Practice question

What are the two pneumatic air lines that connect a tractor truck to a semi-trailer?

  1. The Emergency/Supply line (usually red) and the Service line (usually blue)
  2. The Fuel feed line and the Coolant line
  3. The Turbo boost line and the Exhaust return line
  4. The Air conditioning line and the Horn line

Answer: A — The Emergency/Supply line (usually red) and the Service line (usually blue)

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