Electric Traction
Which of the following braking systems is used on steam locomotives?

None of the listed here
Pneumatic system
Hydraulic system
Vacuum system

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

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Electric Traction
Coefficient of adhesion is

All of the listed here
Equal in both AC. and D.C. traction
High in case of D.C. traction than in the case of AC. traction
Low in case of D.C. traction than in the case of AC. traction

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