Electronics and Communication Engineering - Power Electronics

16. 

When a power diode is conducting, the voltage drop across it is about

A. I V
B. 5 V
C. 20 V
D. 50 V

Answer: Option A

Explanation:

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17. 

In thermal ohm's law, temperature and power loss are analogous to

A. V and I respectively of ohm's law
B. I and V respectively of ohm's law
C. R and V respectively of ohm's law
D. I and R respectively of ohm's law

Answer: Option B

Explanation:

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18. 

A string of series connected thyristors needs equalising circuit to

A. ensure proper firing
B. ensure proper current division
C. ensure proper voltage division
D. none of the above

Answer: Option C

Explanation:

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19. 

A surge voltage

A. has very high magnitude and very long duration
B. has very high magnitude and very small duration
C. has very high magnitude and very small duration and can be positive or negative
D. can be only positive

Answer: Option C

Explanation:

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20. 

The minimum gate current which can turn on SCR is called :

A. trigger current
B. holding current
C. junction current
D. breakover current

Answer: Option A

Explanation:

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