RCO Training – Mechanical Practice Test

Dynamic Brakes are defined as?

A hydraulic system that accelerates the locomotive. A device that converts braking heat into electricity. A mechanism to provide a soft ride in curves. An electrical device that converts some of the energy developed by a moving locomotive into an effective retarding force.

Correct Answer:

An electrical device that converts some of the energy developed by a moving locomotive into an effective retarding force.

Explanation:

Dynamic braking uses the locomotive’s traction motors as generators. As the train slows, these motors generate electricity instead of driving the wheels, creating a braking torque that slows the locomotive. The produced electricity is then dissipated as heat in resistor banks (in many systems), though some setups can send energy back to the power supply. In short, it’s an electrical device that converts part of the locomotive’s moving energy into a retarding force to slow the train.

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