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Electric Traction

Electric Traction
Which of the following is the voltage for single phase A.C. system?

220 v
220 V
11 kV
5 kV

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Electric Traction
For given maximum axle load tractive efforts of AC. locomotive will be

More than that of D.C. locomotive
Equal to that of D.C. locomotive
Less than that of D.C. locomotive
None of the listed here

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Electric Traction
The overall efficiency of steam locomotive is around

25 to 35 percent
15 to 20 percent
5 to 10 percent
35 to 45 percent

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

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

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Electric Traction
The rate of acceleration on suburban or urban service is in the range

15 to 25 km phps
5 to 10 km phps
1.6 to 4.0 km phps
0.2 to 0.5 km phps

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Electric Traction
The rate of acceleration on sub-urban or urban services is restricted by the consideration of

Passenger Discomfort
Track size
Track curves
Engine power

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