Electric Traction
Coefficient of adhesion reduces due to the presence of which of the following?

Sand on rails
Oil on the rails
Both Dew on rails and Oil on the rails
Dew on 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
All of the listed here
High in case of D.C. traction than in the case of AC. traction
Equal in both AC. and D.C. traction

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