HVAC Test Questions and Correct Answers
Which of the following refrigerants contains chlorine?
✓ ~~~ R-22
What is being done in the U.S, to stop damage to the stratospheric ozone layer?
✓ ~~~ Phasing out the use of chlorofluorocarbons (CFCs) and
hydrochlorofluorocarbons (HCFCs).
Which of the following is NOT a violation of the refrigerant management regulations
under the Clean Air Act?
✓ ~~~ Failing to evacuate refrigerant in a leaking system to at least 0 psig.
Which refrigerant can be purchased by someone who is NOT a Section 608
certified technician?
✓ ~~~ Carbon Dioxide refrigerant.
Which of the following appliances is NOT covered by EPA Section 608 regulations?
✓ ~~~ Desiccant dehumidifiers
When do EPA's refrigerant management regulations exempt refrigerant from the
venting prohibition?
✓ ~~~ When the EPA has determined that the refrigerant in that type of appliance
does not pose a threat to the environment if released.
,Which of the following refrigerant releases is considered a violation of the prohibition
on venting?
✓ ~~~ Refrigerants emitted when connecting or disconnecting low loss hoses to
charge or service an appliance.
What synthetic lubricant is presently used with ternary blends containing HCFCs?
✓ ~~~ Ester.
Which of the following is NOT a "refrigerant" as it is used in EPA's refrigerant
management regulations?
✓ ~~~ A leak trace gas.
Which component changes a low-pressure vapor to a high-pressure vapor?
✓ ~~~ Compressor.
Manufacturers often color code the exterior of gauges. What color is the high-
pressure gauge on a typical gauge manifold set?
✓ ~~~ Red
Which word applies to the process that returns refrigerant to new product
specifications and that requires chemical analysis?
✓ ~~~ Reclaim
, What gas should be used to leak check a system designed for use with R-410A that
has been opened for a major system repair?
✓ ~~~ Pressurized nitrogen
What should a technician do if they discover that some R-410A was added to an R-
22 system?
✓ ~~~ Recover the mixture in a separate recovery tank.
Why should a system be evacuated?
✓ ~~~ To dehydrate the system.
What are the two factors that, if present, are most likely to lead to an explosion with
hydrocarbon refrigerants?
✓ ~~~ A sufficient concentration of the refrigerant in the space and an ignition source.
How frequently must reusable containers for refrigerants that are under high
pressure (above 15 psig) at normal ambient temperature be hydrostatically tested?
✓ ~~~ 5 years.
The Department of Transportation regulations require which parameter to be
recorded on the shipping paper for hazard class 2.2 Nonflammable Compressed
Gases?
✓ ~~~
Which of the following refrigerants contains chlorine?
✓ ~~~ R-22
What is being done in the U.S, to stop damage to the stratospheric ozone layer?
✓ ~~~ Phasing out the use of chlorofluorocarbons (CFCs) and
hydrochlorofluorocarbons (HCFCs).
Which of the following is NOT a violation of the refrigerant management regulations
under the Clean Air Act?
✓ ~~~ Failing to evacuate refrigerant in a leaking system to at least 0 psig.
Which refrigerant can be purchased by someone who is NOT a Section 608
certified technician?
✓ ~~~ Carbon Dioxide refrigerant.
Which of the following appliances is NOT covered by EPA Section 608 regulations?
✓ ~~~ Desiccant dehumidifiers
When do EPA's refrigerant management regulations exempt refrigerant from the
venting prohibition?
✓ ~~~ When the EPA has determined that the refrigerant in that type of appliance
does not pose a threat to the environment if released.
,Which of the following refrigerant releases is considered a violation of the prohibition
on venting?
✓ ~~~ Refrigerants emitted when connecting or disconnecting low loss hoses to
charge or service an appliance.
What synthetic lubricant is presently used with ternary blends containing HCFCs?
✓ ~~~ Ester.
Which of the following is NOT a "refrigerant" as it is used in EPA's refrigerant
management regulations?
✓ ~~~ A leak trace gas.
Which component changes a low-pressure vapor to a high-pressure vapor?
✓ ~~~ Compressor.
Manufacturers often color code the exterior of gauges. What color is the high-
pressure gauge on a typical gauge manifold set?
✓ ~~~ Red
Which word applies to the process that returns refrigerant to new product
specifications and that requires chemical analysis?
✓ ~~~ Reclaim
, What gas should be used to leak check a system designed for use with R-410A that
has been opened for a major system repair?
✓ ~~~ Pressurized nitrogen
What should a technician do if they discover that some R-410A was added to an R-
22 system?
✓ ~~~ Recover the mixture in a separate recovery tank.
Why should a system be evacuated?
✓ ~~~ To dehydrate the system.
What are the two factors that, if present, are most likely to lead to an explosion with
hydrocarbon refrigerants?
✓ ~~~ A sufficient concentration of the refrigerant in the space and an ignition source.
How frequently must reusable containers for refrigerants that are under high
pressure (above 15 psig) at normal ambient temperature be hydrostatically tested?
✓ ~~~ 5 years.
The Department of Transportation regulations require which parameter to be
recorded on the shipping paper for hazard class 2.2 Nonflammable Compressed
Gases?
✓ ~~~
