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Electronics and Communication Engineering - Power Electronics

Exercise : Power Electronics - Section 1
26.
Current derating may be necessary when thyristors are operating in
series
parallel
series or parallel
none of the above
Answer: Option
Explanation:

Since current does not divide equally, current derating is necessary.

27.
If duty cycle is a and the load is a resistance R, the rms value of output voltage is
aV
a V
a2V
Answer: Option
Explanation:

RMS output voltage

VL = a V.

28.
For a BJT a = 0.98, then β =
0.02
0.5
4.9
49
Answer: Option
Explanation:

29.

Assertion (A): Power transistor has lower switching time than SCR

Reason (R): Power transistor has greater switching time than SCR

Both A and R are correct and R is correct explanation of A
Both A and R correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct
Answer: Option
Explanation:

Power transistor does not have high rating.

30.
A 3 kV circuit uses SCR of 800 V rating. If derating is 25%, the number of SCRs in series is
4
5
6
8
Answer: Option
Explanation:

.

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