Practice question

When connecting a tractor unit to a semitrailer, what are the two standard pneumatic coupling lines, and what is their color coding?

  1. Red line = Supply/Emergency line (napojni vod / stalni pritisak) | Yellow line = Service/Control line (upravljački vod)
  2. Red line = Electric lighting | Yellow line = Fuel supply
  3. Blue line = Service brake | Green line = Handbrake
  4. Black line = Air intake | White line = Exhaust line

Answer: A — Red line = Supply/Emergency line (napojni vod / stalni pritisak) | Yellow line = Service/Control line (upravljački vod)

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