Electronics and Communication Engineering - Power Electronics

36. 

A cycloconverter is a group of controlled rectifiers.

A. True
B. False

Answer: Option A

Explanation:

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37. 

A single phase full wave regulator feeds a resistive load. The firing angle of thyristors is 90°. The input power factor is

A. 1
B. 0.707 lagging
C. 0.5 lagging
D. 0.2 lagging

Answer: Option B

Explanation:

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38. 

The leads in a TRIAC are denoted by

A. anode cathode, gate
B. T1 T2, gate
C. T1, T2, anode
D. T1, T2, T3

Answer: Option B

Explanation:

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39. 

A step down cycloconverter has an input frequency f. If it uses natural commutation, the output frequency

A. must be a sub-multiple of input frequency
B. can be any frequency
C. must be an even sub-multiple of input frequency
D. must be an odd sub-multiple of input frequency

Answer: Option A

Explanation:

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40. 

In a single phase full wave regulator, the rms current in each thyristors is Ir The run load current is equal to

A. 2Ir
B. 2 Ir
C. Ir
D.

Answer: Option B

Explanation:

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