EPA 608 Certification Practice Test
Inhaling refrigerant vapors or mist is not recommended because
they may cause heart irregularities and/or unconsciousness.
Refrigerant vapors or mist should not be inhaled because they may cause heart irregularities and/or unconsciousness.
The ozone depletion potential (ODP) of Class II refrigerants is less than _____ :
0.2
HCFCs comes under Class II refrigerants with ODP less than 0.2
The refrigerant recovery cylinder should not be filled to more than _____% of its capacity.
80 percent
If it is filled beyond 80% during increase in temperature the refrigerant expands results in increase in pressure inside the cylinder which can lead to bursting of cylinder
After 1995, the only source of CFC refrigerants for current refrigeration appliances in the United States was from .
recovery and recycling.
After 1995 supplies of CFC refrigerants used to service existing refrigeration appliances in the United States can only from recovery and recycling.
The most frequent type of oil used in stationary refrigeration systems using HFC-134a refrigerant is
ester oil.
The tupe of oil that is most commonly used in stationary refrigeration application with HFC-134a refrigerant is ester oil.
Which of the following refrigerants is only used in disposable cylinders:
Virgin refrigerant
Disposable cylinders are used for virgin refrigerant & reclaimed refrigerants only.
True or False? Before scrapping, the final individual in the disposal chain must check.
All the refrigerant has been removed from the appliances.
True
Anyone in the disposal chain can remove the refrigerant, however last person in the disposal chain (scrap metal or landfill operator) must ensure that all the refrigeration is removed and proper records are maintained.
Never pressurize a system with compressed air or oxygen because
when mixed with compressor oil or some refrigerants, it could explode.
Never use oxygen or compressed air to pressurize a system because when mixed with compressor oil or some refrigerants, it could explode.
True or False, All Refrigerant Oils are Hydroscopic:
True
All synthetic oils are hydroscopic (readily absorbs moisture) but not mineral oils.
Mixed refrigerants are received in a tank at a reclamation facility. What options do they have?
All of the Above
Refrigerants should not be mixed in a recovery tank. A reclamation facility can execute any of the options listed above.
In a refrigerant system, the ____connects the evaporator to the compressor:
Suction Line
The suction line connects the evaporator to the compressor in a refrigerant system.
Which of the following gases is used to pressurize (for leak checking) or blow debris out of a sealed system after recovering refrigerant:
Nitrogen gas
Nitrogen is colorless, odourless, non inflammable and readily available (economical) gas. It may not cause any acidic formation when reacts with oxygen or moisture which can result in corrosion. CO2 in presence of moisture forms carbonic acid
Which of the following refrigerants is chlorine-free?
HFC
HFCs do not contain Chlorine they do have a very high Global Warming Potential, or GWP. GWP is a measurement that is used to measure the impact a Greenhouse Gas has on the climate and environment.
Which of the following has the greatest potential for Ozone Depletion (ODP):
CFC
CFCs has highest Ozone Depletion Potential because of the presence of chlorine element which reacts with ozone at stratosphere
The person responsible for ensuring that the refrigerant has been removed from household refrigerators before they are disposed of is the person accountable under the EPA's "safe disposal requirement."
final person in the disposal chain.
Under the SPAs "safe disposal requirement", the person responsible for making sure that the refrigerant has been removed from household refrigerators before they are disposed of is the final person in the disposal chain.
Which HC refrigerant can be used in new small domestic appliances?
R-600a
Hydrocarbon (HC) R-600a is an approved refrigerant for new household refrigerators, freezers, and combination refrigeration/freezers. (Page 16 ESCO EPA 9TH V2 Edition Prep Manual)