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

Diesel engine
Steam engine
All of the listed here
Battery locomotive

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Electric Traction
Locomotive having mono-motor bogies

Has better coefficient of adhesion
Are suited both for passenger as well as freight service
All of the listed here
Has better riding qualities due to the reduction of lateral forces

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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
High capital outlay in fixed installations beside route limitation
Interference with communication lines
Short time power failure interrupts traffic for hours

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