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Electric Traction

Electric Traction
Watt-hours per tonne km is usually the specific energy consumption for suburban services.

100-150
150-200
120-150
50 - 75

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Electric Traction
_________ frequency is not common in low frequency traction system

None of the listed here
25 Hz
40 Hz
16 Hz

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Electric Traction
The horsepower of steam locomotives is

500 to 1000
Up to 1500
1500 to 2000
2500 to 3000

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Electric Traction
The resistance encountered by a train in motion is on account of

All of the listed here
Resistance offered by air
Friction at the track
Friction at various parts of the rolling stock

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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 pulsating torque exerted by steam locomotives causes which of the following?

Pitching
All of the listed here
Jolting and skidding
Hammer blow

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