NCED Emissions Control & Environmental Compliance 3

Question 1

A catalytic converter reaches light-off temperature at approximately what degree Fahrenheit during cold start?

Accepted Answer

400–600°F

Answer

Catalytic converters become effective (reach light-off) at roughly 400–600°F, which is why cold-start emissions are highest before the catalyst warms up.

Question 2

Which Clean Air Act section established the Acid Rain Program targeting SO2 and NOx reductions from power plants?

Accepted Answer

Title IV

Answer

Title IV of the 1990 Clean Air Act Amendments created the Acid Rain Program with a cap-and-trade approach to reduce SO2 and NOx emissions from electric utilities.

Question 3

A technician notices a vehicle's exhaust smells strongly of rotten eggs (hydrogen sulfide). This odor most likely indicates:

Accepted Answer

A failing catalytic converter unable to convert H2S from sulfur in fuel

Answer

A sulfur or rotten-egg odor indicates the catalytic converter is not properly converting hydrogen sulfide produced from sulfur compounds in gasoline.

Question 4

Which EPA program requires facilities that use, store, or release extremely hazardous substances above threshold quantities to submit Risk Management Plans (RMPs)?

Accepted Answer

CAA Section 112(r)

Answer

CAA Section 112(r) requires facilities with extremely hazardous substances above threshold quantities to develop and submit Risk Management Plans to prevent accidental releases.

Question 5

What does the lambda (λ) value of 1.0 represent in engine emissions management?

Accepted Answer

Stoichiometric air-fuel ratio (perfect combustion balance)

Answer

Lambda = 1.0 represents the stoichiometric air-fuel ratio (14.7:1 for gasoline), where the ideal balance exists for the three-way catalytic converter to reduce all three major pollutants.

(NCED) Nationally Certified Educational Diagnostician Practice Test

(NCED) Nationally Certified Educational Diagnostician Practice Test

NCED Emissions Control & Environmental Compliance 3