Electric Traction
Due to which of the following coefficient of adhesion improves?

All of the listed here
Rust on the rails
Sand on the rails
Dust on the rails

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Electric Traction
Coefficient of adhesion is

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
High in case of D.C. traction than in the case of AC. traction

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