Electric Traction
Energy consumption in propelling the train is required for which of the following?

Work against the resistance to motion
Acceleration
Work against gravity while moving up the gradient
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?

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

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Electric Traction
Coefficient of adhesion is

All of the listed here
Low in case of D.C. traction than in the case of AC. traction
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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