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Electric Traction

Electric Traction
In India diesel locomotives are manufactured at

Ajmer
Varanasi
Bangalore
Jamalpur

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

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

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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
Cascade control
Pole changing

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Electric Traction
Overload capacity of diesel engines is usually restricted to

2 percent
6 percent
8 percent
4 percent

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Electric Traction
Battery operated trucks are used in

Factories for material transportation
Narrow gauge traction
Steel mills
Power stations

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

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

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