EPA 609 FINAL EXAM REVIEW 100
QUESTIONS WITH ACCURATE
SOLUTIONS AND RATED A+.
1. What is the primary purpose of the EPA 609 certification?
A. To allow technicians to work on stationary refrigeration systems
B. To permit the purchase and handling of refrigerants for MVAC (Motor Vehicle Air
Conditioning) systems
C. To regulate automotive emissions
D. To establish safety standards for air conditioning repair shops
Answer: B. To permit the purchase and handling of refrigerants for MVAC (Motor
Vehicle Air Conditioning) systems
Explanation: The EPA 609 certification is required for technicians who service or
repair motor vehicle air conditioning (MVAC) systems and handle refrigerants.
2. What type of refrigerant is commonly used in modern MVAC systems?
A. R-12
B. R-134a
C. R-22
D. R-410A
Answer: B. R-134a
Explanation: R-134a replaced R-12 in MVAC systems due to environmental
concerns over ozone depletion. Some newer vehicles use R-1234yf as an
alternative.
3. Which of the following refrigerants is considered an HFO (hydrofluoroolefin)?
A. R-134a
B. R-22
,C. R-1234yf
D. R-410A
Answer: C. R-1234yf
Explanation: R-1234yf is a hydrofluoroolefin (HFO) refrigerant with a lower
global warming potential (GWP) than R-134a and is used in many new vehicle air
conditioning systems.
4. Which refrigerant is classified as an ozone-depleting substance (ODS)?
A. R-1234yf
B. R-134a
C. R-12
D. R-744
Answer: C. R-12
Explanation: R-12 (CFC-12) is a chlorofluorocarbon (CFC) that contributes to
ozone depletion and was phased out under the Montreal Protocol.
5. What is the purpose of an MVAC refrigerant recovery machine?
A. To add refrigerant to an AC system
B. To remove and store refrigerant without releasing it into the atmosphere
C. To convert old refrigerant into new refrigerant
D. To change the pressure of the refrigerant
Answer: B. To remove and store refrigerant without releasing it into the
atmosphere
Explanation: Refrigerant recovery machines safely capture refrigerant during
MVAC servicing to prevent environmental damage.
6. Under EPA regulations, how much refrigerant can be legally vented to the
atmosphere?
A. Up to 1 pound
B. Up to 3 pounds
,C. Only R-134a can be vented
D. No amount of refrigerant can be vented
Answer: D. No amount of refrigerant can be vented
Explanation: Venting refrigerants is strictly prohibited under the Clean Air Act, as
it contributes to ozone depletion and climate change.
7. What should be done before opening an MVAC system for repairs?
A. Nothing, as long as the system is off
B. Refrigerant should be vented into the atmosphere
C. The system should be properly recovered using EPA-approved equipment
D. The refrigerant should be mixed with another refrigerant
Answer: C. The system should be properly recovered using EPA-approved
equipment
Explanation: Recovering refrigerant prevents environmental harm and is required
by EPA regulations.
8. What type of oil is used in an R-134a system?
A. Mineral oil
B. PAG (Polyalkylene Glycol) oil
C. Alkylbenzene oil
D. R-12 compressor oil
Answer: B. PAG (Polyalkylene Glycol) oil
Explanation: PAG oil is compatible with R-134a and is commonly used in MVAC
systems.
9. Why is R-1234yf considered more environmentally friendly than R-134a?
A. It has a lower ozone depletion potential (ODP)
B. It has a lower global warming potential (GWP)
C. It is a natural refrigerant
D. It is more efficient at cooling
, Answer: B. It has a lower global warming potential (GWP)
Explanation: R-1234yf has a GWP of 4, compared to R-134a’s GWP of 1,430,
making it a better environmental alternative.
10. What is the primary function of an MVAC accumulator or receiver-drier?
A. To store extra refrigerant
B. To remove moisture and contaminants from the refrigerant
C. To increase system pressure
D. To cool the refrigerant before entering the evaporator
Answer: B. To remove moisture and contaminants from the refrigerant
Explanation: Accumulators and receiver-driers contain desiccants that absorb
moisture and prevent damage to the AC system.
11. When should an MVAC system be leak-tested?
A. Only when refrigerant is low
B. Before charging a system with refrigerant
C. After the vehicle is in operation
D. Leak testing is not required
Answer: B. Before charging a system with refrigerant
Explanation: Checking for leaks ensures that no refrigerant is wasted and prevents
harmful emissions.
12. Which of the following refrigerants is a natural alternative with zero ozone
depletion potential (ODP)?
A. R-134a
B. R-12
C. R-744 (CO₂)
D. R-22
Answer: C. R-744 (CO₂)
Explanation: R-744 (carbon dioxide) is a natural refrigerant with no ODP and
very low GWP.
QUESTIONS WITH ACCURATE
SOLUTIONS AND RATED A+.
1. What is the primary purpose of the EPA 609 certification?
A. To allow technicians to work on stationary refrigeration systems
B. To permit the purchase and handling of refrigerants for MVAC (Motor Vehicle Air
Conditioning) systems
C. To regulate automotive emissions
D. To establish safety standards for air conditioning repair shops
Answer: B. To permit the purchase and handling of refrigerants for MVAC (Motor
Vehicle Air Conditioning) systems
Explanation: The EPA 609 certification is required for technicians who service or
repair motor vehicle air conditioning (MVAC) systems and handle refrigerants.
2. What type of refrigerant is commonly used in modern MVAC systems?
A. R-12
B. R-134a
C. R-22
D. R-410A
Answer: B. R-134a
Explanation: R-134a replaced R-12 in MVAC systems due to environmental
concerns over ozone depletion. Some newer vehicles use R-1234yf as an
alternative.
3. Which of the following refrigerants is considered an HFO (hydrofluoroolefin)?
A. R-134a
B. R-22
,C. R-1234yf
D. R-410A
Answer: C. R-1234yf
Explanation: R-1234yf is a hydrofluoroolefin (HFO) refrigerant with a lower
global warming potential (GWP) than R-134a and is used in many new vehicle air
conditioning systems.
4. Which refrigerant is classified as an ozone-depleting substance (ODS)?
A. R-1234yf
B. R-134a
C. R-12
D. R-744
Answer: C. R-12
Explanation: R-12 (CFC-12) is a chlorofluorocarbon (CFC) that contributes to
ozone depletion and was phased out under the Montreal Protocol.
5. What is the purpose of an MVAC refrigerant recovery machine?
A. To add refrigerant to an AC system
B. To remove and store refrigerant without releasing it into the atmosphere
C. To convert old refrigerant into new refrigerant
D. To change the pressure of the refrigerant
Answer: B. To remove and store refrigerant without releasing it into the
atmosphere
Explanation: Refrigerant recovery machines safely capture refrigerant during
MVAC servicing to prevent environmental damage.
6. Under EPA regulations, how much refrigerant can be legally vented to the
atmosphere?
A. Up to 1 pound
B. Up to 3 pounds
,C. Only R-134a can be vented
D. No amount of refrigerant can be vented
Answer: D. No amount of refrigerant can be vented
Explanation: Venting refrigerants is strictly prohibited under the Clean Air Act, as
it contributes to ozone depletion and climate change.
7. What should be done before opening an MVAC system for repairs?
A. Nothing, as long as the system is off
B. Refrigerant should be vented into the atmosphere
C. The system should be properly recovered using EPA-approved equipment
D. The refrigerant should be mixed with another refrigerant
Answer: C. The system should be properly recovered using EPA-approved
equipment
Explanation: Recovering refrigerant prevents environmental harm and is required
by EPA regulations.
8. What type of oil is used in an R-134a system?
A. Mineral oil
B. PAG (Polyalkylene Glycol) oil
C. Alkylbenzene oil
D. R-12 compressor oil
Answer: B. PAG (Polyalkylene Glycol) oil
Explanation: PAG oil is compatible with R-134a and is commonly used in MVAC
systems.
9. Why is R-1234yf considered more environmentally friendly than R-134a?
A. It has a lower ozone depletion potential (ODP)
B. It has a lower global warming potential (GWP)
C. It is a natural refrigerant
D. It is more efficient at cooling
, Answer: B. It has a lower global warming potential (GWP)
Explanation: R-1234yf has a GWP of 4, compared to R-134a’s GWP of 1,430,
making it a better environmental alternative.
10. What is the primary function of an MVAC accumulator or receiver-drier?
A. To store extra refrigerant
B. To remove moisture and contaminants from the refrigerant
C. To increase system pressure
D. To cool the refrigerant before entering the evaporator
Answer: B. To remove moisture and contaminants from the refrigerant
Explanation: Accumulators and receiver-driers contain desiccants that absorb
moisture and prevent damage to the AC system.
11. When should an MVAC system be leak-tested?
A. Only when refrigerant is low
B. Before charging a system with refrigerant
C. After the vehicle is in operation
D. Leak testing is not required
Answer: B. Before charging a system with refrigerant
Explanation: Checking for leaks ensures that no refrigerant is wasted and prevents
harmful emissions.
12. Which of the following refrigerants is a natural alternative with zero ozone
depletion potential (ODP)?
A. R-134a
B. R-12
C. R-744 (CO₂)
D. R-22
Answer: C. R-744 (CO₂)
Explanation: R-744 (carbon dioxide) is a natural refrigerant with no ODP and
very low GWP.
