Exercise: Power Electronics

Questions for: Power Electronics

Assertion (A): Thyristors can be used in controlled heating, excitation systems of alternators, speed control of motors and HVDC

Reason (R): A static var system using thyristors is very commonly used in high voltage ac systems.

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R correct but R is not correct explanation of A
C:
A is correct but R is wrong
D:
A is wrong but R is correct
Answer: B
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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: D
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If Ar and Ac are the amplitudes of reference and control signals, the modulation index M is
A:
B:
C:
D:
Answer: A
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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: B
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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: B
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