Electrical Engineering : Rectifiers And Converters QUESTIONS AND ANSWERS :: part2 : 11 to 15
Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
11.In a mercury arc rectifier______ flow from anode to cathode |
| ions |
| electrons |
| ions and electrons |
| any of the above |
12.In a mercury arc rectifier characteristic blue luminosity is due to |
| colour of mercury |
| ionization |
| high temperature |
| electron streams |
13.The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ? |
| They are mechanically strong |
| They do not require any voltage for filament heating |
| Both (a) and (b) |
| None of the above |
14.Which of the following rectifiers have been used extensively in supplying direct current for electroplating ? |
| Copper oxide rectifiers |
| Selenium rectifiers |
| Mercury arc rectifiers |
| Mechanical rectifiers |
15.Ageing of a selenium rectifier may change the output voltage by |
| 5 to 10 per cent |
| 15 to 20 per cent |
| 25 to 30 per cent |
| none of the above |
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