Practice question

What is AdBlue / DEF (Diesel Exhaust Fluid / Urea acuosa al 32.5%) used for in Selective Catalytic Reduction (SCR) systems on modern heavy trucks in Chile?

  1. To cool the radiator
  2. It is injected into the exhaust stream ahead of the SCR catalyst to chemically convert harmful nitrogen oxides (NOx) into harmless nitrogen gas (N2) and water vapor
  3. To clean the windshield
  4. To lubricate the transmission

Answer: B — It is injected into the exhaust stream ahead of the SCR catalyst to chemically convert harmful nitrogen oxides (NOx) into harmless nitrogen gas (N2) and water vapor

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