Practice question

In an 'active combination of road vehicles', how are the wheels of the semi-trailer driven?

  1. They are never driven; only passive combinations exist in the E bank
  2. They are coupled to the tractor's transmission, which transmits torque to them
  3. They are driven by a separate diesel engine mounted on the trailer roof
  4. They freewheel and are braked only by a rope

Answer: B — They are coupled to the tractor's transmission, which transmits torque to them

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