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Electric Traction

Electric Traction
_________ frequency is not common in low frequency traction system

25 Hz
None of the listed here
40 Hz
16 Hz

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Electric Traction
In case of steam engines the steam pressure is

25 to 35 kgf/cm²
10 to 15 kgf/cm²
1 to 4 kgf/cm²
5 to 8 kgf/cm²

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Electric Traction
The resistance encountered by a train in motion is on account of

Resistance offered by air
All of the listed here
Friction at the track
Friction at various parts of the rolling stock

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Electric Traction
The coasting retardation is around

2.6 km phps
1.6 km phps
0.16 km phps
3.6 km phps

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Electric Traction
In main line service as compared to urban and suburban service

Maximum speed reached is high
Distance between the stops is more
All of the listed here
Acceleration and retardation rates are low

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

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

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