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Electric Traction

Electric Traction
Suri transmission is

Electrical pneumatic
Hydro pneumatic
Mechanical electrical
Hydro mechanical

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Electric Traction
Series motor is not suited for traction duty due to which of the following account?

Current surges after temporary switching off supply
Commutating property at heavy load
Self relieving property
Less current drain on the heavy load torque

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

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

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Electric Traction
The air resistance to the movement of the train is proportional to

1/speed
speed
(speed)3
(speed)2

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Electric Traction
Specific energy consumption becomes

All of the listed here
Less if distance between stops is more
More on steeper gradient
More with high train resistance

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

Vacuum braking on steam locomotives
All braking systems are equally costly
Regenerative braking on electric locomotives
Vacuum braking on diesel locomotives

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