Define DC traction and provide an example.

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Multiple Choice

Define DC traction and provide an example.

Explanation:
DC traction means a railway propulsion system that is powered by direct current fed to the traction motors, typically available through overhead lines or a third rail. This setup is common in urban rail because DC motors provide strong starting torque and straightforward control for frequent stop-and-go service. An example is 750 V DC used in many metro networks. Other options describe different systems: alternating current traction uses AC supply, while converting DC to AC is just a conversion step and not the traction type itself. A system that uses only alternating current would be AC traction, not DC traction.

DC traction means a railway propulsion system that is powered by direct current fed to the traction motors, typically available through overhead lines or a third rail. This setup is common in urban rail because DC motors provide strong starting torque and straightforward control for frequent stop-and-go service. An example is 750 V DC used in many metro networks.

Other options describe different systems: alternating current traction uses AC supply, while converting DC to AC is just a conversion step and not the traction type itself. A system that uses only alternating current would be AC traction, not DC traction.

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