Electric Traction
Tractive effort is required to

Overcome the gravity component of train mass
Overcome friction, windage and curve resistance
All of the listed here
Accelerate the train mass

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Electric Traction
Coefficient of adhesion is

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

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