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Electric Traction

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

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

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Electric Traction
Coefficient of adhesion reduces due to the presence of which of the following?

Both Dew on rails and Oil on the rails
Sand on rails
Oil on the rails
Dew on rails

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

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

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Electric Traction
In case of locomotives the tractive power is provided by

Double cylinder, double acting steam engine
Single stage steam turbine
Double cylinder, single acting steam engine
Single cylinder double acting steam engine

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Electric Traction
Electric locomotives in India are manufactured at

Jamalpur
Chittaranjan
Gorakhpur
Bangalore

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Electric Traction
The normal value of adhesion friction is

0.35
0.50
0.25
0.30

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