Electric Traction
Speed-time curve of main line service differs from those of urban and suburban services on following account

All of the listed here
It has longer coasting period
It has longer free running period
Accelerating and braking periods are comparatively smaller

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

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Electric Traction
Coefficient of adhesion is

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

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