Electric Traction
Coefficient of adhesion is

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
All of the listed here

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

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

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