Skillcat EPA 608 Newly Updated 2026/27
Exam Questions & Answers, 100%
Guaranteed Pass ||Complete A+ Guide
1. What is the primary environmental concern associated with the release of CFC refrigerants?
A. Formation of acid rain
B. Depletion of stratospheric ozone
C. Increased groundwater salinity
D. Increased nitrogen fixation
Correct Answer: B. Depletion of stratospheric ozone
Rationale: CFCs can release chlorine in the stratosphere when exposed to ultraviolet
radiation. Chlorine participates in chemical reactions that destroy ozone molecules. Ozone
depletion is therefore a major environmental concern addressed by Section 608. US EPA
2. Which international agreement established a framework for phasing out ozone-depleting
substances?
A. Kyoto Protocol
B. Montreal Protocol
C. Paris Agreement
D. Geneva Convention
Correct Answer: B. Montreal Protocol
Rationale: The Montreal Protocol is the international agreement governing the phaseout of
substances that deplete the stratospheric ozone layer. EPA's Section 608 test topics specifically
include the Montreal Protocol. US EPA
3. Which of the following is a CFC?
A. R-12
B. R-22
C. R-134a
D. R-410A
Correct Answer: A. R-12
,Rationale: R-12 is a chlorofluorocarbon (CFC). R-22 is an HCFC, while R-134a and R-410A are
examples of non-CFC refrigerants.
4. Which element in CFC molecules is primarily responsible for catalytic ozone destruction?
A. Hydrogen
B. Oxygen
C. Chlorine
D. Nitrogen
Correct Answer: C. Chlorine
Rationale: Ultraviolet radiation can break down CFC molecules in the stratosphere and release
chlorine atoms. The chlorine can participate repeatedly in reactions that destroy ozone. US
EPA
5. What does the term "recover" mean in refrigerant handling?
A. Processing refrigerant to remove contaminants
B. Returning refrigerant to a new-product specification
C. Removing refrigerant from an appliance and storing it in an external container
D. Burning refrigerant to destroy it
Correct Answer: C. Removing refrigerant from an appliance and storing it in an external
container
Rationale: Recovery means removing refrigerant from an appliance and storing it without
necessarily processing it. Recycling and reclaiming involve additional treatment or processing.
6. What is the main purpose of recycling refrigerant?
A. To permanently destroy it
B. To clean it for reuse by removing contaminants
C. To convert it into oxygen
D. To increase its pressure
Correct Answer: B. To clean it for reuse by removing contaminants
,Rationale: Recycling involves processing used refrigerant to reduce contaminants so that it
can potentially be reused. Reclamation is a more extensive process intended to return
refrigerant to specified purity standards.
7. Which term describes processing used refrigerant to meet a specified product purity
standard?
A. Recovery
B. Recycling
C. Reclamation
D. Evacuation
Correct Answer: C. Reclamation
Rationale: Reclamation involves processing refrigerant to a specified purity standard,
generally verified through appropriate analytical procedures. EPA's test topics distinguish
recovery, recycling, and reclamation. US EPA
8. What should a technician use to pressurize a system for leak testing when appropriate?
A. Oxygen
B. Compressed air
C. Nitrogen
D. Pure hydrogen
Correct Answer: C. Nitrogen
Rationale: Nitrogen is commonly used for pressure testing because it is dry and nonreactive
under normal service conditions. EPA specifically identifies nitrogen as an appropriate leak-
testing gas and warns against using oxygen or compressed air. US EPA
9. Why should oxygen not be used to pressurize a refrigeration system for leak testing?
A. Oxygen freezes easily
B. It can create a fire or explosion hazard when mixed with oil
C. Oxygen always damages copper
D. It lowers system pressure
Correct Answer: B. It can create a fire or explosion hazard when mixed with oil
, Rationale: Oxygen under pressure can react dangerously with lubricants and other materials.
Nitrogen should be used instead, with suitable pressure regulation and safety equipment. US
EPA
10. What device should normally be used to control nitrogen pressure during a pressure test?
A. Recovery cylinder
B. Pressure regulator
C. Sight glass
D. Filter-drier
Correct Answer: B. Pressure regulator
Rationale: A regulator allows the technician to control the pressure supplied from the
nitrogen cylinder. Appropriate safety controls are essential during pressure testing.
11. Why is evacuation performed after opening a refrigeration system?
A. To add oil automatically
B. To remove air and moisture
C. To increase refrigerant concentration
D. To raise condenser temperature
Correct Answer: B. To remove air and moisture
Rationale: Air and moisture are contaminants. Moisture can contribute to corrosion, freezing,
and acid formation, while noncondensable gases can adversely affect system performance.
EPA lists dehydration/evacuation as a core topic. US EPA
12. Which instrument is commonly used to measure vacuum during evacuation?
A. Micron gauge
B. Clamp meter
C. Tachometer
D. Psychrometer
Correct Answer: A. Micron gauge
Exam Questions & Answers, 100%
Guaranteed Pass ||Complete A+ Guide
1. What is the primary environmental concern associated with the release of CFC refrigerants?
A. Formation of acid rain
B. Depletion of stratospheric ozone
C. Increased groundwater salinity
D. Increased nitrogen fixation
Correct Answer: B. Depletion of stratospheric ozone
Rationale: CFCs can release chlorine in the stratosphere when exposed to ultraviolet
radiation. Chlorine participates in chemical reactions that destroy ozone molecules. Ozone
depletion is therefore a major environmental concern addressed by Section 608. US EPA
2. Which international agreement established a framework for phasing out ozone-depleting
substances?
A. Kyoto Protocol
B. Montreal Protocol
C. Paris Agreement
D. Geneva Convention
Correct Answer: B. Montreal Protocol
Rationale: The Montreal Protocol is the international agreement governing the phaseout of
substances that deplete the stratospheric ozone layer. EPA's Section 608 test topics specifically
include the Montreal Protocol. US EPA
3. Which of the following is a CFC?
A. R-12
B. R-22
C. R-134a
D. R-410A
Correct Answer: A. R-12
,Rationale: R-12 is a chlorofluorocarbon (CFC). R-22 is an HCFC, while R-134a and R-410A are
examples of non-CFC refrigerants.
4. Which element in CFC molecules is primarily responsible for catalytic ozone destruction?
A. Hydrogen
B. Oxygen
C. Chlorine
D. Nitrogen
Correct Answer: C. Chlorine
Rationale: Ultraviolet radiation can break down CFC molecules in the stratosphere and release
chlorine atoms. The chlorine can participate repeatedly in reactions that destroy ozone. US
EPA
5. What does the term "recover" mean in refrigerant handling?
A. Processing refrigerant to remove contaminants
B. Returning refrigerant to a new-product specification
C. Removing refrigerant from an appliance and storing it in an external container
D. Burning refrigerant to destroy it
Correct Answer: C. Removing refrigerant from an appliance and storing it in an external
container
Rationale: Recovery means removing refrigerant from an appliance and storing it without
necessarily processing it. Recycling and reclaiming involve additional treatment or processing.
6. What is the main purpose of recycling refrigerant?
A. To permanently destroy it
B. To clean it for reuse by removing contaminants
C. To convert it into oxygen
D. To increase its pressure
Correct Answer: B. To clean it for reuse by removing contaminants
,Rationale: Recycling involves processing used refrigerant to reduce contaminants so that it
can potentially be reused. Reclamation is a more extensive process intended to return
refrigerant to specified purity standards.
7. Which term describes processing used refrigerant to meet a specified product purity
standard?
A. Recovery
B. Recycling
C. Reclamation
D. Evacuation
Correct Answer: C. Reclamation
Rationale: Reclamation involves processing refrigerant to a specified purity standard,
generally verified through appropriate analytical procedures. EPA's test topics distinguish
recovery, recycling, and reclamation. US EPA
8. What should a technician use to pressurize a system for leak testing when appropriate?
A. Oxygen
B. Compressed air
C. Nitrogen
D. Pure hydrogen
Correct Answer: C. Nitrogen
Rationale: Nitrogen is commonly used for pressure testing because it is dry and nonreactive
under normal service conditions. EPA specifically identifies nitrogen as an appropriate leak-
testing gas and warns against using oxygen or compressed air. US EPA
9. Why should oxygen not be used to pressurize a refrigeration system for leak testing?
A. Oxygen freezes easily
B. It can create a fire or explosion hazard when mixed with oil
C. Oxygen always damages copper
D. It lowers system pressure
Correct Answer: B. It can create a fire or explosion hazard when mixed with oil
, Rationale: Oxygen under pressure can react dangerously with lubricants and other materials.
Nitrogen should be used instead, with suitable pressure regulation and safety equipment. US
EPA
10. What device should normally be used to control nitrogen pressure during a pressure test?
A. Recovery cylinder
B. Pressure regulator
C. Sight glass
D. Filter-drier
Correct Answer: B. Pressure regulator
Rationale: A regulator allows the technician to control the pressure supplied from the
nitrogen cylinder. Appropriate safety controls are essential during pressure testing.
11. Why is evacuation performed after opening a refrigeration system?
A. To add oil automatically
B. To remove air and moisture
C. To increase refrigerant concentration
D. To raise condenser temperature
Correct Answer: B. To remove air and moisture
Rationale: Air and moisture are contaminants. Moisture can contribute to corrosion, freezing,
and acid formation, while noncondensable gases can adversely affect system performance.
EPA lists dehydration/evacuation as a core topic. US EPA
12. Which instrument is commonly used to measure vacuum during evacuation?
A. Micron gauge
B. Clamp meter
C. Tachometer
D. Psychrometer
Correct Answer: A. Micron gauge
