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Electric Traction

Electric Traction
The braking retardation is usually in the range

15 to 30 km phps
0.15 to 0.30 km phps
3 to 5 km phps
5 to 8 km phps

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Electric Traction
In tram ways which of the following motors is used?

D.C. series motor
AC. single phase capacitor start motor
D.C. shunt motor
A.C. three phase motor

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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
Pole changing
Cascade control
Combination of cascade and pole changing

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Electric Traction
Energy consumption in propelling the train is required for which of the following?

Acceleration
All of the listed here
Work against gravity while moving up the gradient
Work against the resistance to motion

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Electric Traction
For diesel locomotives the range of horsepower is

1000 to 2000
500 to 1000
1500 to 2500
2000 to 2500

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Electric Traction
The value of coefficient of adhesion will be high when rails are

Greased
Sprayed with oil
Wet
Cleaned with sand

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