EPA 608 UNIVERSAL EXAM ACTUAL EXAM ALL 160
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
RATIONALES (VERIFIED ANSWERS
Question 1
Which of the following refrigerants has the highest Ozone Depletion Potential
(ODP)?
A) R-134a
B) R-410A
C) R-22
D) R-11
E) R-600a
Correct Answer: D) R-11
Rationale: Chlorofluorocarbons (CFCs) such as R-11 and R-12 have the
highest ODP due to their chlorine content and stability in the
atmosphere, making them significant ozone-depleting substances.
Question 2
What is the primary environmental concern associated with the release of
CFC and HCFC refrigerants into the atmosphere?
A) Global warming
B) Acid rain
C) Ozone depletion
D) Smog formation
E) Water pollution
Correct Answer: C) Ozone depletion
Rationale: CFC and HCFC refrigerants contain chlorine, which, when
released into the stratosphere, catalyzes the destruction of the
Earth's protective ozone layer, leading to increased UV radiation.
Question 3
Which international treaty first identified CFCs and HCFCs as ozone-depleting
substances and called for their phase-out?
A) Kyoto Protocol
B) Paris Agreement
C) Montreal Protocol
D) Geneva Convention
E) Stockholm Convention
Correct Answer: C) Montreal Protocol
Rationale: The Montreal Protocol on Substances that Deplete the
Ozone Layer, signed in 1987, is an international treaty designed to
protect the ozone layer by phasing out the production of numerous
substances responsible for ozone depletion.
,Question 4
Under EPA Section 608, what certification is required for technicians who
maintain, service, repair, or dispose of high-pressure appliances (e.g.,
residential A/C, commercial refrigeration)?
A) Type I
B) Type II
C) Type III
D) Universal
E) Type IV
Correct Answer: B) Type II
Rationale: Type II certification covers refrigerants used in high-
pressure appliances, typically those containing more than 5 pounds
of refrigerant, such as most residential and commercial air
conditioning and refrigeration systems.
Question 5
Before beginning a refrigerant recovery procedure, what is the first step a
certified technician should take?
A) Start the recovery unit.
B) Connect the recovery machine to the system.
C) Check the recovery machine's oil level.
D) Wear appropriate personal protective equipment (PPE).
E) Open all valves on the recovery machine.
Correct Answer: D) Wear appropriate personal protective equipment
(PPE).
Rationale: Safety is always the first priority. Wearing PPE such as
safety glasses or goggles, gloves, and appropriate clothing protects
the technician from contact with refrigerants, which can cause
frostbite or chemical burns.
Question 6
Which of the following is considered a "low-pressure appliance"?
A) R-22 air conditioner
B) R-134a chiller
C) R-11 chiller
D) R-410A refrigeration unit
E) R-600a domestic refrigerator
Correct Answer: C) R-11 chiller
Rationale: Low-pressure appliances typically operate with
refrigerants that have a boiling point above ambient temperature,
,such as R-11 and R-123, which commonly use a purge unit to
remove non-condensables.
Question 7
What is the maximum allowed leak rate for comfort cooling appliances with a
charge of 50 pounds or more of refrigerant?
A) 5%
B) 10%
C) 15%
D) 20%
E) 35%
Correct Answer: B) 10%
Rationale: For comfort cooling appliances with a charge of 50 pounds
or more, the maximum allowed annual leak rate is 10%. This rate
dictates when a system must be repaired if it exceeds the threshold.
Question 8
Why are disposable refrigerant cylinders not to be refilled?
A) They are not designed for the higher pressures of repeated use.
B) They are too heavy to transport when full.
C) Refilling causes chemical degradation of the refrigerant.
D) They are made of materials that react with new refrigerants.
E) They are designed for a single use and lack features like pressure relief
valves for safe refilling.
Correct Answer: E) They are designed for a single use and lack
features like pressure relief valves for safe refilling.
Rationale: Disposable cylinders are not built to withstand the
stresses of repeated pressurization and evacuation, nor do they
typically have the necessary pressure relief devices or sturdy
construction required for safe refilling. Refilling them is illegal and
extremely dangerous.
Question 9
Under EPA regulations, a "small appliance" is defined as a pre-charged
appliance that contains how much refrigerant?
A) 2 pounds or less
B) 3 pounds or less
C) 5 pounds or less
D) 10 pounds or less
E) 15 pounds or less
Correct Answer: C) 5 pounds or less
, Rationale: Small appliances are hermetically sealed systems with 5
pounds or less of refrigerant that are entirely fabricated, charged,
and sealed in a factory.
Question 10
Which of the following is an acceptable method for detecting a large
refrigerant leak?
A) Electronic leak detector
B) Halide torch
C) Soapy water solution
D) UV dye
E) All of the above
Correct Answer: C) Soapy water solution
Rationale: For large leaks, a simple soapy water solution can be very
effective as it will bubble at the point of leakage. While electronic
detectors and UV dye are also used for leak detection, soapy water
is a practical first step for larger leaks.
Question 11
What is the state of refrigerant when it enters the compressor from the
evaporator?
A) High-pressure, high-temperature liquid
B) Low-pressure, low-temperature liquid
C) High-pressure, low-temperature vapor
D) Low-pressure, low-temperature vapor
E) High-pressure, high-temperature vapor
Correct Answer: D) Low-pressure, low-temperature vapor
Rationale: The evaporator absorbs heat, causing the liquid
refrigerant to boil and turn into a low-pressure, low-temperature
vapor before entering the compressor.
Question 12
When evacuating a refrigeration system, why is it important to pull a deep
vacuum?
A) To remove all refrigerant from the system.
B) To remove non-condensables and moisture from the system.
C) To increase the system's capacity.
D) To lubricate the compressor.
E) To prevent refrigerant from boiling at low temperatures.
Correct Answer: B) To remove non-condensables and moisture from
the system.
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
RATIONALES (VERIFIED ANSWERS
Question 1
Which of the following refrigerants has the highest Ozone Depletion Potential
(ODP)?
A) R-134a
B) R-410A
C) R-22
D) R-11
E) R-600a
Correct Answer: D) R-11
Rationale: Chlorofluorocarbons (CFCs) such as R-11 and R-12 have the
highest ODP due to their chlorine content and stability in the
atmosphere, making them significant ozone-depleting substances.
Question 2
What is the primary environmental concern associated with the release of
CFC and HCFC refrigerants into the atmosphere?
A) Global warming
B) Acid rain
C) Ozone depletion
D) Smog formation
E) Water pollution
Correct Answer: C) Ozone depletion
Rationale: CFC and HCFC refrigerants contain chlorine, which, when
released into the stratosphere, catalyzes the destruction of the
Earth's protective ozone layer, leading to increased UV radiation.
Question 3
Which international treaty first identified CFCs and HCFCs as ozone-depleting
substances and called for their phase-out?
A) Kyoto Protocol
B) Paris Agreement
C) Montreal Protocol
D) Geneva Convention
E) Stockholm Convention
Correct Answer: C) Montreal Protocol
Rationale: The Montreal Protocol on Substances that Deplete the
Ozone Layer, signed in 1987, is an international treaty designed to
protect the ozone layer by phasing out the production of numerous
substances responsible for ozone depletion.
,Question 4
Under EPA Section 608, what certification is required for technicians who
maintain, service, repair, or dispose of high-pressure appliances (e.g.,
residential A/C, commercial refrigeration)?
A) Type I
B) Type II
C) Type III
D) Universal
E) Type IV
Correct Answer: B) Type II
Rationale: Type II certification covers refrigerants used in high-
pressure appliances, typically those containing more than 5 pounds
of refrigerant, such as most residential and commercial air
conditioning and refrigeration systems.
Question 5
Before beginning a refrigerant recovery procedure, what is the first step a
certified technician should take?
A) Start the recovery unit.
B) Connect the recovery machine to the system.
C) Check the recovery machine's oil level.
D) Wear appropriate personal protective equipment (PPE).
E) Open all valves on the recovery machine.
Correct Answer: D) Wear appropriate personal protective equipment
(PPE).
Rationale: Safety is always the first priority. Wearing PPE such as
safety glasses or goggles, gloves, and appropriate clothing protects
the technician from contact with refrigerants, which can cause
frostbite or chemical burns.
Question 6
Which of the following is considered a "low-pressure appliance"?
A) R-22 air conditioner
B) R-134a chiller
C) R-11 chiller
D) R-410A refrigeration unit
E) R-600a domestic refrigerator
Correct Answer: C) R-11 chiller
Rationale: Low-pressure appliances typically operate with
refrigerants that have a boiling point above ambient temperature,
,such as R-11 and R-123, which commonly use a purge unit to
remove non-condensables.
Question 7
What is the maximum allowed leak rate for comfort cooling appliances with a
charge of 50 pounds or more of refrigerant?
A) 5%
B) 10%
C) 15%
D) 20%
E) 35%
Correct Answer: B) 10%
Rationale: For comfort cooling appliances with a charge of 50 pounds
or more, the maximum allowed annual leak rate is 10%. This rate
dictates when a system must be repaired if it exceeds the threshold.
Question 8
Why are disposable refrigerant cylinders not to be refilled?
A) They are not designed for the higher pressures of repeated use.
B) They are too heavy to transport when full.
C) Refilling causes chemical degradation of the refrigerant.
D) They are made of materials that react with new refrigerants.
E) They are designed for a single use and lack features like pressure relief
valves for safe refilling.
Correct Answer: E) They are designed for a single use and lack
features like pressure relief valves for safe refilling.
Rationale: Disposable cylinders are not built to withstand the
stresses of repeated pressurization and evacuation, nor do they
typically have the necessary pressure relief devices or sturdy
construction required for safe refilling. Refilling them is illegal and
extremely dangerous.
Question 9
Under EPA regulations, a "small appliance" is defined as a pre-charged
appliance that contains how much refrigerant?
A) 2 pounds or less
B) 3 pounds or less
C) 5 pounds or less
D) 10 pounds or less
E) 15 pounds or less
Correct Answer: C) 5 pounds or less
, Rationale: Small appliances are hermetically sealed systems with 5
pounds or less of refrigerant that are entirely fabricated, charged,
and sealed in a factory.
Question 10
Which of the following is an acceptable method for detecting a large
refrigerant leak?
A) Electronic leak detector
B) Halide torch
C) Soapy water solution
D) UV dye
E) All of the above
Correct Answer: C) Soapy water solution
Rationale: For large leaks, a simple soapy water solution can be very
effective as it will bubble at the point of leakage. While electronic
detectors and UV dye are also used for leak detection, soapy water
is a practical first step for larger leaks.
Question 11
What is the state of refrigerant when it enters the compressor from the
evaporator?
A) High-pressure, high-temperature liquid
B) Low-pressure, low-temperature liquid
C) High-pressure, low-temperature vapor
D) Low-pressure, low-temperature vapor
E) High-pressure, high-temperature vapor
Correct Answer: D) Low-pressure, low-temperature vapor
Rationale: The evaporator absorbs heat, causing the liquid
refrigerant to boil and turn into a low-pressure, low-temperature
vapor before entering the compressor.
Question 12
When evacuating a refrigeration system, why is it important to pull a deep
vacuum?
A) To remove all refrigerant from the system.
B) To remove non-condensables and moisture from the system.
C) To increase the system's capacity.
D) To lubricate the compressor.
E) To prevent refrigerant from boiling at low temperatures.
Correct Answer: B) To remove non-condensables and moisture from
the system.
