CTE Emissions Control & Environmental Compliance 3

Question 1

A stored DTC P0420 indicates a problem with which emissions system?

Accepted Answer

Catalytic converter efficiency below threshold (Bank 1)

Answer

P0420 is a generic OBD-II code indicating that the catalytic converter on Bank 1 is operating below its required efficiency threshold.

Question 2

Which Clean Air Act amendment greatly expanded the EPA's authority to regulate hazardous air pollutants and set technology-based standards for major sources?

Accepted Answer

The 1990 Clean Air Act Amendments

Answer

The 1990 Clean Air Act Amendments significantly strengthened the EPA's authority, adding Title III for hazardous air pollutants and mandating stricter vehicle and stationary source standards.

Question 3

In a CTE automotive program, proper disposal of used motor oil is required because improper disposal can result in which consequence?

Accepted Answer

Contamination of groundwater and soil, violating environmental regulations

Answer

Used motor oil contains heavy metals and hydrocarbons that can contaminate groundwater and soil, making improper disposal a violation of EPA and state environmental regulations.

Question 4

What is the primary purpose of a NOx sensor in a diesel selective catalytic reduction (SCR) system?

Accepted Answer

Provide feedback to the ECU on NOx levels before and after the SCR catalyst

Answer

NOx sensors before and after the SCR catalyst allow the ECU to monitor reduction efficiency and adjust DEF injection accordingly.

Question 5

Which refrigerant was phased out of automotive air conditioning systems in the U.S. due to its ozone-depleting properties under the Montreal Protocol?

Accepted Answer

R-12 (Freon)

Answer

R-12 (Freon, CFC-12) was phased out because it depletes the ozone layer; automotive systems transitioned to R-134a by 1996 and are now moving toward R-1234yf.

(CTE) Certified Teacher Career and Technical Education Practice Test

(CTE) Certified Teacher Career and Technical Education Practice Test

CTE Emissions Control & Environmental Compliance 3