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Electric Traction

Electric Traction
The value of coefficient of adhesion will be high when rails are

Wet
Cleaned with sand
Sprayed with oil
Greased

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Electric Traction
The resistance encountered by a train in motion is on account of

Resistance offered by air
Friction at various parts of the rolling stock
Friction at the track
All of the listed here

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

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

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Electric Traction
Long distance railways use which of the following?

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

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Electric Traction
Main traction systems used in India are, those using

Steam engine locomotives
Electric locomotives
All of the listed here
Diesel engine locomotives

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Electric Traction
The overall efficiency of steam locomotive is around

35 to 45 percent
5 to 10 percent
25 to 35 percent
15 to 20 percent

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