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Electric Traction

Electric Traction
The normal value of adhesion friction is

0.25
0.50
0.30
0.35

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Electric Traction
_________ frequency is not common in low frequency traction system

16 Hz
40 Hz
None of the listed here
25 Hz

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Electric Traction
In case of steam engines the steam pressure is

5 to 8 kgf/cm²
25 to 35 kgf/cm²
1 to 4 kgf/cm²
10 to 15 kgf/cm²

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

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

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Electric Traction
The overall efficiency of steam locomotive is around

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

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Electric Traction
Power for lighting in passenger coach, in a long distance electric train, is provided

Directly through overhead electric line
Through rails
Through individual generator of bogie and batteries
Through locomotive

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