EPA 608 CORE EXAM NEWEST 2026/2027 QUESTIONS and
CORRECT DETAILED ANSWERS ALREADY GRADED A+
When using nitrogen to pressurize a system, you should: - CORRECT ANSWER-
only charge with nitrogen vapor.
What effects can ozone depletion have on the environment? - CORRECT
ANSWER-reduced crop yields
reduced marine life
increased ground-level ozone
all of the above
Ozone depletion in the stratosphere is what type of problem? - CORRECT
ANSWER-Global
When transporting cylinders containing used refrigerant, the DOT requires that
you: - CORRECT ANSWER-attach DOT classification tags.
It is necessary to place a refrigerant label on: - CORRECT ANSWER-a refrigerant
cylinder which is being returned for reclaiming.
,An award of up to what amount may be paid to a person supplying information
that leads to a penalty against a technician who is intentionally venting? -
CORRECT ANSWER-$10,000
If an oil is hygroscopic it means that it: - CORRECT ANSWER-readily absorbs
moisture.
According to EPA regulations, which of the following is procedures is not an
approved technique for system cleanup after a burnout? - CORRECT ANSWER-
flushing with liquid refrigerant to clean tubing
Refrigerant can not be called "reclaimed" unless it: - CORRECT ANSWER-has
been chemically analyzed and the refrigerant meets the ARI-700 purity standard.
Which gas(es) would cause the LEAST damage to the environment during a leak
check? - CORRECT ANSWER-dry nitrogen
When a system will not hold a vacuum after it has been evacuated, then: -
CORRECT ANSWER-the system may be leaking.
,It is important not to mix different refrigerants in the same container because: -
CORRECT ANSWER-the mixture may be impossible to reclaim.
According to EPA regulations, which of the following is procedures is not an
approved technique for system cleanup after a burnout? - CORRECT ANSWER-
flushing with liquid refrigerant to clean tubing
When evacuating a system, the hoses should be: - CORRECT ANSWER-equal to
or larger than vacuum pump inlet connection.
When moisture exists in an operating system, which of the following is the most
likely to occur? - CORRECT ANSWER-Acid will form
A refillable refrigerant cylinder must never be filled to more than ________ of its
capacity by weight: - CORRECT ANSWER-80%
Of the refrigerants listed below, which has the lowest ozone depletion potential?
R-22
R-11
R-12
R-113 - CORRECT ANSWER-R-22
, In general, blended refrigerants should be charged: - CORRECT ANSWER-as a
liquid
Refrigerant migrates to the compressor crankcase because of a difference in
__________ between the refrigerant and the oil. - CORRECT ANSWER-vapor
pressure
When dehydrating a system, the system can be heated to: - CORRECT
ANSWER-decrease the dehydration time.
The evacuation of a system is a method of: - CORRECT ANSWER-dehydration.
It has been illegal to vent substitutes for CFC and HCFC refrigerants since: -
CORRECT ANSWER-November 1995.
Refrigerant entering the compressor of a refrigeration system is a: - CORRECT
ANSWER-superheated vapor
CORRECT DETAILED ANSWERS ALREADY GRADED A+
When using nitrogen to pressurize a system, you should: - CORRECT ANSWER-
only charge with nitrogen vapor.
What effects can ozone depletion have on the environment? - CORRECT
ANSWER-reduced crop yields
reduced marine life
increased ground-level ozone
all of the above
Ozone depletion in the stratosphere is what type of problem? - CORRECT
ANSWER-Global
When transporting cylinders containing used refrigerant, the DOT requires that
you: - CORRECT ANSWER-attach DOT classification tags.
It is necessary to place a refrigerant label on: - CORRECT ANSWER-a refrigerant
cylinder which is being returned for reclaiming.
,An award of up to what amount may be paid to a person supplying information
that leads to a penalty against a technician who is intentionally venting? -
CORRECT ANSWER-$10,000
If an oil is hygroscopic it means that it: - CORRECT ANSWER-readily absorbs
moisture.
According to EPA regulations, which of the following is procedures is not an
approved technique for system cleanup after a burnout? - CORRECT ANSWER-
flushing with liquid refrigerant to clean tubing
Refrigerant can not be called "reclaimed" unless it: - CORRECT ANSWER-has
been chemically analyzed and the refrigerant meets the ARI-700 purity standard.
Which gas(es) would cause the LEAST damage to the environment during a leak
check? - CORRECT ANSWER-dry nitrogen
When a system will not hold a vacuum after it has been evacuated, then: -
CORRECT ANSWER-the system may be leaking.
,It is important not to mix different refrigerants in the same container because: -
CORRECT ANSWER-the mixture may be impossible to reclaim.
According to EPA regulations, which of the following is procedures is not an
approved technique for system cleanup after a burnout? - CORRECT ANSWER-
flushing with liquid refrigerant to clean tubing
When evacuating a system, the hoses should be: - CORRECT ANSWER-equal to
or larger than vacuum pump inlet connection.
When moisture exists in an operating system, which of the following is the most
likely to occur? - CORRECT ANSWER-Acid will form
A refillable refrigerant cylinder must never be filled to more than ________ of its
capacity by weight: - CORRECT ANSWER-80%
Of the refrigerants listed below, which has the lowest ozone depletion potential?
R-22
R-11
R-12
R-113 - CORRECT ANSWER-R-22
, In general, blended refrigerants should be charged: - CORRECT ANSWER-as a
liquid
Refrigerant migrates to the compressor crankcase because of a difference in
__________ between the refrigerant and the oil. - CORRECT ANSWER-vapor
pressure
When dehydrating a system, the system can be heated to: - CORRECT
ANSWER-decrease the dehydration time.
The evacuation of a system is a method of: - CORRECT ANSWER-dehydration.
It has been illegal to vent substitutes for CFC and HCFC refrigerants since: -
CORRECT ANSWER-November 1995.
Refrigerant entering the compressor of a refrigeration system is a: - CORRECT
ANSWER-superheated vapor
