Q. For 3 phase rotary converters, when power factor is unity. the ac line to dc current ratio is
✅ Correct Answer: (D)
0.942.
Power Electronics MCQs | Page - 5
Dear candidates you will find MCQ questions of Power Electronics here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.
Q. In an arc rectifier the drop in voltage at the cathode is approximately
✅ Correct Answer: (B)
6 to 7 volts
Q. In arc rectifiers mercury is chosen as the liquid for rectifier because
✅ Correct Answer: (D)
all of the above.
Q. Ionization potential of mercury is approximately
✅ Correct Answer: (C)
10.4 V
Q. Least undulating current will be delivered by which mercury arc rectifier
✅ Correct Answer: (D)
6 phase.
Q. In a mercury arc rectifier the cathode voltage drop is due to
✅ Correct Answer: (B)
expenditure of energy in liberating electrons from the mercury
Q. In mercury arc rectifier, voltage drop at anode is due to
✅ Correct Answer: (A)
energy spent in overcoming the electrostatic field
Q. The average life of the glass bulb rectifier is
✅ Correct Answer: (C)
10,000 to 15,000 hours
Q. The vacuum inside the glass bulb of a mercury arc rectifier is of the order of
✅ Correct Answer: (C)
5 x 10-5 cm of Hg
Q. Which device can be used in a chopper circuit?
✅ Correct Answer: (D)
All of the mentioned
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