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

Oil on the rails
Both Dew on rails and Oil on the rails
Dew on rails
Sand on rails

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Electric Traction
Which of the following is the disadvantage of electric traction over other systems of traction?

High capital outlay in fixed installations beside route limitation
Interference with communication lines
Short time power failure interrupts traffic for hours
Corrosion problems in the underground pipe work

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Electric Traction
Coefficient of adhesion is

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

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