Electronics and Communication Engineering - Power Electronics

21. 

In a certain inverter circuit each thyristor carries 26.67 A for 60°, 13.33 A for 120° and zero A for 180° of the cycle. The rms current of thyristor is

A. 20 A
B. 13.33 A
C. 6.67 A
D. 3.33 A

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

22. 

The factor η for a UJT is about

A. 0.1
B. 0.2
C. 0.6
D. 0.9

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

23. 

The symbol in figure is for

A. UJT
B. PUT
C. Shockley diode
D. TRIAC

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

24. 

In a single phase full converter fed by a source having inductance, the number of thyristors conducting during overlap is

A. 1
B. 2
C. 3
D. 4

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

25. 

The cut in voltages for germanium and silicon diodes respectively as

A. 0.3 V and 0.7 V
B. 0.7 V and 0.3 V
C. 0.6 V and 0.9 V
D. 0.5 V and 0.7 V

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.