Electrical Engineering : Electric Traction QUESTIONS AND ANSWERS :: part2 : 21 to 25
Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
21.The voltage used for suburban trains in D.C. system is usually |
| 12 V |
| 24 V |
| 220 V |
| 600 to 750 V |
22.Co-efficient of adhesion reduces due to the presence of which of the following ? |
| Sand on rails |
| Dew on rails |
| Oil on the rails |
| both (b) and (c) |
23.The air resistance to the movement of the train is proportional to |
| speed |
| (speed) |
| (speed) |
| 1/speed |
24.Vacuum is created by which of the following? |
| Vacuum pump |
| Ejector |
| Any of the above |
| None of the above |
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