Electronics and Communication Engineering - Power Electronics

26. 

An SCR is triggered at 80° in the positive half cycle, only. The rms anode current is 25 A. If the firing angle is changed to 160°, the rms current is likely to be

A. 25 A
B. 12.5 A
C. less than 25 A
D. less than 12.5 A

Answer: Option D

Explanation:

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

27. 

The output wave of a cycloconverter consists of a number of segments derived from the input wave.

A. True
B. False

Answer: Option A

Explanation:

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

28. 

A class A chopper has an input voltage of 200 V. Ton = 1.5 ms and Toff = 4.5 ms. The duty cycle, average output voltage and ripple factor respectively are

A. 0.5, 100 V and 1
B. 0.25, 50 V and 3
C. 0.25, 50 V and 1
D. 0.5, 100 V and 3

Answer: Option B

Explanation:

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

29. 

In a parallel inverter the turn off time tq of thyristor and values of commutating elements L and C are related as

A. tq = pLC
B. tq = LC
C. tq = LC
D. tq = LC

Answer: Option C

Explanation:

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

30. 

A TRIAC can be turned on :

A. by applying a positive signal to gate
B. by applying a negative signal to gate
C. by applying either positive or negative signal to gate
D. none of the above

Answer: Option C

Explanation:

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