EPA Section 608 - Core Exam |Questions with
100% Verified Answers
Ternary - ✔️✔️Three part blend of refrigerant
Ternary blends use what kind of synthetic lubricant? - ✔️✔️Alkylbenzene
Hygroscopic - ✔️✔️Oil with a high affinity for water. Most refrigerant oils and absorbs a lot of
moisture.
(T/F) An oil sample should be taken and analyzed if a system has had a major component failure
- ✔️✔️True
Components of a blended refrigerant will leak from a system at uneven rates due to different
____ - ✔️✔️Vapor pressures
(T/F) The proper method for charging blended refrigerants is to weigh into the low side of the
system as a liquid. - ✔️✔️False. High side
____ refers to a refrigerant blend that has a range of boiling points or condensing points
throughout the evaporator and condenser respectively - ✔️✔️Temperature glide
Azeotropic - ✔️✔️Refrigerant mixture that acts as a single component. No temperature glide
If you discover that two or more refrigerants have been mixed in a system, you must ____ -
✔️✔️Recover the mixture into a separate tank
Why is it important NOT to mix refrigerants in the same recovery system? - ✔️✔️It may become
impossible to reclaim
, If a strong odor is detected during recovery process... - ✔️✔️Compressor burnout likely occured
When recovering from a system that experienced a compressor burnout, watch for signs of
____ - ✔️✔️Oil contamination
(T/F) After recovering refrigerant, nitrogen used to flush debris out of the system may be legally
vented. - ✔️✔️True
What should be installed with a new compressor? - ✔️✔️Suction filter drier to trap any debris
EPA regulations require a service aperture or process stub on all appliances under ___ Or ___
refrigerant to make recovery easier - ✔️✔️Class 1 or Class 2
(T/F) The lower the ambient temperature, the faster the recovery rate. - ✔️✔️False
___ pressure hoses cause excessive pressure drop, increased recovery time, and potential for
increased emission - ✔️✔️Long
After completing the transfer of liquid between a recovery unit and a refrigeration system, you
should guard against trapping of liquid refrigerant where? - ✔️✔️Between the service valves
In order to determine the general area of a leak, use ____ - ✔️✔️Electronic or ultrasonic leak
detector
Once the general area of the leak has been located, use _____ to pinpoint the leak - ✔️✔️Soap
bubbles
Dehydration - ✔️✔️To remove water and water vapor from a refrigeration system
100% Verified Answers
Ternary - ✔️✔️Three part blend of refrigerant
Ternary blends use what kind of synthetic lubricant? - ✔️✔️Alkylbenzene
Hygroscopic - ✔️✔️Oil with a high affinity for water. Most refrigerant oils and absorbs a lot of
moisture.
(T/F) An oil sample should be taken and analyzed if a system has had a major component failure
- ✔️✔️True
Components of a blended refrigerant will leak from a system at uneven rates due to different
____ - ✔️✔️Vapor pressures
(T/F) The proper method for charging blended refrigerants is to weigh into the low side of the
system as a liquid. - ✔️✔️False. High side
____ refers to a refrigerant blend that has a range of boiling points or condensing points
throughout the evaporator and condenser respectively - ✔️✔️Temperature glide
Azeotropic - ✔️✔️Refrigerant mixture that acts as a single component. No temperature glide
If you discover that two or more refrigerants have been mixed in a system, you must ____ -
✔️✔️Recover the mixture into a separate tank
Why is it important NOT to mix refrigerants in the same recovery system? - ✔️✔️It may become
impossible to reclaim
, If a strong odor is detected during recovery process... - ✔️✔️Compressor burnout likely occured
When recovering from a system that experienced a compressor burnout, watch for signs of
____ - ✔️✔️Oil contamination
(T/F) After recovering refrigerant, nitrogen used to flush debris out of the system may be legally
vented. - ✔️✔️True
What should be installed with a new compressor? - ✔️✔️Suction filter drier to trap any debris
EPA regulations require a service aperture or process stub on all appliances under ___ Or ___
refrigerant to make recovery easier - ✔️✔️Class 1 or Class 2
(T/F) The lower the ambient temperature, the faster the recovery rate. - ✔️✔️False
___ pressure hoses cause excessive pressure drop, increased recovery time, and potential for
increased emission - ✔️✔️Long
After completing the transfer of liquid between a recovery unit and a refrigeration system, you
should guard against trapping of liquid refrigerant where? - ✔️✔️Between the service valves
In order to determine the general area of a leak, use ____ - ✔️✔️Electronic or ultrasonic leak
detector
Once the general area of the leak has been located, use _____ to pinpoint the leak - ✔️✔️Soap
bubbles
Dehydration - ✔️✔️To remove water and water vapor from a refrigeration system
