Core Flashcards
Which of the following refrigerants has the lowest global warming potential
R-600a
Which of the following gases is used as the baseline measurement for global warming potential
Carbon dioxide
Which type of refrigerant typically has the lowest global warming potential
HFOs
Why are HFO refrigerants less flammable hydrocarbon refrigerants
They contain fluorine
Which of the following refrigerants is an HFO
R-1234yf
Which of the following refrigerants have an ozone depletion potential of more than zero
R-134a and R-410a
Which of the following is an HFC refrigerant
R-134a
What is one of the most serious result of damage to the stratospheric ozone layer
Increased rates of skin cancer in humans
What is the strongest evidence that HCFCs are in the stratosphere
Measurement of chlorine and air samples from the lower atmosphere
Distributors must verify which of the following before they can sell HFC or HCFC refrigerant
The purchaser is or employees a section 608 certified technician
After the phase out of a refrigerant where will supplies of that refrigerant for equipment servicing come from
Recovery and reclaimed gas
Which one of the following is a lawful use of HCFC 22
Servicing existing R-22 Systems
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
Release of mixtures of nitrogen and refrigerant that result from adding nitrogen to a fully charged appliance to leak check the appliance
Which of the following is a low-pressure refrigerant under EPA’s refrigerant recycling regulations
R-123
The term retrofit refers to a change to the appliance in order to do what
Convert it to use a different refrigerant
Which of the following releases of a refrigerant is illegal
Venting refrigerant from a recovery machine or recovery cylinder
In what state does the refrigerant enter the metering or expansion device of a refrigeration system
Liquid
Which word applies to the process that returns refrigerant to new product specifications and that requires chemical analysis
Reclaim
Which of the following leak detection methods is considered to be the most effective for locating the general area of a small leak
Electronic or ultrasonic tester
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
When is a system considered dehydrated
The vacuum indicator shows you had reached and held a vacuum of 500 microns or less
Why should refrigerant vapor or missed in high concentrations not be inhaled
They may cause heart irregularities or unconsciousness
Why must containers designated refillable by DOT be used for transporting recovered pressurized refrigerant
To meet safety requirements
