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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. In a glass bulb mercury arc rectifier the maximum current rating is restricted to
2. .44. In a phase-shift control method, the phase shift between anode and grid voltages can be achieved by means of
3. It is the_______of the transformer on which the magnitude of angle of overlap depends.
4. In a rotary converter I2R losses as compared to a D.C. generator of the same size will be
5. The efficiency of the copper oxide rectifier seldom exceeds
6. The cathdde voltage drop, in a mercury arc rectifier, is due to
7. The internal efficiency of a mercury arc rectifier depends on
8. The potential drop in the arc, in a mercury arc rectifier, varies
9. A rotary converter combines the function of
10. 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.
11. A rotary converter combines the function of
12. Selenium rectifier can be operated at temperatures as high as
13. Which of the following methods may be used to convert A.C. system toD.C. ?
14. Which of the following mercury arc rectifier will deliver least undulating current?
15. Which of the following is the loss within the mercury arc rectifier chamber ?
16. Which of the following AC. motors is usually used in large motor-generator sets?
17. In mercury arc rectifiers having grid, the arc can be struck between anode and cathode only when the grid attains a certain potential, this potential being known as
18. In which of the following appUcations, direct current is absolutely essential ?
19. Ageing of a selenium rectifier may change the output voltage by
20. A commutating rectifier consists of commutator driven by
21. The ionization potential of mercury is approximately
22. When a rectifier is loaded which of the following voltage drops take place ?
23. Copper oxide rectifier is usually designed not to operate above
24. In which of the following equipment direct current is needed ?
25. In selenium rectifiers efficiencies ranging from ______ to ______ percent are attainable

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