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Electric Traction - Interview Questions and Answers

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41. The air resistance to the movement of the train is proportional to
A. speed
B. (speed)
C. (speed)
D. 1/speed
Explanation:
42. Vacuum is created by which of the following?
A. Vacuum pump
B. Ejector
C. Any of the above
D. None of the above
Explanation:
43. Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction ?
A. Reduced current method
B. Tap changing control of transformer
C. Series parallel operation of motors
D. All of the above
Explanation:
44. Which of the following happens in Kando system ?
A. Three phase A.C. is converted into D.C.
B. Single phase A.C. is converted into D.C.
C. Single phase supply is converted into three phase system
D. None of the above
Explanation:
45. Automatic signalling is used for which of the following trains ?
A. Mail and express trains
B. Superfast trains
C. Suburban and Urban electric trains
D. All trains
Explanation:
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