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ELECTRIC TRACTION

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
0.35
0.16

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

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

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Electric Traction
In tram ways which of the following motors is used?

AC. single phase capacitor start motor
A.C. three phase motor
D.C. series motor
D.C. shunt motor

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Electric Traction
Which of the following drives is suitable for mines where explosive gas exists?

Diesel engine
Steam engine
Battery locomotive
All of the listed here

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Electric Traction
Overload capacity of diesel engines is usually restricted to

8 percent
4 percent
2 percent
6 percent

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