Electronics and Communication Engineering - Power Electronics

41. 

As compared to a p-n junction diode

A. a schottky diode has lower cut in voltage and lower reverse saturation current
B. a schottky diode has higher cut in voltage and higher reverse saturation current
C. a Schottky diode has lower cut in voltage and higher reverse saturation current
D. a schottky diode has higher cut in voltage and lower reverse saturation current

Answer: Option C

Explanation:

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42. 

From which instant is the turn off time of a thyristor defined

A. when anode voltage becomes zero
B. when anode current becomes zero
C. when both anode voltage and current become zero
D. none of the above

Answer: Option B

Explanation:

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43. 

In a single phase cycloconverter with centre tapped transformer

A. all thyristors carry currents for equal duration
B. the durations of currents in all thyristors may or may not be equal
C. the durations of currents in all thyristors cannot be equal
D. the duration of currents in all thyristors must be equal for satisfactory operation

Answer: Option B

Explanation:

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44. 

If Ar and Ac are the amplitudes of reference and control signals, the modulation index M is

A.
B.
C.
D.

Answer: Option A

Explanation:

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45. 

Thyristors can be used for control of

A. dc separately excited motor
B. dc shunt motor
C. dc series motor
D. all of the above

Answer: Option D

Explanation:

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