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Electric Traction

Electric Traction
The air resistance to the movement of the train is proportional to

(speed)3
1/speed
speed
(speed)2

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Electric Traction
For 25 kV single phase system power supply frequency is

100 Hz
50 Hz
60 Hz
25 Hz

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Electric Traction
Speed-time curve of main line service differs from those of urban and suburban services on following account

Accelerating and braking periods are comparatively smaller
It has longer coasting period
All of the listed here
It has longer free running period

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Electric Traction
Long distance railways use which of the following?

25 kV single phase A.C.
25 kV three phase A.C.
200 V D.C.
25 kV two phase A.C.

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Electric Traction
The friction at the track is proportional to

None of the listed here
Speed
1/speed
1/(speed)²

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Electric Traction
The rate of acceleration on suburban or urban service is in the range

15 to 25 km phps
0.2 to 0.5 km phps
5 to 10 km phps
1.6 to 4.0 km phps

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