EPA 608 Exam: Practice Questions 1-100
With Answers.LATEST EXAM 2025/2026
When moisture exists in an operating system, what is most likely to
occur?-ANSWER-Acid will form.
What factor(s) affects the speed of evacuation?-ANSWER-1) The size of
the equipment being evacuated.
2)The ambient temperature.
3) The amount of moisture in the system
A system is considered dehydrated when?-ANSWER-The vacuum
indicator shows you have reached & held the required finished
vacuum.
The over-evacuation of a system:-ANSWER-Does not occur.
1|Page
,The size (capacity) of the vacuum pump & the size of the suction line
used will determine what?-ANSWER-The length of dehydration time.
A system is dehydrated to do what?-ANSWER-Remove water & water
vapor.
To obtain an accurate vacuum reading during system evacuation, the
system vacuum gauge should be located:-ANSWER-As far from the
vacuum pump as possible.
To scrap a disposable cylinder, the internal cylinder pressure should be
reduced to at least what?-ANSWER-0 psig
Never use an open flame to heat a refrigerant tank because?-ANSWER-
1) It can result in venting refrigerant to the atmosphere.
2)The tank may explode, causing serious injury to people nearby.
3) Refrigerant in the tank may decompose, forming a toxic material.
When operating refrigerant recovery or recycling equipment, the
following precautions should always be followed.-ANSWER-1) Wear
safety glasses.
2|Page
,2) Wear protective gloves.
3) Follow all safety precautions for the equipment.
The color code for approved refrigerant recovery cylinders is?-
ANSWER-Yellow tops & gray bodies.
Containers designed "refillable" by DOT are used for transporting
recovered pressurized refrigerant to?-ANSWER-To meet safety
requirements.
Refrigerant vapors or mist should not be inhaled because?-ANSWER-
They may cause heart irregularities &/or unconsciousness.
Never overfill refrigerant storage cylinders because?-ANSWER-The
internal pressure of the cylinders may rise in heated areas & cause an
explosion.
What is the best proof that CFC's are in the stratosphere?-ANSWER-The
measurement of CFC's in air samples from the stratosphere.
Which type of refrigerant is the most harmful to the stratospheric
ozone?-ANSWER-Refrigerants containing Bromine.
3|Page
, It is necessary to place a refrigerant label on what?-ANSWER-A
refrigerant cylinder which is being returned for reclaiming.
When transporting cylinders containing used refrigerant, the DOT
requires that you what?-ANSWER-Attach DOT classification tags.
Before you dispose of any system containing a refrigerant, you must?-
ANSWER-Recover the refrigerant.
In general, blended refrigerants should be charged?-ANSWER-As a
liquid.
Refrigerant entering the compressor of a refrigeration system is a?-
ANSWER-Superheated vapor.
__________ refers to the process of cleaning refrigerants by oil
separation & single or multiple passes through filter-driers, which
reduce moisture & acidity?-ANSWER-Recycling
When a system will not hold a vacuum after it has been evacuated,
then?-ANSWER-The system may be leaking.
Which gas(es) would cause the LEAST damage to the environment
during a leak check?-ANSWER-Dry Nitrogen
4|Page
With Answers.LATEST EXAM 2025/2026
When moisture exists in an operating system, what is most likely to
occur?-ANSWER-Acid will form.
What factor(s) affects the speed of evacuation?-ANSWER-1) The size of
the equipment being evacuated.
2)The ambient temperature.
3) The amount of moisture in the system
A system is considered dehydrated when?-ANSWER-The vacuum
indicator shows you have reached & held the required finished
vacuum.
The over-evacuation of a system:-ANSWER-Does not occur.
1|Page
,The size (capacity) of the vacuum pump & the size of the suction line
used will determine what?-ANSWER-The length of dehydration time.
A system is dehydrated to do what?-ANSWER-Remove water & water
vapor.
To obtain an accurate vacuum reading during system evacuation, the
system vacuum gauge should be located:-ANSWER-As far from the
vacuum pump as possible.
To scrap a disposable cylinder, the internal cylinder pressure should be
reduced to at least what?-ANSWER-0 psig
Never use an open flame to heat a refrigerant tank because?-ANSWER-
1) It can result in venting refrigerant to the atmosphere.
2)The tank may explode, causing serious injury to people nearby.
3) Refrigerant in the tank may decompose, forming a toxic material.
When operating refrigerant recovery or recycling equipment, the
following precautions should always be followed.-ANSWER-1) Wear
safety glasses.
2|Page
,2) Wear protective gloves.
3) Follow all safety precautions for the equipment.
The color code for approved refrigerant recovery cylinders is?-
ANSWER-Yellow tops & gray bodies.
Containers designed "refillable" by DOT are used for transporting
recovered pressurized refrigerant to?-ANSWER-To meet safety
requirements.
Refrigerant vapors or mist should not be inhaled because?-ANSWER-
They may cause heart irregularities &/or unconsciousness.
Never overfill refrigerant storage cylinders because?-ANSWER-The
internal pressure of the cylinders may rise in heated areas & cause an
explosion.
What is the best proof that CFC's are in the stratosphere?-ANSWER-The
measurement of CFC's in air samples from the stratosphere.
Which type of refrigerant is the most harmful to the stratospheric
ozone?-ANSWER-Refrigerants containing Bromine.
3|Page
, It is necessary to place a refrigerant label on what?-ANSWER-A
refrigerant cylinder which is being returned for reclaiming.
When transporting cylinders containing used refrigerant, the DOT
requires that you what?-ANSWER-Attach DOT classification tags.
Before you dispose of any system containing a refrigerant, you must?-
ANSWER-Recover the refrigerant.
In general, blended refrigerants should be charged?-ANSWER-As a
liquid.
Refrigerant entering the compressor of a refrigeration system is a?-
ANSWER-Superheated vapor.
__________ refers to the process of cleaning refrigerants by oil
separation & single or multiple passes through filter-driers, which
reduce moisture & acidity?-ANSWER-Recycling
When a system will not hold a vacuum after it has been evacuated,
then?-ANSWER-The system may be leaking.
Which gas(es) would cause the LEAST damage to the environment
during a leak check?-ANSWER-Dry Nitrogen
4|Page
