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Electric Traction

Electric Traction
The speed of a superfast train is

75 kmph
60 kmph
100 kmph
More than 100 kmph

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Electric Traction
If the coefficient of adhesion on dry rails is 0.26, which of the following could be the value for wet rails?

0.46
0.26
0.16
0.35

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Electric Traction
Which of the following is an advantage of electric traction over other methods of traction?

Better braking action
All of the listed here
Faster acceleration
No pollution problems

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Electric Traction
The braking retardation is usually in the range

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

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Electric Traction
When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when

Wheel base of axles is more
Both of the listed here
None of the listed here
Degree of curvature is more

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

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

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