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All C licence questions · DGT question bank

On which assembly does a lorry’s eddy-current electromagnetic retarder act?

Correct answer

On the driveline.

On the driveline: it generates resisting torque that slows the rotating shaft. It does not act directly on every axle’s pneumatic brake cylinders or replace the service brakes. Installation depends on the model: it may be in the driveline or alongside the gearbox output or drive axle. It is not a mechanism installed inside wheel-brake discs or drums.

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  • Inside the wheel-brake discs.

  • Inside the wheel-brake drums.

  • On the driveline.

The real exam in English is a translation of the Spanish original; compare both here.

Show the Spanish original

¿En qué conjunto actúa un ralentizador electromagnético de corrientes de Foucault de un camión?

  1. Dentro de los discos de los frenos de rueda.
  2. En la transmisión.(Correct answer)
  3. Dentro de los tambores de los frenos de rueda.

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