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Electric Traction

Electric Traction
The braking retardation is usually in the range

15 to 30 km phps
3 to 5 km phps
0.15 to 0.30 km phps
5 to 8 km phps

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Electric Traction
Quadrilateral speed-time curve pertains to which of the following services?

Suburban service
Urban and suburban service
Urban service
Main line service

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Electric Traction
Energy consumption in propelling the train is required for which of the following?

Acceleration
Work against the resistance to motion
All of the listed here
Work against gravity while moving up the gradient

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

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

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Electric Traction
In case of a steam engine an average coal consumption per km is nearly

150 to 175 kg
60 to 80 kg
100 to 120 kg
28 to 30 kg

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Electric Traction
Coefficient of adhesion reduces due to the presence of which of the following?

Both Dew on rails and Oil on the rails
Sand on rails
Oil on the rails
Dew on rails

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