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Electric Traction

Electric Traction
_________ locomotive has the highest operational availability.

All of the listed here
Electric
Steam
Diesel

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Electric Traction
Series motor is not suited for traction duty due to which of the following account?

Self relieving property
Less current drain on the heavy load torque
Commutating property at heavy load
Current surges after temporary switching off supply

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Electric Traction
________ have maximum unbalanced forces.

Electric locomotives
Steam locomotives
Diesel locomotives
All of the listed here

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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
Pole changing
Combination of cascade and pole changing
Rheostat control

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Electric Traction
Long distance railways use which of the following?

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

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Electric Traction
When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when

Degree of curvature is more
Wheel base of axles is more
None of the listed here
Both of the listed here

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