Electric Traction
Which of the following drives is suitable for mines where explosive gas exists?

Steam engine
Battery locomotive
All of the listed here
Diesel engine

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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
High capital outlay in fixed installations beside route limitation
Corrosion problems in the underground pipe work
Interference with communication lines

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