Practice question

What is the function of the EGR (Exhaust Gas Recirculation) valve in a vehicle's engine?

  1. To increase engine horsepower during hard acceleration
  2. To recirculate a portion of exhaust gases back into the engine cylinders to lower combustion temperatures and reduce nitrogen oxide (NOx) emissions
  3. To filter carbon particles from the exhaust gas stream
  4. To deliver extra oxygen directly to the catalytic converter

Answer: B — To recirculate a portion of exhaust gases back into the engine cylinders to lower combustion temperatures and reduce nitrogen oxide (NOx) emissions

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