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Electric Traction

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
In tram ways which of the following motors is used?

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

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Electric Traction
For which of the following locomotives the maintenance requirements are the least?

Electric locomotives
Steam locomotives
All of the listed here
Diesel locomotives

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Electric Traction
Which of the following braking systems on the locomotives is costly?

Vacuum braking on steam locomotives
Regenerative braking on electric locomotives
Vacuum braking on diesel locomotives
All braking systems are equally costly

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

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

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Electric Traction
In case of locomotives the tractive power is provided by

Single stage steam turbine
Double cylinder, double acting steam engine
Double cylinder, single acting steam engine
Single cylinder double acting steam engine

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