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

Acceleration
All of the listed here
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
Interference with communication lines
High capital outlay in fixed installations beside route limitation
Short time power failure interrupts traffic for hours

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