Power Electronics 2
Switching Characteristics of Power Electronics Devices
- 1.
Switching frequency of a power electronic devise is mostly affected by:
- A.
Reverse recovery charge
- B.
Turn off time
- C.
Source inductance
- D.
Load inductance
Correct Answer(s)
A. Reverse recovery charge
B. Turn off timeExplanation
It is affected mainly by the reverse recovery charge and there by the turn off timeRate this question:
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- 2.
Initially @ t=0
- V=Vmax, I=0
- V=Vmax, I=Imax
- V=0, I=Imax
- A.
Turn off, Energy loss is VI(t1+t2)/2
- B.
Turn on, Energy loss is VI(t1+t2)/2
- C.
Turn off, Energy loss is VI(t1+t2)
- D.
Turn on, Energy loss is VI(t1+t2)
Correct Answer
B. Turn on, Energy loss is VI(t1+t2)/2 - 3.
Maximum firing angle possible in an RC firing circuit is
- A.
90
- B.
180
- C.
360
- D.
Depends on load
Correct Answer
B. 180 -
- 4.
Which of the following is/are voltage commutation
- A.
Class B
- B.
Class C
- C.
Class D
- D.
Class F
Correct Answer(s)
B. Class C
C. Class D -
- 5.
Which of the following is a manufacturer specified Thyristor rating
- A.
Maximum RMS anode current
- B.
Maximum average anode current rating
- C.
Surge current rating
- D.
All of the above
Correct Answer
A. Maximum RMS anode current -
- 6.
Thyristor can turn OFF by which of the following NOTE: many answers may exist
- A.
Decreasing gate current below latching current
- B.
Decreasing anode current below latching current
- C.
Applying reverse voltage across the thyristor
- D.
By removing gate signal
Correct Answer
C. Applying reverse voltage across the thyristor -
- 7.
If drift region region in a power devise is increased, then NOTE: many answers may exist
- A.
Reverse blocking capability increases
- B.
Forward conduction losses increases
- C.
Forward conduction losses doesn't change but reverse blocking capacity increases
- D.
No drift region is present in a power semi conductor devise
Correct Answer(s)
A. Reverse blocking capability increases
B. Forward conduction losses increases -
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Current Version
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Feb 20, 2013Quiz Edited by
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Aug 01, 2012Quiz Created by
Viplavchaitanya
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