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Electrical Engineering - Rectifiers & Converters MCQs
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Electrical Engineering - Rectifiers & Converters MCQs
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25 Questions

1. The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?
2. The internal efficiency of a mercury arc rectifier depends on
3. In which of the following equipment direct current is needed ?
4. .44. In a phase-shift control method, the phase shift between anode and grid voltages can be achieved by means of
5. Copper oxide rectifier is usually designed not to operate above
6. In a glass bulb mercury arc rectifier the maximum current rating is restricted to
7. To produce cathode spot in a mercury arc rectifier
8. In a mercury arc rectifier characteristic blue luminosity is due to
9. It is the_______of the transformer on which the magnitude of angle of overlap depends.
10. The cathdde voltage drop, in a mercury arc rectifier, is due to
11. A commutating rectifier consists of commutator driven by
12. Ageing of a selenium rectifier may change the output voltage by
13. Which of the following rectifiers have been used extensively in supplying direct current for electroplating ?
14. In a mercury arc rectifier positive ions are attracted towards
15. In a rotary converter I2R losses as compared to a D.C. generator of the same size will be
16. When a rectifier is loaded which of the following voltage drops take place ?
17. Which of the following mercury arc rectifier will deliver least undulating current?
18. Selenium rectifier can be operated at temperatures as high as
19. The potential drop in the arc, in a mercury arc rectifier, varies
20. A rotary converter in general construction and design, is more or less like
21. In a mercury arc rectifier______ flow from anode to cathode
22. Which of the following are the applications of D.C. system ?
23. In a grid control of mercury arc rectifiers when the grid is made positive relative to cathode, then it the electrons on their may to anode.
24. Normally, which of the following is used, when a large-scale conversion from AC. to D.C. power is required ?
25. The potential drop in the arc, in a mercury arc rectifier, varies

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