Core
An award of up to what amount may be paid to a person supplying information that leads to a penalty again a technician who is intentionally venting? A) $5,000 B) $10,000 C) $27,000 D) $37,000
$10,000
State and local governments can make state laws that A) follow the clean air act/epa regulations B) contain stricter regulations than the clean air act/epa regulations C) ease or reduce the federal clean air act/ epa regulations D) both A and B
Both A and B
Which type of refrigerant is the most harmful to stratospheric ozone? A) CFC B) HCFC C) HFC D) ammonia
CFC
Of the refrigerants listed below, which refrigerant type have the highest ozone depletion potential? A) HCFC's B) HFC's C) CFC's D) all are equal
CFC's
Even though R-22 is considered non-toxic, it: A) is lighter than air B) can cause asphyxia C) is a class I refrigerant D) can be detected by its color
Can cause asphyxia
In a refrigeration system, the device changes a low pressure vapor to a high pressure vapor is the A) evaporator B) expansion device C) compressor D) condenser
Compressor
When dehydrating a system, the system can be heated to: A) avoid oxidation B) increase the oil's viscosity C) decrease the dehydration time D) increase the dehydration time
Decrease the dehydration time
The over- evacuation of a system: A) can cause tube, condenser and/or evaporator collapse B) damages vacuum gauge sets C) causes vacuum pump damage D) does not occur
Does not occur
Which gas(es) would cause the LEAST damage to the environment during a leak check? A) dry nitrogen and R-22 B) dry nitrogen and R-12 C) compressed air and R-12 D) dry nitrogen
Dry nitrogen
The type of oil that is most commonly used in stationary refrigertion applications with HFC-134a refrigerant is: A) ester oil B) alkylbenzene oil C) mineral oil D) all oils are compatible with HFC-410a
Ester oil
According to EPA regulations, which of the following is procedures is not an approved technique for system cleanup after a burnout? A) installing a suction line filter drier B) flushing with liquid refrigerant to clean tubing C) triple evacuation D) deep vacuum evacuation
Flushing with liquid refrigerant to clean tubing
Of the refrigerant listed below , the types of refrigerants will not damage stratospheric ozone? A) CFCs B) HCFCs C) HFCs D) they all damage the ozone
HFC's
HFC refrigerants contain: A) helium, fluorine, carbon B) helium, fluorine, calcium C) hydrogen, fluorine, chlorine D) hydrogen, fluorine, carbon
Hydrogen, fluorine, carbon
Non-Azeotropic refrigerants leak from a system A) faster than other refrigerant B) In uneven amount due to different vapor pressure C) slower than other refrigerants D) only if the joint fails completely
In uneven amount due to different vapor pressure
Blended refrigerants leaks from a system A) faster than other refrigerants B) in uneven amounts due to different vapor pressure C) slower than other refrigerants D) only if the joint fails completely
In uneven amounts due to different vapor pressure
What is one of the most serious results of damage to the ozone layer? A) mutations of patine plants B) increased volcanic activity C) increases in human skin cancer D) higher natural background radioactivity
Increases in human skin cancer
Refrigerant that enters the expansion or throttling device(also know as the metering device) is a A) saturated vapor B) superheated vapor C) mixture of vapor and liquid D) liquid
Liquid
refrigerant that enters the compressor, under normal operating conditiona is a: A) low pressure vapor B) low pressure liquid C) high pressure liquid D) high pressure vapor
Low pressure vapor
Ozone in the stratosphere above the earth consists of: A) molecules of 1 oxygen atom B) molecules of 2 oxygen atoms C) molecules of 3 oxygen atoms D) molecules of 4 oxygen atoms
Molecules of 3 oxygen atoms
It has been illegal to vent substitutes for CFC and HCFC refrigerants since: A) June 1, 1992 B) July 15, 1993 C) November 1993 D) November 1995
November 1995
We dealing with small systems, how many different refrigerants may be recovered into the same cylinder? A) only one B) only two C) any number as long as all are CFCs D) depends on the reclaim company
Only one
System charged with R-134a should be leak checked with: A) CFCs B) HCFCs C) compressed dry air D) pressurized nitrogen
Pressurized nitrogen
System charged with R-410a should be leak checked with A) CFCs B) HCFCs C) pressurized nitrogen D) compressed dry air
Pressurized nitrogen
A compound pressure gauge, typically used on the low side of the system, measures pressure in: A) psia B) torra and microns C) psig and inches of mercury D) psia and microns
Psig and inches of mercury
Which refrigerant is an HCFC? A) R-124 B) R-133a C) R-410a D) R-12
R-124
Which of the following is a"very high pressure refrigerant" under EPA refrigerant recycling regulations? A) R-22 B) R-134a C) R-13 D) R-500
R-13
An example of an HFC refrigerant is: A) R-12 B) R-22 C) R-123 D) R-134a
R-134a
Of the refrigerant listed below, which has the lowest depletion potential A) R-22 B) R-123 C) R-134a D) R-502
R-134a
Of the refrigerant listed below, which has the lowest ozone depletion potential? A) R-22 B) R-11 C) R-12 D) R-133
R-22
Which refrigerant contains an HCFC? A) R-12 B) R-22 C) R-134a D) R-410a
R-22
Which refrigerant is an HCFC? A) R-22 B) R-134a C) R-410a D) R-12
R-22
An example of a HFC refrigerant is: A) R-11 B) R-124 C) R-142b D) R-410a
R-410a
If an oil is hygroscopic it means that it: A) is a good lubricant B) is unrefined mineral oil C) readily absorbs moisture D) can be left open to the ambient air without picking up moisture
Readily absorbs moisture
____ is the process that returns refrigerant to new- product specifications and that requires chemical analysis? A)recovery B) recycle C) reclaim D) reprocess
Reclaim
If a technician has a system where some R-502 was added to an R-22 system. The technician should: A) can't all the refrigerant B) recycle all the refrigerant C) recover all the refrigerant into a separate tank D) recover and reuse all the refrigerant in another system
Recover all the refrigerant into a separate tank
Before you dispose of any system containing a refrigerant, you must: A) recover the refrigerant B) purge the system with nitrogen C) flush them system with R-11 or R-113 D) seal the system so no refrigerant can during disposal
Recover the refrigerant
During servicing of a refrigeration system containing R-12, the refrigerant must be: A) recovered B) recovered and replaced with R-134a, no exceptions! C) vented D) destroyed
Recovered
A cylinder with a gray body and a yellow top indicates that the cylinder is designed to hold: A) nitrogen B) inert gas C) only R-12 D) recovered refrigerant
Recovered refrigerant
______ is the process of removing refrigerant in any condition from a system and storing it in an external container without necessarily testing or processing it in any way. A) recycling B) recovering C) reclaiming D) restoring
Recovering
After 1995, any supplies of CFC refrigerant to service existing units in the USA can only come from: A) recovery and recycling B) solvent conversion C) European chemical manufactures D) third world chemical manufactured
Recovery and recycling
On a typical three port (three hose) manifold gauge, the center port is used for: A) obtaining gauge reading B) pumping air into system C) recovery, evacuation and charging D) by-pass from low to high side
Recovery, evacuation and charging
______________ refers to the process of cleaning refrigerant by oil separation and single or multiple passes the light filter driers, which reduce moisture and acidity? A)recycling B) recovering C) reclaiming D) restoring
Recycling
In a vapor compression refrigeration system, cooling occurs when: A) refrigerant liquid turns to a vapor B) refrigerant vapor turns to a liquid C) the refrigerant is under maximum pressure D) the refrigerant gives off heat
Refrigerant liquid turns to a vapor
Which type of refrigerant is the most harmful to stratospheric ozone? A) refrigerants containing Bromine B) refrigerants containing Chlorine C) refrigerants containing Hydrogen D) refrigerants containing fluoride
Refrigerants containing Bromine
The EPA can required a technician to demonstrate their ability to perform proper procedures for recovering and/or recycling refrigerant. Failure to demonstrate competency can result in: A) revocation is the technician's certification B) seizure of the technician's recovery or recycling equipment C) seizure of any refrigerant purchased by the technician which is still in his/her possession D) mandatory attendance at a refrigerant training camp
Revocation in the technician's certification
Refrigerant recovery during low ambient temperatures will: A) shorten recovery time, since the recovery tank is cold B) slow the recovery process C) minimize harmful emission D) require more frequent drier changes
Slow the recovery process
Which of the following gases help form the earth's protective shield A) chorine B) chlorides C) carbon monoxide D) stratospheric ozone
Stratospheric ozone
Refrigerant entering the compressor of a refrigeration system is a A) liquid B) sub-cooled liquid C) sub-cooled vapor D) super heated vapor
Super heated vapor
Recovery equipment that relies upon the compressor in the system would be considered A) system- dependent B) self- contained C) system independent D) self- sufficient
System- dependent
To determine the maximum allowable pressure to use when checking a system, check A) with the equipment owner B) with the refrigerant pressure/temperature tables C) the design pressure on the equipment nameplate D) ask the local utility company
The design pressure on the equipment
The size(capacity) of the vacuum pump and the size of the suction line used will determine: A) where the vacuum hose is connected to the system B) the length of dehydration time C) the type of refrigerant that should be used D) the viscosity of the oil that should be used
The length of dehydration time
Refrigerant migrates to the compressor crankcase because of the difference in _______ between the refrigerant and the oil. A) vapor pressure B) acidity C) volume D) density
Vapor pressure
Disposable refrigerant containers are used for ______ refrigerant A) recycled B) recovered C) virgin D) both a and b
Virgin
When evacuating a system, the hoses should be A) as short in length and as large in diameter as possible B) suitably sized to connect to a gauge manifold C) cooked and taped together D) colored red or bled to meet codes
as short in length and as large in diameter as possible
The proper method of discarding a disposable refrigerant cylinder is to: A) bleed refrigerant to ambient and throw the cylinder into a commercial trash dumpster B) assure that all refrigerant is recovered and that the cylinder is rendered useless, then recycle the metal C) refill the cylinder a second time at an approved facility D) giving the cylinder to a friend to be used as a compressed air tank
assure that all refrigerant is recovered and that the cylinder is rendered useless, then recycle the metal
To scarp a disposable cylinder the internal cylinder pressure should be reduced to at least A) 0 psig B) 15 psig C) 20 psig D) 28.8 psig
0 psig
The high pressure gauge on service manifold sets has a continuous scale usually calibrated to ready from A) 200 microns to 0 psi B) 0 to 250 psi C) 0 to 500 psi D) 200 psi to 750 psi
0 to 500 psi
Each chlorine atom in the stratosphere can be destroy _______ ozone molecules A) 100 B) 1,000 C) 10,000 D) 100,000
100,000
CFCs will no longer be manufactured or imported into the United States after: A) 1994 B) 1995 C) 1996 D) 1997
1995
Reusable refrigerant containers that are normally under pressure above 15 psig, must be hydrostatically tested and date stamped every: A) 1 year B) 2 years C) 3 years D) 5 years
5 years
A refillable refrigerant cylinder must never be filled to more than ________ of its capacity by weight: A) 70% B) 80% C) 90% D) 95%
80%
Ozone depletion potential, or"ODP" it A) always equal to twice the global warming potential, or "GWP" B) a absolute rating of the health hazard caused by ozone depletion C) a measure of the ability of CFC's and HCFC's destroy ozone D) a rating for ground level smog pollution
A measure of the ability of CFC's and HCFC's destroy ozone
The Montreal protocol is: A) an energy efficiency test developed by the Canadian government B) a test procedure for measuring the level of chlorine in the stratosphere C) a procedure or protocol to test for ozone concentration in the atmosphere D) a treaty among nations that controls production of CFC's and HCFC's
A treaty Amon nations that controls production of CFC's and HCFC's
According to ASHRAE's 1992 refrigerant safety classification, which designations is the most safe A) A-1 B) A-3 C) B-1 D) B-3
A-1
Under EPA regulations what standard must be reclaimed refrigerant meet before it can be resold A) ARI 700 B) ARI 740 C) EPA 700 D) UL 740
ARI 700
According to the EPA, when dealing with customer complaints regarding additional costs due to refrigerant recovery efforts, the technician should: A) explain the refrigerant recovery is necessary to protect human health and the environment B) explain that refrigerant recovery is required by Federal( and in some cases state and local) laws C) inform the customer that professional service personnel are duty bound to follow the law and to protect the environment D) all of the above
All of the above
Of the listens listed below, which is(are) violation(s) of the clean air act? A) falsifying or failing to keep required records B) failing to reach required evacuation levels before opening or disposing of appliances C) knowingly releasing CFC or HCFC or their substitutes while repairing appliances D) all of the above
All of the above
Refrigerant cylinder should always be A) free of rust and damage B) color coded to indicate the contents C) secure D) all of the above
All of the above
Refrigeration technician who violate the clean air act can: A) lose their epa certification B) be fined C) be required to appear in federal court D) all of the above
All of the above
The Clean Air ACT: A) sets a schedule for the phase out of CFC/HCFC production B) prohibits venting of refrigerants C) authorizes the EPA to set standards for recovery of refrigerants D) all of the above
All of the above
The recovery of refrigerants is necessary to: A) maintain adequate supplies for service calls after the production bans B) prevent the venting of refrigerants to the atmosphere C) percent stratospheric ozone depletion D) all of the above
All of the above
What effects can ozone depletion have on the environment? A) reduces crop yields B) reduced marine life C) increased ground- level ozone D) all of the above
All of the above
When operating refrigerant recovery or recycling equipment, the following precautions should always be followed A) wear safety glasses B) wear protective gloves C) following all safety precautions for the equipment D) all of the above
All of the above
Which chemicals are controlled by the Montreal Protocol? A) chlorofluorocarbons B) hydrochlorofluorocarbons C) halons D) all of the above
All of the above
Which of the following statements would be considered good service practices for conserving refrigerant? A) recover of recycle refrigerant B) keep systems tight C) find and repair leaks D) all of the above
All of the above
R-410A is not a typical blended refrigerant because: A) it is a near azeotropic refrigerant B) it can be charged as either a liquid or vapor C) while it has a 400 series refrigerant number it behaves like a 500 series refrigerant D) all of the above are true
All of the above are true
Which refrigerant must be recovered before opening a system or disposing of a system? A) R-410a B) R-407C C) R-134a D) all refrigerant must be recovered
All refrigerant must be recovered
All recovery equipment currently being made is required to have: A) a calibration stamp or label B) an epa approved certification label C) oil- less reciprocating compressor D) manual triple shut off
An epa approved certification label
Which of the following human effects could result from an increase in ultraviolet radiation? A) an increase in cataracts cases B) an increase in male infertility cases C) an increase in heat prostration with the elderly D) an increase in the number of thyroid disorders
An increase in cataracts cases
Use_______ to remove ice from a sight glass A) an alcohol spray B) water C) R-11 refrigerant D) a screw driver or flat file
And alcohol spray
HCFC refrigerants: A) are more harmful to stratospheric ozone than CFCs B) do not damage stratospheric ozone at in any way. C) are less harmful to stratospheric ozone than CFCs D) are more harmful than bride containing compounds
Are less harmful to stratospheric ozone than CFCs
In general, blended refrigerants should be charged: A) as a vapor B) at very high temperatures C) as a liquid D) the same way any other refrigerant
As a liquid
To obtain an accurate vacuum reading during system evacuation, the system vacuum gauge should be located: A) as the pump discharge B) as far from the vacuum pump as possible C) directly at the pump suction D) anywhere in the evacuation service hose
As far from the vacuum pump as possible
What statement is true about an azeotropic refrigerant mixture? A) it is always make from just two components B) it has a pressure temperature curve identical to one of its components C) it is a mixture that is always made from at least three component refrigerants D) it is a mixture that acts like a single component refrigerant over its entire range
it is a mixture that acts like a single component refrigerant over its entire range
It is illegal to: A) use CFC refrigerants B) manufactured or import HFC refrigerants into the US C) knowingly release any refrigerants during the service , maintenance, repair or disposal of appliances, with the exception of the mínimos releases. D) do any of the above
knowingly release any refrigerants during the service , maintenance, repair or disposal of appliances, with the exception of the mínimos releases.
What is the best proof that CFCs are in the stratosphere? A) the theory of some professors in California B) measurement of CFCs in smog C) measurement of CFCs in air samples from the stratosphere D) measurement of the other man-made compounds in air samples from the stratosphere
measurement of CFCs in air samples from the stratosphere
Never use oxygen or compressed air to pressurize a sytem because: A) when mixed with compressor oil or some refrigerants it could explode B) leaking oxygen or compressed air are most difficult to detect than nitrogen C) the pressure produced by either oxygen or compressed air are not as good as nitrogen pressures D) oxygen and compressed air do not mix with refrigerants
when mixed with compressor oil or some refrigerants it could explode
"Self contained" recovery devices A) are evacuated recovery cylinders capable of liquid transfer B) can capture liquid and/or vapor refrigerant without the assistance of componentes in the air conditioning or refrigeration equipment C) have a self contained power source that requires recharging or battery replacement D) can only be used on air-conditioning and refrigeration equipment containing less than 15 pounds of refrigerant
can capture liquid and/or vapor refrigerant without the assistance of componentes in the air conditioning or refrigeration equipment
The chemical was found in the upper stratosphere and that indicates that the ozone layer is being destroyed A) chlorine monoxide B) carbon monoxide C) carbon dioxide D) nitrogen dioxide
chlorine monoxide
CFC refrigerants are so named because they contain the elements: A) chlorine, fluorine, carbon B) chlorine, fluorine , calcium C) carbón, fluoride, calcium D) chlorine, fluorine, hydrogen
chlorine, fluorine, carbon
It is important not to mix different refrigerants in the same container because: A) the mixture may be impossible to reclaim B) the mixture will explode C) the refrigerant mixture might be toxic D) it violates EPA environmental regulations
The mixture may be impossible to reclaim
A hermetic compressor must never be operated when: A) the compressor is operating under light load B) the compressor is operating under full load C) there is a dehydration vacuum in the system D) the outdoor temperature is above 125F
There is a dehydration vacuum in the system
Refrigerant vapor or mist should not be inhaled because A) they are addictive B) they can lower the body's core temperature C) they can cause skin cancer D) they may cause heart irregularities and/ or unconsciousness
They may cause heart irregularities and/ or unconsciousness
Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons(HCFCs) have which of the following in common? A) they have identical ODPs B) they both contain hydrogen C) they have the same normal boiling points D) they must be recovered before opening or disposing of appliances
They must be recovered before opening or disposing of appliances
A ternary refrigerant blend is a ____ part mixture A) two part B) three part C) four part D) five part
Three part
The color code for approved refrigerant recovery cylinder is________ A) gray top and yellow bodies B) blue tops and green bodies C) yellow top and gray bodies D) green tops and gray bodies
Yellow top and gray bodies
According to the EPA, a _________ leak detection methods is considered to be the most effective for locating the general area of a small leak. A) Standing vacuum test B) electronic or ultrasonic tester C) halide torch D) audible sound
electronic or ultrasonic tester
Refrigerant can not be called "reclaimed" unless it: A) was processed in a reclaiming machine B) has been chemically analyzes and the refrigerant meets the ARI-700 purity standard C) is recovered from a system less than 1 year old D) is recovered from a system still under warrantee
has been chemically analyzes and the refrigerant meets the ARI-700 purity standard
What characteristic of CFC make them more likely to reach the stratosphere than other compounds containing chlorine? A) refrigerants that contain chlorine but not hydrogen are so stable that they do not break down in the lower atmosphere after being released. The chlorine or bromine reacts with ozone, causing it to change back to oxygen, thus destroying the ozone layer B) CFCs are lighter than other damaging compounds, making it easier for them to float upward when released C) CFCs are attracted to the static in the atmosphere D) CFCs are attracted to dust in the atmosphere
refrigerants that contain chlorine but not hydrogen are so stable that they do not break down in the lower atmosphere after being released. The chlorine or bromine reacts with ozone, causing it to change back to oxygen, thus destroying the ozone layer
Whenever dry nitrogen from a portable cyclinder is connected to a system, what item is of most importance to consider for safety? A) the regulator has a new set of gauges B) the pressure gauges are clean C) there is a relief valve in the downstream line from the pressure regulator D) no refrigerant line can leak
there is a relief valve in the downstream line from the pressure regulator