Electric Traction
Long distance railways use which of the following?

25 kV three phase A.C.
25 kV single phase A.C.
25 kV two phase A.C.
200 V D.C.

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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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