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Electric Traction

Electric Traction
Suri transmission is

Mechanical electrical
Hydro mechanical
Electrical pneumatic
Hydro pneumatic

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Electric Traction
The normal value of adhesion friction is

0.50
0.30
0.25
0.35

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Electric Traction
Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction?

Series parallel operation of motors
All of the listed here
Tap changing control of transformer
Reduced current method

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Electric Traction
Long distance railways use which of the following?

25 kV two phase A.C.
25 kV single phase A.C.
25 kV three phase A.C.
200 V D.C.

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Electric Traction
Which of the following is an advantage of electric traction over other methods of traction?

No pollution problems
Faster acceleration
All of the listed here
Better braking action

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Electric Traction
The specific energy consumption of a train depends on which of the following?

Acceleration and retardation
Distance covered
All of the listed here
Gradient

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