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Electric Traction

Electric Traction
The coasting retardation is around

3.6 km phps
2.6 km phps
1.6 km phps
0.16 km phps

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

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

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Electric Traction
Vacuum is created by which of the following?

Any of the listed here
None of the listed here
Vacuum pump
Ejector

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Electric Traction
For three-phase induction motors which of the following is the least efficient method of speed control?

Rheostat control
Combination of cascade and pole changing
Pole changing
Cascade control

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Electric Traction
For 25 kV single phase system power supply frequency is

60 Hz
50 Hz
25 Hz
100 Hz

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Electric Traction
Specific energy consumption becomes

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

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