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

All of the listed here
Acceleration
Work against gravity while moving up the gradient
Work against the resistance to motion

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

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

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