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

Diesel locomotives
Steam locomotives
Electric locomotives
All of the listed here

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Electric Traction
Coefficient of adhesion is

High in case of D.C. traction than in the case of AC. traction
Low in case of D.C. traction than in the case of AC. traction
Equal in both AC. and D.C. traction
All of the listed here

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