Practice question

What is the function of the AdBlue (Diesel Exhaust Fluid / DEF) selective catalytic reduction (SCR) system on modern Euro 5 and Euro 6 heavy diesel trucks?

  1. Injects urea solution into the exhaust stream to break down harmful nitrogen oxides (NOx) into harmless nitrogen and water vapor
  2. Increases diesel fuel cetane rating inside the fuel tank
  3. Lubricates the pneumatic air compressor piston rings
  4. Cleans the windshield washer reservoir

Answer: A — Injects urea solution into the exhaust stream to break down harmful nitrogen oxides (NOx) into harmless nitrogen and water vapor

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