option C

Explanation:

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32. 

In an ordinary thyristor

A. turn on and turn off times are equal
B. turn on time is more than turn off time
C. turn off time is more than turn on time
D. turn on time may be equal, less than or more than turn off time

Answer: Option C

Explanation:

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33. 

Thyristors connected in series need :

A. static equalizing circuit
B. dynamic equalizing circuit
C. both static and dynamic equalizing circuits
D. none of the above

Answer: Option C

Explanation:

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34. 

The symbol in figure is for

A. SUS
B. SBS
C. SCS
D. None of the above

Answer: Option C

Explanation:

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35. 

If 4 quadrant operation is required we need

A. dual converter
B. full converter
C. semi converter
D. none of the above

Answer: Option A

Explanation:

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