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Electric Traction

Electric Traction
Watt-hours per tonne km is usually the specific energy consumption for suburban services.

120-150
150-200
100-150
50 - 75

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Electric Traction
Specific energy consumption becomes

All of the listed here
Less if distance between stops is more
More on steeper gradient
More with high train resistance

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

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

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Electric Traction
The friction at the track is proportional to

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

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Electric Traction
Automatic signaling is used for which of the following trains?

Mail and express trains
Suburban and Urban electric trains
Superfast trains
All trains

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Electric Traction
In main line service as compared to urban and suburban service

Acceleration and retardation rates are low
Distance between the stops is more
Maximum speed reached is high
All of the listed here

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