Electronics and Communication Engineering - Power Electronics

26. 

When an SCR is in forward blocking mode, the applied voltage

A. appears across only one junction
B. is equally shared by two junctions
C. is equally shared by three junctions
D. may appear across one or more junctions

Answer: Option A

Explanation:

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27. 

In sinusoidal PWM for inverters the width of different pulses are not the same.

A. True
B. False

Answer: Option A

Explanation:

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28. 

A class D chopper

A. can operate in first quadrant only
B. can operate in second quadrant only
C. can operate in either first or fourth quadrant
D. can operate in all the quadrants

Answer: Option C

Explanation:

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29. 

The symbol in figure is for

A. UJT
B. PUT
C. SCS
D. SBS

Answer: Option B

Explanation:

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30. 

The efficiency of a chopper circuit is about

A. 80% or more
B. around 50%
C. around 20%
D. around 5%

Answer: Option A

Explanation:

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