EPA Flashcards
\_\_\_\_\_\_\_ has the highest ozone depletion potential (ODP) a. HFC b. CFC C. HCFC D. None
B
By what year was the use of halons completely phased out?
a. 1987
b. 1989
c. 1994
d. 1995
c
What is believed to be the lifetime range of CFCs?
a. 5 to 10 years
b. 20 to 100 years
c. 100 to 500 years
d. over 1000 years
b
Corrosion in refrigerent appliances results from a pH level that is
a. acidic
b. basic
c. either
d. none
a
Up to how many ozone molecules may be destroyed by exposure to one chlorine atom in the stratosphere?
a. 100
b. 1000
c. 10000
d. 100000
D
What is indicated when during each vacuum decay test the pressure of the system increases to greater than 0 psig but stops at some point after creating the vacuum?
a. the refrigerent could be trapped in the system
b. a leak without the trapped refrigerant
c. impossible to know
d. none
a
Which gas is used to pressurize (for leak checking) or blow debris out of the system, after recovering the refrigerent from a sealed system?
a. hydrogen
b. oxygen
c. carbon dioxide
d. nitrogen gas
d
Recovery rate will be ______ if your recovery unit does not have a subcooling feature.
a. slower
b. faster
c. recovery rate is independent
d. none
a
Which of the following methods is the least effective at detecting the general area of a small leak?
a. electronic tester
b. fluorescent indicator
c. ultrasonic tester
d. none
b
T/F A vacuum test can detect a leak
F
The refrigerant changes from high pressure vapor to a high pressure liquid during
a. expansion
b. condensation
c. compression
d. evaporation
b
The refrigerant can be reclaimed if it meets the \_\_\_\_\_\_\_ purity standard a. ARI-740 b. ARI-360 c. ARi-700 D. ARI-1024
C
The thermostatic expansion valve (TXV) maintains the appropriate pressure difference between ________ and _________ of the system.
a. expansion valve, evaporator
b. evaporator, compressor
c. compressor, condenser
d. condenser, evaporator
D
What are the colors of the painted tank of the recovered refrigerant?
a. Gray with blue top
b. yellow with gray top
c. gray with yellow top
d. blue with yellow top
c
The refrigerant recovery cylinder must not exceed what percentage of its capacity?
a. 80%
b. 75%
c. 70%
d. 65%
A
Refrigerated appliances are divided by the EPA into how many groups?
a. six
b. five
c. four
d. three
B
A fine of up to _______ per day per violation can be administered to violators of the Clean Air Act, which includes improper record keeping.
a. 20,000
b. 30,000
c. 37,500
d. 40,000
C
The _______ connects the evaporator to the compressor in a refrigerant system.
a. evaporation line
b. discharge line
c. suction line
d. liquid line
C
In what state can the refrigerant be transferred or sold to another individual?
a. reclaimed
b. disosed
c. recycled
d. recovered
a
A recovery cylinder can store up to how many refrigerants?
a. one
b. two
c. three
d. four
A
In a low pressure refrigerated appliance which of the following refrigerants is to be used?
a. R-114
b. R-500
c. R-123
d. R-12
c
To which of the following refrigerant groups does R-134a belongs?
a. CFC
b. HFC
c. HCFC
B
Under what EPA section are motor vehicle air conditioning (MVAC) service technicians governed?
a. 508
b. 509
c. 608
d. 609
d
What is formed by the reaction between nitrogen and hydrogen?
a. amonia
b. nitrogen hydride
c. nitrogen hydroxide
d. nitrogen does not react with hydrogen
A
T/F If there is a leak, a vacuum test allows air and moisture to enter the system.
T
The stability of the ozone is depleted by the presence of which of the following organic refrigerant compounds?
a. hydrogen
b. bromine
c. chlorine
d. all options
A
What connects the condenser to the expansion device?
a. discharge line
b. suction line
c. liquid line
d. expansion line
C.
To meet the requirements of ARI 740, recovery and recycling equipment intented for use must be manufactured after what date?
a. Dec 31, 1994
b. Jan 1, 1995
c. Dec 31,1995
d. Nov 15, 1993
d
What is the reason two refrigerants are not allowed to be collected into one recovery cylinder?
a. impossible to recover two refrigerants from one mixture
b. the refrigerant mixture can react with each other and explode
c. both the options are correct
A
What is the color of the pressure port of the manifold pressure gauge that is connected to the low pressure side of the system?
a. red
b. blue
c. green
d. yellow
b
CFCs are broken down and freed of chlorine ion at the stratosphere by which of the following properties?
a. infared radiation
b. x- rays
c. ultraviolet radiation
d. gamma radiation
c
When the vacuum pumpp being used is too large, water removal from the system will become
a. easier
b. more difficult
c. remain the same
b
What method is used in the case of absence of a label identifying the refrigerant?
a. pressure temperature method
b. density volume method
c. density temperature method
d. all the options are correct
a
While checking the pressure of the system, which of the following is used to minimize the leakage of the refrigerant?
a. Self sealing hoses
b. either can be used
c. hand valves
d. either can be used
B
Just upstream of the ________ inlet should be located this suction line filter drier.
a. expansion valve
b. compressor
c. condenser
d. evaporator
B
The diameter of the liquid line must be as _______ as possible to minimize the total refrigerant pressure drop.
a. small
b. large
B
The following type of leak detector works by drawing the vapor into the system and heating it
a. helium leak detector
b. ultrasonic leak tester
c. electronic leak detector
d. fluorescent leak detector
c
T/ F If the recovered refrigerants are clean, they can be returned to the same system or other systems owned by the same person without restriction.
T
T/F At the stratosphere, ozone is an unstable molecule.
T
Refrigeration technicians in violation of the clean air act are subject to
a. appearance in federal court
b. fines
c. loss of EPA certification
d. all the options are correct
D
The push pull recovery method of refrigeration is used with
a. single valve recovery tank
b. dual valve recovery tank
c. triple valve recovery tank
d. quadruple recovery tank
b
What is the typical psi of a low pressure system pressure relief valve?
a. 25 psi
b. 20 psi
c. 15 psi
d. 10 psi
c
CFC- 11 and CFC-12 ozone depleting substances contribute what percentage of stratospheric chlorine?
a. 18%
b. 51%
c. 70%
d. 82%
b
According to EPA requirements, systems that contain up to how many pounds or more of refrigerant have to have “substantial leaks” repaired within 30 days?
a. 10 lbs
b. 25 lbs
c. 50 lbs
d. 100 lbs
C
The suction line in a refrigeration system consists of which of the following?
a. cold water
b. warm liquid
c. hot vapor
d. cool vapor
D
Flushing agents should be introduced into a refrigeration system through which of the following?
a. compressor
b. condenser lines
c. evaporator
d. condenser
A
What kind of refrigerant can be transferred to a new owner?
a. recycled
b. recovered
c. renewed
d. reclaimed
D
After evacuation of refrigerants, what should the pressure of nitrogen be when introduced into the evacuation system?
a. slighly over the atmosopheric temperature
b. equal to the atmospheric pressure
c. any atmospheric pressure
d. slightly lower than the atmospheric pressure
a
T/F The process of reclaimation and recyling of refrigerants are the same.
F
T/F CFCs are highly reactive in lower levels of the atmospher.
F
In what year was the Montreal Protocal signed?
a. 1987
b. 1989
c. 1995
d. 1999
A
What kind of recovery is the fastest and takes up lesss volume per pound of refrigerant to recover?
a. liquid
b. gas
c. neither liquid nor gas
d. either liquid or gas
a
How often must reusable containers for refrigerants be date-stamped and hydrostatically tested?
a. every year
b. every 2 years
c. every 3 years
d. every 5 years
d
In very high pressure appliances, which of the following refrigerants is used?
a. R-50
b. R-410a
c. R-500
d. R-503
d
What is the proper protocol for purged nitrogen gas?
a. evacuated into a separate container and sent to EPA
b. evacuated in to separate container and disposed of
c. vented to atmosphere
d. evacuated into separate container and recycled
c
Regarding recovery time, what is the result of using long hoses between the unit and the recovery machine?
a. decrease in recovery time
b. increase in recovery time
c. has no impact on recovery time
b
Which one of the following has ozone depletion potential (ODP) value of 1?
a. CFC-12
b. CFC-11
c. HCFC-22
d. HCFC-23
b
T/F Dehydration evacuation does not remove mineral oil or acid trapped in the oil.
T
Where in the refrigeration system is the refrigerant a warm liquid?
a. expansion line
b. suction line
c. discharge line
d. liquid line
d
Which device is located at the end of the liquid line?
a. evaporator
b. compressor
c. expansion device
d. condenser
c
What type of refrigerant is used with medium-pressure appliances?
a. R-11
b. R-410a
c. R-500
d. R-503
c
When a refrigerant is in the discharge line, it will be in which of the following phases?
a. cold vapor
b. hot vapor
c. cold liquid
d. hot liquid
b
During evacuation of the refrigerant, how will a suction hose with a larger diameter affect the recovery rate of the refrigerant?
a. slow the process
b. speed the process
b
To obtaing the most accurate reading during the evacuation process, the vacuum gauge should be located as _________ as possible from the vacuum pump.
a. distance between vacuum pump and vacuum gauge does not have any effect
b. far
c. near
c
Why is oil used in the compressor?
a. to seal the moving parts of the compressor
b. to lubricate
c. both
c
On what type of equipment are Schrader valves present?
a. refrigerant systems
b. recovery equipment
c. both
c
What poisonous substance is formed when refrigerants are exposed to flames or steam?
a. carbonyl halides
b. hydrofluoric acid
c. phosphene gas
d. all the options are coorect
d
What substance is used to remove ice in case of icing on the sight glass?
a. liquid nitrogen
b. qwikshot acid flush
c. liquid ammonia
d. alcohol spray
d
Which refrigerant has the lowest ozone depletion potential?
a. CFC-12
b. HCFC
c. HFC
d. all the options are correct
c
Which of the following refrigerants is compatible with disposable cylinders?
a. recovery refrigerant
b. virgin refrigerant
c. both
b
Which of the following devices makes a high temperature, high pressure, superheated refrigerant vapor from a low pressure, low temperture refrigerant vapor?
a. compressor
b. condenser
c. evaporator
d. expansion device
a
T/F In a refrigeration system, the warmer the temperature the slower it will evacuate.
F
T/F All refrigerant oils are hygroscopic
T
What substance is obtained when ozone reacts with chlorine ion?
a. oxygen
b. HCI
c. fluorine
d. all options
a
T/F It may be impossible to reclaim mixed refrigerants in the same tank.
T
Which of the following will not cause an explosion when mixed with refrigerants?
a. compressed hydrogen
b. compressed air
c. compressed nitrogen
d. oxygen
c
What is the most effective method for checking for small leaks?
a. halide torch
b. visual oil-soluble dye indicator
c. fluorescent dye indicator
d. all the options are correct
d
T/F The only two mandatory recovery refrigerants are CFCs and HCFCs.
F
What percentage of the ozone layer is occupied by the stratosphere?
a. 20%
b. 50%
c. 70%
d. 90%
d
What is the color of the center port of the service manifold hose?
a. red
b. green
c. blue
d. yellow
D
What describes the weight of the smallest cylinder a 608-certified technician may purchase?
a. 15lbs
b. 20lbs
c. 25lbs
d. 50lbs
b
Up to how much award money is offered by the EPA to individuals who report information about technicians who intentionally vent refrigerants into the atmosophe against protocal?
a. $5000
b. $10000
c. $20000
d. $25000
b
Which of the following does not belong to the group?
a. reuse
b. recycle
c. reclaim
d. recovery
a
Which of the following gases has the greatest capacity to determine a systems leak?
a. nitrogen
b. oxygen
c. hydrogen
d. carbon dioxide
a
What describes the process of cleaning the refrigerant for immediate use?
a. decover
b. reclaim
c. recycle
c
What number mixture of refrigerants suits the ternary blend refrigerants?
a. two
b. three
c. four
d. five
b
In which of the following refrigeration cycles is the condensor present?
a. high pressure side
b. low pressure side
a
In which of the following appliances is R-134a refrigerant used?
a. low pressure appliance
b. medium pressure appliance
c. high pressure appliance
c
What is measured by the compound gauge of the gauge manufold set?
a. low pressure
b. high pressure
c. discharge pressure
d. all options
a
About how many miles from the earth’s surface does the stratosophere extend?
a. 10
b. 30
c. 50
d. 70
b
In new residential and small commercial heat pump and air conditioning systems,which of the following refrigerants is commonly used in place of R-22
a. R-116
b. R-123
c. R-124
d. R-410a
d
In what phase are refrigerants in the suction line?
a. low pressure vapor
b. high pressure vapor
c. warm liquid
d. cold liquid
a
When the saturation temperture in the evaporator causes the refrigerant to charge from a liquid to a vapor ______ occurs.
a. dew point
b. evaporation point
c. saturation point
d. bubble point
a
To which refrigerant group does R-22 belong?
a. CFC
b. HCFC
c. HFC
d. none of the above
b
The rise in the amount of chlorine measured in the stratosphere over the past two decades matches the rise in which of the following elements?
a. hydrigen
b. iodine
c. bromine
d. fluorine
d
When the refrigerant system is warmer than the cylinder, the refrigerant recovery rate will be
a. faster
b. slower
c. independent
d. unclear
a
Which leak detector audits possible gas leakage?
a. fluorescent leak detector
b. vacuum leak detector
c. helium leak detector
d. ultrasonic leak detector
d
Which of the following rules are enacted in the Clean Air Act?
a. proper disposal is required
b. proper venting
c. set dates to phase out CFCs and HCFCs
d. all the options are correct
d
What percentage of stratospheric chlorine comes from ozone depleting substance?
a. 18%
b. 51%
c. 72%
d. 82%
d
When was the Montreal Protocol substantially amended?
a. 1992
b. 1994
c. 1998
d. 2000
a
Which one of the following is an HCFC regrigerant?
a. r-11
b. r-22
c. r-113
d. r-410
b
When will the ban on the production or importing of any HCFC refrigerant take effect?
a. 2017
b. 2018
c. 2020
d. 2024
c
Many refillable cylinders have which of the following attachments to automatically shut off the system when the storage tank level exceeds the 80% full?
a. internal magnetic reed float valves
b. electronic shut off device
c. either
c
What explains the purpose of recovery?
a. to prevent stratospheric ozone depletion?
b. to provide adequate supplies for service after production bans
c. to prevent veting into the atmosophere
d. all options are correct
d
What is the range of calibration of the high pressure of gauge maniflod?
a. 0 to 100psi
b. 0 to 200psi
c. 0 to 500psi
d. 0 to 1000psi
c
T/F In the evacuation system, vacuum lines (hoses) should be equal to or larger than the pump intake connection.
T
T/F The most effective method for checking small leaks uses a halide torch.
T
T/F The refrigerant recovery rate will be ________ than the smaller the refrigerant system size.
a. slower
b. faster
B
Only cylinders designated as “refillable” by the _______ cna be used for refrigerant recovery.
a. Department of Transportation (DOT)
b. EPA
c. Clean Air Act (CAA)
d. ASHRAE
A
UV radiation can cause which of the following: 1) Suppression of the immune system 2) Increase in skin cancers and cataracts?
a. Option 1
b. Option 2
c. Both option 1 and option 2
d. Neither options
C
Disposable cylinders consist of which of the following?
a. One-way valve
b. Two-way valve
c. Three-way valve
d. Will have no valves
A
Which of the following gas is used when checking for leaks in a system?
a. Compressed air
b. Oxygen
c. Hydrogen
d. Nitrogen
D
At rates of about __________ per year, the electronic leak detector cna detect leaks.
a. 0.1oz
b. 0.5oz
c. 1 oz
d. 10oz
b
In which part of the refrigeration cycle is the evaporator located?
a. high pressure side
b. low pressure side
B
Which of the following refrigerants does the Montreal Protocol agrements not phase out?
a. HFCs
b. HCFCs
c. CFCs
d. Halos
a
Before it can be sold, what standard must reclaimed refrigerants meet?
a. ARI 500
b. ARI 700
c. ARI 740
d. ARI 1000
b
During which phase will refrigerants be in a state of high pressure hot vapor?
a. liquid line
b. suction line
c. expansion line
d. discharge line
d
What is the state of nitrogen when it is used to pressurize the system?
a. liquid
b. gaseous
c. either liquid or gaseous
b
What is the fastest method of dehydrating a system?
a. Dual evacuation
b. Triple evacuation
c. Quadruple evacuation
d. All options are correct
b
Which one of the following refrigerants contribute to global warming?
a. CFC
b. HCF
c. HCFC
d. All options are correct
D
When an appliance contains ___________ or more pounds of refrigerant, the servicing technician must provide the owner with an invoice that indicates the amount of refrigerant added to the appliance.
a. 20 pounds
b. 40 pounds
c. 50 pounds
d. 60 pounds
c
What percentage of the earth’s atmosphere does nitrogen constitute?
a. 66%
b. 75%
c. 78%
d. 80%
c
In what year will the HCFC ban extend to all HCFCs for use in new systems?
a. January 1, 2018
b. January 1, 2018
c. January 1, 2020
d. January 1, 2015
d
T/F The ozone depletion potential of CFCs is higher than HCFCs.
T
Refrigeration technicians who violate the Clean Air Act becomes subject to
a. heavy fines
b. appearance in Federal Court
c. loss of their EPA certification
d. all the options are correct
d
Which of the following is an undesirable property of a good refrigerant?
a. Low specific heat
b. High boiling point
c. High latent heat
d. high miscibility with lubricating oil
b
What is the temperature at which refrigerants begin to evaporate?
a. bubble point
b. saturation point
c. dew point
d. condensing point
a
What is the color of the high pressure gauge of a gauge manifold? a. Red b. Green c. Yellow D. Blue
a
Which of the following has the lowest malecular weight?
a. Carbon dioxide
b. Helium
c. Oxygen
d. Nitrogen
b
What is the name of the amount of heat required to change the refrigerant from a liquid to a gas?
a. enthalpy
b. latent heat
c. total heat
d. sensible heat
b
T/F The condenser rejects heat from the system
T
Which phase is the refrigerant in when the refrigerant leaves the evaporator?
a. High pressure, high temperature vapor
b. High pressure, high temperature liquid
c. Low pressure, low temperature
d. Low pressure, low temperature vapor
c
What happen to the boiling point of the refrigeration liquid as the pressure on the refrigeration liquid increases?
a. Increases
b. Decreases
c. Remains unaltered
a
T/F HFCs are highly stable in lower parts of the atmosphere.
F
Refrigerant leaks depends mostly on
a. viscosity
b. specific heat
c. compressibility
d. molecular weight
d
A lack of which of the following may cause asphyxiation?
a. Oxygen
b. Hydrogen
c. Air
d. Carbon dioxide
A
An ozone depletion potential of 1 is a quality of which of the following refrigerants?
a. R-11
b. R-12
c. R-22
d. R-23
a
One may determine that refrigerants are still trapped in the system during a vacuum leak test, if the measure pressure increases by
a. over 0 psig
b. less than 0 psig
c. 0 psig
A
What is the EPA’s definition of a substantial leak increase percentage for industrial process and commercial refrigeration systems?
a. 15%
b. 20%
c. 35%
d. 50%
c
T/F Natural refrigerants such as carbon dioxide and hydro carbons (propane) have high Global Warming Potential (GWP) compared to HFCs.
F
When refrigerants are in the suction line, they are in what phase and state?
a. Warm liquid
b. Cold liquid
c. Hot Vapor
d. Cold Vapor
D
After what date will the servicing of R-22 based systems rely on recycled refrigerants?
a. 1st Jan, 2015
b. 1st Jan, 2018
c. 1st Jan, 2020
d. 1st Jan, 2022
c
In the case of a refrigerant leak, what color will the flame turn during a halide torch leak test?
a. Blue
b. Yellow
c. Red
d. Green
d
Which of the following is the R-500 refrigerant?
a. HCFCs
b. HCFs
c. CFCs
C
In pounds per square inch, what is the pressure of the atmosophere?
a. 1.47
b. 14.7
c. 147
d. 1470
b
According to Clean Air Act (CAA), R-22 must be
a. Destroyed
b. Recovered and Recycled
c. Reclaimed
d. All the options are correct
D
Natural sources such as volcano eruptions contribute to what percentage of stratospheric chlorine?
a. 18%
b. 30%
c. 35%
d. 40%
a
What is the name of the Chemical formed at the stratosphere, which is unstable, and characteristically strips a free oxygen atom and then releases the chlorine ion which continues the chain reaction of destroying ozone molecules?
a. Chlorine oxide
b. Chlorine trioxide
c. Chlorine dioxide
d. Chlorine monoxide
d
The reaction of refrigerants with water is
a. Electrolysis
b. Hydrolysis
c. Aquesistion
d. Distillation
b
Which of the following gases is used to hold charge or so as to release leak test gases?
a. Compresssed air
b. Hydrogen
c. Nitrogen
d. Oxygen
C
In which of the following configurations will relief valves in the refrigeration system be?
a. Parallel
b. Series
c. Either series or parallel
a
T/F HFC refrigerants have Zero Ozone Depletion Potential and Zero Global Warming potential.
F
If the temperature of the refrigerant is warmer, there will be a _______ evacuation of the refrigerant from the refrigeration system.
a. faster
b. slower
c. will have no effet
a
If the temperature of the refrigerant is warmer, there will be a _______ evacuation of the refrigerant from the refrigeration system.
a. faster
b. slower
c. will have no effet
a
What letter represents the refrigerant with a higher toxicity?
a. A
b. B
c. C
d. D
b
What is thecolor of the compound gauge that measures low pressure and vacuum?
a. Red
b. Yellow
c. Green
d. Blue
D
What phase describes the refrigerant when it is in the condenser?
a. Low pressure liquid
b. High pressure vapor
c. High pressure liquid
d. Low pressure vapor
c
What is the name of the process in which refrigerants are at the level of new product specifications as determined by chemical analysis?
a. Recycle
b. Reclaim
c. Report
b
To make a refrigerant saturated and change its state by condensing it requires what kind of heat?
a. Total heat
b. Super heat
c. Latent heat
d. Sensible heat
B
Class I Refrigerants will have an ozone depletion potential greater than
a. 0.2
b. 0.8
c. 1
d. 2
A
When a cylinder is exposed to heat and is in risk of explosion, which of the following increases?
a. Pressure
b. Density
c. Volume
d. All options are correct
a
Up to how many miles above the earth’s surface does the ozone layer in the stratosophere extend?
a. 15
b. 30
c. 60
d. 100
b
Knowingly venting any refrigerant has been a violation of CAA since what date?
a. Nov 15, 1995
b. Nov 30, 1995
c. Dec 31, 1996
d. Jan 1, 1997
a
T/F Recovery cylinders are designed to be refilled.
T
What is the name for the temperature at which non-azeotropic blends first begins to condense?
a. Bubble point
b. Saturation point
c. Dew point
d. Sensible point
c
What is the penalty, per day per violation, for improper record keeping, as per CAA?
a. $10,000
b. $22,500
c. $32,500
d. $37,500
D
Which of the following is an example of an HFC?
a. R-22
b. R-123
c. R-134a
d. R-500
C
Before it can be resold, what standard must a reclaimed refrigerant meet?
a. ARI 700
b. ARI 1000
c. ASHRAE 1000
d. ASHRAE 700
A
When the refrigeration system is more moist, it will take the refrigerant \_\_\_\_\_ to evacuate. a. Longer b. Shorter c. Larger D. Moisture has no effect
A
What happens to the recovery process of the refrigerants when the ambient temperature becomes colder?
a. Shorter
b. Temperature has no effect
c. Longer
C
T/F Before opening a system for service, CFCs and HCFCs must be recovered.
T
T/F REfrigerant oil must be miscible at high temperature.
F
During a halide torch test, what material is heated by hydrocarbon fuel as refrigeerant air is drawn ovr it?
a. Copper
b. Nickel
c. Silver
d. Tungsten
a
Which of the following is not a result of stratospheric ozone depletion?
a. Reduced marine life
b. Skin cancer
c. Crop loss
d. Reforestation
D
During the asphyxiation, what happens in the blood caused by respiratory interference?
a. Lack of carbon dioxide
b. Lack of nitrogen
c. Lack of oxygen
d. Lack of refrigerant
C
On what date were CFCs phased out?
a. Jan 1, 1995
b. Dec 31, 1996
c. Jan 1, 1996
d. Dec 31, 1995
D
T/ F Ozone at ground level is considered to be undersirable and a pollutant.
T
Cleaning refrigerants for immediate ise by removing oil, moisture, and acidity from the refrigerant by using filter dries has to do with which of the following processes?
a. Reuse
b. Recycle
c. Reclaim
d. Recover
b
When chlorine atoms react with ozone molecules, which of the following compounds is obtained?
a. Chlorine oxide
b. Chlorine monoxide
c. Chlorine peroxide
d. Chlorine dioxide
b
The lowest ozone depletion potential belongs to which of the following?
a. Class IV refrigerant
b. Class I refrigerant
c. Class II refrigerant
d. Class III refrigerant
C
T/F The condenser rejects heat from the system and changes high pressure and high temperature refrigerant vapor to low pressure low temperature refrigerant vapor.
F
In which region or area is stratospheric ozone depletion a series problem?
a. Global
b. Asia
c. Antartica
d. North America
A
During the recovery process, what is indicated to be burned out in case of the detection of a strong odor?
a. Compressor
b. Condenser
c. Evaporator
d. All the options are correct
A
T/F Recovery cylinders are not specifically designed.
F
On what date were CFCs phased out of production, as per the Montreal Protocol?
a. December 31, 1994
b. December 31, 1995
c. November 14, 1994
d. November 14, 1995
b
What is the possible consequence service technicians who violate Clean Air Act provisions may be?
a. Loss of certification
b. Fines
c. Court apperearance
d. All options are correct
D
When was the Montreal Protocol enacted?
a. 1988
b. 1989
c. 1991
d. 1992
b
What quality of ozone depletion potential belongs to R-134a?
a. Zero
b. Low
c. High
d. Unity
a
T/F The temperature of the earth is stably maintained in part by the ozone.
T
The rise in the amount of what substance matches the rise in the amount of chlorine measured in the stratosphere over the past two decades?
a. Oxygen
b. Hydrogen
c. Fluorine
d. Hydrogen
C
T/F Hygroscopic oil has a high affinity for water.
T
What happens to the speed of the recovery when the ambient temperature is lower?
a. slower
b. faster
a
T/F A recovery cylinder can fit and recover a maximum of three types of refrigerants.
F
During evacuation, a heated refrigeration system will result in a ______ dehydration time.
a. Increased
b. Decreased
c. No effect
b
Before it can be resold, a reclaimed refrigerant must meet the standards set forth in
a. ARI 1200
b. ARI 750
c. ARI 700
d. ARI 1000
C
Up to how many ozone molecules can a single chlorine atome destroy?
a. 1,000
b. 10,000
c. 1,000,000
d. 10,000,000
c
Every _________ years, refillable cylinders must be hydristatically tested and date stamped.
a. 1.5
b. 2
c. 3a
d. 5
d
On which of the following arrangements must relief valves be installed?
a. Series
b. Parallel
c. Either series or parallel
b
What is the name of the process which transforms refrigerants to a level equal to new (virgin) product specifications as determined by chemical analysis?
a. Recover
b. Reclaim
c. Recycle
d. Repair
b
Which device is used to pinpoint leaks in the refrigeration systems?
a. Electronic leak detector
b. Ultrasonic leak detector
c. Soup bubbles
C
T/F Most refrigerant oils will mix with R-134A.
F
T/F There is no temoerature glide in an azeotrope mixture
T
The sale of CFC and HCFC refrigerants become restricted to certified technicians only after what date?
a. Nov 14, 1994
b. Dec 31, 1994
c. Dec 31, 1995
d. Nov 14, 1995
a
Refrigerants are _________ than air.
a. lighter
b. heavier
heavier
T/F Refrigeration cylinders should not be transported in an upright position.
F
What kind of drier could be installed to trap any debris that may damage the compressor
a. Liquid line filter
b. Vapor line filter
c. Suction line filter
d. Discharge line filter
C
How many miles above sea level is the stratosophere located
a. 10 to 30 miles
b. 30 to 60 miles
c. 60 to 90 miles
d. 90 to 120 miles
a
How many ports do recovery cylinders have?
a. one
b. two
c. three
d. four
b
We are protected from harmful _______ by the ozone.
a. infared radiation
b. ultraviolet radiation
c. both
b
Which of the following is formed if moisture is allowed to remain in an operating refrigeration system?
a. Hydrochloric acid
b. Hydrofluoric acid
c. Both options are correct
C
A person who gives details of interional venting of refrigerants to the atmosophere are privy to a reward of up to
a. $5,000
b. $10,000
c. $12,500
d. $15,000
b
What are some factors that affect the speed and efficiency of evacuation?
a. The size of the vacuum pump and suction line
b. The size of equipment being evacuated
c. The ambient temperature and amount of moisture in the system
d. All the options are correct
D
T/F Most refrigerant oils are not hygroscopic.
F
If they show signs of rust or appear to be insecure, they should be reduced to _______ and discarded.
a. 1 psig
b. 0 psig
c. negative psig
d. positive psig
b
Which of the following colors can easily identify approved refrigerant recovery cylinders?
a. Gray tops and yellow bodies
b. Yellow tops and blue bodies
c. Blue tops and yellow bodies
d. Yellow tops and gray bodies
d
Which of the following is formed when R-12 and R-22 decompose at high temperature?
a. Phosphene gas
b. Hydrochloric acid
c. Hydrofluoric acid
d. All the options are correct
d
What is the process which removes the refrigerant in any conditions from a system and stores it in an external container?
a. Recycle
b. Restore
c. Recover
d. Reclaim
c
Refillable refrigerant cylinders must not be filled to exceed ________ of its capacity by weight.
a. 75%
b. 80%
c. 90%
d. 95%
b
What is the name of the chemical which collides with an ozone molecule and releases its oxygen atom?
a. Chlorine peroxide
b. Chlorine dioxide
c. Chlorine pentoxide
d. Chlorine monoxide
d
T/F Recovery cylinders are used only with virgin refrigerant.
F
T/F Excessive pressure drops are a result of the use of long hoses.
T
Which agency must approve the refillable cylinders used for tansporting recovered pressurized refrigerants?
a. DOT
b. ARI
c. EPA
d. ASHRAE
a
How many oxygen atoms make up an ozone molecule?
a. One
b. Two
c. Three
d. Four
c
T/F To ensure that the refrigerant has been removed from appliances before scrapping is the responsibility of the final person in the disposal chain.
T
Which of the following is used when leak testing an R-134A system?
a. Pressurized nitrogen
b. Pressurized hydrogen
c. Pressurized air
d. All
a
Vacuum lines should be in what proportion to the pump intake connection?
a. Small than
b. Larger than
c. Equal to or small tham
d. Equal to or larger than
D
What percentage of ozone gas is contained over the earth’s surface in the stratospheric layer?
a. 10%
b. 25%
c. 90%
d. 99%
c
Asphyxia describes a lack of
a. Oxygen
b. Hydrogen
c. Nitrogen
d. Carbon dioxide
A
Since _______, it has been a violation, as per the EPA, to vent HFCs.
a. Nov 15, 1995
b. Nov 15, 1994
c. Jul 1, 1994
d. Jul 1, 1992
a
What kind of refrigerants will be used when virgin supplies of CFCs are depleted?
a. Reclaimed
b. Recovered
c. Recycled
d. All the options are correct
d
T/F There is an increase in ground level ozone when there is a depletion of ozone in the stratosophere.
T
What happens to the quality of emissions potentialized by long hoses?
a. Increase
b. Decrease
a
Which of the following devices is used in order to determine the general area of a leak?
a. Ultrasonic leak detector
b. Electronic leak detector
c. Both options are correct
c
T/F Esters are the oils used in most R-134a refrigeration systems.
T
T/F The piping connection to the vacuum pump should be as short a length as possible
T
T/F If nitrogen is used to flush the debris out of the system, it may not be legally vented after recovering the refrigerant.
F
T/F Refrigerants can displace oxygen and lead to suffocation (when displacingg large quantities)
T
T/F The system should be isolated when measuring a system’s vacuum.
T
How many ports do recovery cylinders have?
a. One vapor port alone
b. One liquid port alone
c. One liquid and one vapor port
C
T/F Chlorine added to the air by erupted volcanoescontributes to less pllution than CFCs because it dissolves with water and comes down with rain.
F
_________ in the upper stratosphere indicates that the ozone layer is being destroyed.
a. Chlorine monoxide
b. Chlorine pentoxide
c. Chlorine dioxide
d. Chlorine trioxide
a
T/F Explosion may occur when oxygen or compressed air are mixed with refrigerants.
T
T/F The same recovery tank must not contain differetn refrigerants.
T
