Electronics and Communication Engineering - Power Electronics

46. 

In a half bridge inverter, the freewheeling diodes are needed

A. even when load is resistive
B. only when load is inductive
C. only when load is inductive or capacitive
D. for all types of loads

Answer: Option C

Explanation:

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47. 

When a thyristor is conducting, the voltage drop across it

A. is absolutely constant
B. decreases with increase in load current
C. increases slightly with increase in load current
D. none of the above

Answer: Option C

Explanation:

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48. 

The advantage of modified series inverter with two inductors and two capacitors is

A. the intermittent operation of battery is avoided
B. efficiency of circuit is more
C. the output frequency is low
D. all of the above

Answer: Option A

Explanation:

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49. 

An SUS is

A. exactly similar to SCR but with higher rating
B. similar to UJT
C. PUT and avalanche diode connected in anti parallel
D. SCR and avalanche diode connected in parallel

Answer: Option C

Explanation:

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50. 

Which chopper circuit operates in quadrants 1 and 4?

A. A
B. B
C. D
D. E

Answer: Option C

Explanation:

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