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

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

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