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Rectifiers and Converters - Interview Questions and Answers

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21. When a rectifier is loaded which of the following voltage drops take place ?
A. Voltage drop in transformer reactance
B. Voltage drop in resistance of transformer and smoothing chokes
C. Arc voltage drop
D. All of the above
Explanation:
22. In a glass bulb mercury arc rectifier the maximum current rating is restricted to
A. 2000 A
B. 1500 A
C. 1000 A
D. 500 A
Explanation:
23. To produce cathode spot in a mercury arc rectifier
A. anode is heated
B. tube is evacuated
C. an auxiliary electrode is used
D. low mercury vapour pressures are used
Explanation:
24. Which of the following is the loss within the mercury arc rectifier chamber ?
A. Voltage drop in arc
B. Voltage drop at the anode
C. Voltage drop at the cathode
D. All of the above
Explanation:
25. Copper oxide rectifier is usually designed not to operate above
A. 10�C
B. 20�C
C. 30�C
D. 45�C
Explanation:
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