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Rectifiers and Converters - Interview Questions and Answers

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16. The ionization potential of mercury is approximately
A. 5.4 V
B. 8.4 V
C. 10.4 V
D. 16.4 V
Explanation:
17. A synchronous converter can be started
A. by means of a small auxiliary motor
B. from AC. side as induction motor
C. from D.C. side as D.C. motor
D. any of the above methods
Explanation:
18. Which of the following rectifiers are primarily used for charging of low voltage batteries from AC. supply ?
A. Mechanical rectifiers
B. Copper oxide rectifiers
C. Selenium rectifiers
D. Electrolytic rectifiers
Explanation:
19. The efficiency of the copper oxide rectifier seldom exceeds
A. 90 to 95%
B. 85 to 90%
C. 80 to 85%
D. 65 to 75%
Explanation:
20. The metal rectifiers, as compared to mercury arc rectifiers
A. operate on low temperatures
B. can operate on high voltages
C. can operate on heavy loads
D. give poor regulation
Explanation:
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