Exercise: Power Electronics

Questions for: Power Electronics

If 0.5 T is the time period of oscillations and Toff is the time between turn off of one thyristor and turn on of second thyristor, the frequency of output f of a series inverter is
A:
B:
C:
D:
Answer: A
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The difference between resonant commutation and self commutation is
A:
both these methods are based on entirely different principles
B:
in resonant commutation, the commutating elements carry load current but in self commutation, the commutating elements do not carry load current
C:
resonant commutation uses L and C but self commutation uses only capacitor
D:
none of the above
Answer: A
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A chopper is a high efficiency circuit.
A:
True
B:
False
C:
D:
Answer: A
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A cycloconverter for single phase operation has
A:
one positive group and one negative group converters
B:
two positive group and two negative group converters
C:
three positive group and three negative group converters
D:
any of the above
Answer: A
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A single phase half wave rectifier is feeding a resistive load. As firing angle is increased
A:
dc output voltage and rms output voltage decrease in the same proportion
B:
dc output voltage and rms output voltage decrease
C:
dc output voltage and rms output voltage increase
D:
dc output voltage and rms output voltage increase in the same proportion
Answer: B
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