Exercise: Power Electronics

Questions for: Power Electronics

In a half bridge inverter the gate pulses of the two thyristors have a phase displacement of
A:
60°
B:
90°
C:
120°
D:
180°
Answer: D
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A 3 phase fully controlled converter is a
A:
3 pulse converter
B:
6 pulse converter
C:
2 pulse converter
D:
12 pulse converter
Answer: B
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In a three phase series inverter, the firing frequency is
A:
three times output frequency
B:
six times output frequency
C:
twice the output frequency
D:
equal to output frequency
Answer: B
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Which statement is correct?
A:
BJT and MOSFET are current controlled devices
B:
BJT is voltage controlled and MOSFET is current controlled device
C:
BJT and MOSFET are voltage controlled devices
D:
BJT is current controlled and MOSFET is voltage controlled device
Answer: D
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In a single phase full wave controlled rectifier using centre tap transformer, the voltage across each half of secondary is Vm sin ωt. The peak inverse voltage is
A:
2 Vm
B:
Vm
C:
0.5 Vm
D:
0.25 Vm
Answer: A
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