EPA 608 CORE
______ refrigerants leak at uneven rates due to the differences in the vapor pressures.
Blended
_____ in refrigerants causes ozone destruction.
Chlorine
Which refrigerant is a chlorine free refrigerant?
HFC R 134A
Which of the refrigerants listed below contain no chlorine? A) CFCs B)HCFCs C) HFCs D) ODCs
HFCs
What is the result damage to the ozone layer?
Increases in human skin cancer
Since July 1, 1992 it has been illegal to:
Knowingly releasing HCF or HCFC refrigerants in the U.S.
________is a CFC. A) R-141b B) R- 134a C) R-502 D) R-123
R-502
_________ CFCs can no longer be legally manufactured or imported into the United States. Supplies of CFC refrigerant for equipment servicing can ONLY come from recovery, recycling, and reclamation.
Since December 31, 1995,
It is necessary to place a refrigerant label on:
a refrigerant cylinder which is being returned for reclaiming.
Each chlorine atom in the stratosphere can destroy how many ozone molecules?
100,000 ozone molecules
The Clean Air Act calls for the phase-out of CFC/HCFC production, prohibits CFC/HCFC venting, and requires the EPA to set standards for recovery, recycling, and reclamation of refrigerants.
July 1, 1992
Positive evidence that CFCs are in the stratosphere comes from ____________?
Measurements of CFCs in air samples taken from the stratosphere
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?
$10,000
One chlorine atom in the stratosphere is capable of destroying how many ozone molecules?
100,000
CFC's will no longer be manufactured or imported into the U.S. after what year?
1995
Manufacture of CFCs was banned as of December 31, _______? A) 1994 B) 1995 C) 2000 D) 2010
1995
A fillable refrigerant cylinder must never be filled to more than ______ of its capacity by weight:
80%
A refillable refrigerant cylinder must never be filled to more than ________ of its capacity by weight:
80%
Which compound are the most damaging to the stratospheric ozone layer and have the highest ozone depletion potential rating?
CFCs
Chlorofuorocarbons, or CFCs, consist ofwhich of the following chemicals?
Chlorine, fluorine and carbon
During dehydration of a refrigeration system the refrigeration system is heated to:
Decrease dehydration time
When evacuating a system, the hoses should be:
Equal to or larger than vacuum pump inlet connection
Recovery equipment manufactured after ___________ that is used during maintenance, service, or repair must be certified by an EPA-approved laboratory.
November 15, 1993
It has been illegal to vent substitutes for CFC and HCFC refrigerants since:
November 1995.
Which refrigerant is an HFC? A) R-123 B) R- 134a C) R- 11 D) R- 22
R-134a
An example of an HCFC refrigerant:
R-22
Of the refrigerants listed below, which has the lowest ozone depletion potential? R-22 R-11 R-12 R-113
R-22
CF Cs are more likely to reach the stratosphere than other chlorine-containing compounds because___________.
They are chemically very stable
Containers designated "refillable" by DOT are used for transporting recovered pressurized refrigerant ________?
To meet safety requirements
The definition of recover is:
To remove refrigerant in any condition from a system and store it an external container without neccesarily testing it
When transporting cylinders containing used refrigerants DOT REQUIRES that you:
attach DOT classification tags
When transporting cylinders containing used refrigerant, the DOT requires that you:
attach DOT classification tags.
Which gas(es) would cause the LEAST damage to the environment during a leak check?
dry nitrogen
When evacuating a system, the hoses should be:
equal to or larger than vacuum pump inlet connection.
According to EPA regulations, which of the following is procedures is not an approved technique for system cleanup after a burnout?
flushing with liquid refrigerant to clean tubing
Refrigerant can not be called "reclaimed" unless it:
has been chemically analyzed and the refrigerant meets the ARI-700 purity standard.
After refrigerant liquid transfer between recovery unit and the system being emptied, you need to avoid trapping:
liquid refrigerant between service valves.
HFC fluorocarbon refrigerants cause
no harm to stratospheric ozone; they have a zero ODP. They do however contribute to global warming (like any refrigerant) and cannot be vented.
When using nitrogen to pressurize a system, you should:
only charge with nitrogen vapor.
CFCs have the highest:
ozone depletion potential (ODP) and are the most harmful to stratospheric ozone.
Actual measurements of CFCs in air samples from the stratosphere are
positive evidence that CFCs are in the stratosphere.
If an oil is hygroscopic it means that it:
readily absorbs moisture.
_____________ refers to the process of cleaning refrigerant by oil separation and single or multiple passes through filter-driers, which reduce moisture and acidity?
recycling
If corrosion is found within the body of a relief valve, the valve must be:
replaced.
Refrigerant entering the compressor of a refrigeration system is a:
superheated vapor
The existence of chlorine monoxide in the upper stratosphere indicates:
that the ozone layer is being destroyed.
Refrigerant migrates to the compressor crankcase because of a difference in __________ between the refrigerant and the oil.
vapor pressure
What effects can ozone depletion have on the environment?
reduced crop yields reduced marine life increased ground-level ozone all of the above
It is important not to mix different refrigerants in the same container because:
the mixture may be impossible to reclaim.
When a system will not hold a vacuum after it has been evacuated, then:
the system may be leaking.
Chlorofluorocarbon (CFC) refrigerants are so named because:
they contain the elements Chlorine, Fluorine, and Carbon.
The system vacuum gauge should be connected __________?
As far as possible from the vacuum pump.
To obtain an accurate vacuum reading during system evacuation, the system vacuum gauge should be located:
As far from the vacuum pump as possible
Discarding of disposable cylinders is accomplished by
Assuring that all refrigerant is recovered and that the cylinders are rendered useless then recycle the metal
What characteristic or characteristics of CFCs make them more likely than other chlorine compounds to reach the stratosphere?
Dont disolve iin water
All devices used for refrigerant recovery must meet___________standards.
EPA
________ test methods are assumed by the EPA as the most effective methods for locating the general area of small leaks.
Electronic and ultrasonic
Which of the following leak detection methods is considered by the EPA to be the effective for locating the general area of small leaks?
Electronic ultrasonic testers
A cylinder with grey body and a yellow top indicates that the cylinder is designated to hold:
Recovered refrigerant
Cooling occurs in a vapor compression refrigeration system when:
Refrigerant liquid boils into a vapor
A system is dehydrated to:
Remove water and water vapor
Recovery devices that can capture liquid and/ or vapor refrigerant without the assistance of components in the air conditioning or refrigerant equipment are known as _____.
Self-contained
___________ technicians servicing refrigeration hardware must be certified in refrigerant recovery and the sale of refrigerants has been restricted to technicians certified in refrigerant recovery.
Since November 14, 1994,
__________ refrigerant recovery devices must be equipped with low-loss fittings, which are fittings that are used to connect the recovery device to an appliance and which can be either manually closed or which closes automatically when disconnected to prevent loss of refrigerant from hoses.
Since November 15, 1993
____________ it has been illegal to vent any refrigerant including substitutes for CFC, HCFC, and HFC refrigerants. This is because the EPA has determined that all refrigerants contribute to global warming.
Since November 15, 1995,
Recovery during low ambient temperatures will:
Slow the recovery process
________recovery devices are so named because they depend on components of the system. That is, they capture refrigerant with the assistance of components in the air conditioning or refrigeration equipment they are emptying
System-dependent
Care should be used to avoid over filling refrigerant storage cylinders because:
The internal pressure of the cylinders may rise and cause an explosion
The size (capacity) of the vacuum pump and the size of the suction line used will determine:
The length of dehydration time
What is the significance of an azeotropic mixture?
The mixture combines to act like a single component refrigerant
What is the significance of atheotropic mixture:
The mixture combines to act as a single compound refrigerant
When dehydrating a system, the system can be heated to:
decrease the dehydration time.
Under EPAs regulations reclaimed refrigerant must meet standards for purity before it can be resold
ARI 700
When moisture exist in an operating system, which of the following is the most likely to occur?
Acid will form
When moisture exists in an operating system, which of the following is the most likely to occur?
Acid will form
If a reclamation company is shipping a cylinder containing mixed refrigerants they may ______.
Agree to destroy the refrigerant but typically a substantial fee is charged
The syntetic substitute currently usedwith blends containing HCFCs is:
Alcobenzine
EPA regulations cover all AC and refrigeration equipment when containing what?
Any refrigerant or refrigerant substitute
How much money can be awarded to a person who supplies information leading to a conviction against the technician who is intentionally venting refrigerants or violatingsome other provision of the EPA CLEAN AIR ACT
$10,000
According to the EPA, chlorine in the stratosphere is believed to come primarily from the CFCs rather than from volcanoes because
-) The rise in the amount of chlorine measured in the stratosphere over the past 2 decades matches the rise of chlorine which has different natural sources of chlorune overthe same period -) The rise of chlorine in the statosphere matches the rise in CFCs over the same period -) samples of air taken over erupting volcanoes shows that volcanoes contribute a small amount of chlorine in the stratosphere compared to CFCs -) ALL OF THE ABOVE
Which compounds are controlled by the Montreal protocol?
-) chloric floric carbons -) hydro chloric carbons -) halons -) all of the above
Which is a violation of the EPA clean air act?
-) falsifying or failing to keep required records -) failing to keep evacuation levels before opening or disposing of appliances -) knowingly releasing HFC's, HCFCs or CFC refrigerants -) ALL OF THE ABOVE
What factors affects the speed of evacuation?
-) the size of the equipment being evacuated -) the ambient temperature -) the amount of moisture in the system
Ozone depletion in the stratosphere is what type of problem?
Global
Hydrochlorofluorocarbon (HCFC) refrigerants contain:
Hydrogen, Chlorine, Fluorine, and Carbon
Hydrofluorocarbon (HFC) refrigerants contain:
Hydrogen, Fluorine, and Carbon. R-134a, also known as HFC-134a, a chlorine-free refrigerant.
HYDROCHLORIC FLORICCARBON (HCFC) refrigerant contain?
Hydrogen, chlorine, flourine and carbon
Ozone depletion in the stratosphere is what type of problem:
Its a GLOBAL problem
Mandatory use of certified recycling equipment when servicing automotive (not commercial/residential/industrial) air conditioning.
January 1, 1992
All persons opening appliances (except for small appliances and motor vehicle A/C) for maintenance, service, or repair, and all persons disposing of appliances, except for small appliances, must have at least one piece of certified, self-contained recovery equipment available at their place of business.
July 13, 1993
HCFC refrigerants cause ____________ damage to the stratospheric ozone layer in comparison to CFC refrigerants.
Less
To determine the safe pressure for leak testing one should use:
Low side test data plate value
Refrigerant vapors or mist should not be inhaled because:
They may cause heart irregularities and or unconsciousness
Which refrigerant contains a CFC? R500, R12, R113 or R11?
Theyre all CFC's
Ozone in the stratosphere consist of molecules containing _________ oxygen atoms.
Three
Technicians are certified to recover refrigerant during the maintenance, service, or repair of packaged A/C or refrigeration equipment with five pounds or less of refrigerant if they receive a passing grade on __________ examinations.
Type 1
Technicians are certified to recover refrigerant during the maintenance, service, or repair of high-pressure equipment if they receive a passing grade on which of the following examinations?
Type 2 (high pressure certificate)
In general, blended refrigerants should be charged:
as a liquid
The evacuation of a system is a method of:
dehydration.