CTE Emissions Control & Environmental Compliance 2

Question 1

Which federal agency is primarily responsible for setting and enforcing vehicle emissions standards in the United States?

Accepted Answer

EPA

Answer

The Environmental Protection Agency (EPA) sets and enforces vehicle emissions standards under the Clean Air Act.

Question 2

What does the acronym 'OBD-II' stand for in the context of emissions diagnostics?

Accepted Answer

On-Board Diagnostics, second generation

Answer

OBD-II (On-Board Diagnostics, second generation) is a standardized system mandated in 1996 that monitors vehicle emissions and engine performance.

Question 3

A vehicle fails an emissions test because of excessive HC (hydrocarbon) emissions at idle. Which component is MOST likely at fault?

Accepted Answer

Clogged fuel injectors

Answer

Clogged fuel injectors cause incomplete combustion, leading to elevated unburned hydrocarbon emissions at idle.

Question 4

Under EPA Tier 3 vehicle emissions standards, which pollutant standard was significantly tightened compared to Tier 2?

Accepted Answer

Particulate matter (PM) and nitrogen oxides (NOx)

Answer

EPA Tier 3 substantially lowered allowable particulate matter and NOx emissions, aligning U.S. standards more closely with California's LEV III rules.

Question 5

What is the primary function of a diesel particulate filter (DPF)?

Accepted Answer

Trap and oxidize soot particles from diesel exhaust

Answer

A diesel particulate filter captures soot particles from exhaust and periodically burns them off during regeneration to reduce PM emissions.

(CTE) Certified Teacher Career and Technical Education Practice Test

(CTE) Certified Teacher Career and Technical Education Practice Test

CTE Emissions Control & Environmental Compliance 2