EPA Flashcards by Malachi Nokes

\_\_\_\_\_\_\_ has the highest ozone depletion potential (ODP)
a. HFC
b. CFC
C. HCFC
D. None

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By what year was the use of halons completely phased out?

a. 1987
b. 1989
c. 1994
d. 1995

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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

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Corrosion in refrigerent appliances results from a pH level that is

a. acidic
b. basic
c. either
d. none

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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

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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

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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

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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

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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

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T/F A vacuum test can detect a leak

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The refrigerant changes from high pressure vapor to a high pressure liquid during

a. expansion
b. condensation
c. compression
d. evaporation

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The refrigerant can be reclaimed if it meets the \_\_\_\_\_\_\_ purity standard
a. ARI-740
b. ARI-360
c. ARi-700
D. ARI-1024

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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

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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

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The refrigerant recovery cylinder must not exceed what percentage of its capacity?

a. 80%
b. 75%
c. 70%
d. 65%

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Refrigerated appliances are divided by the EPA into how many groups?

a. six
b. five
c. four
d. three

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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

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The _______ connects the evaporator to the compressor in a refrigerant system.

a. evaporation line
b. discharge line
c. suction line
d. liquid line

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In what state can the refrigerant be transferred or sold to another individual?

a. reclaimed
b. disosed
c. recycled
d. recovered

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A recovery cylinder can store up to how many refrigerants?

a. one
b. two
c. three
d. four

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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

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To which of the following refrigerant groups does R-134a belongs?

a. CFC
b. HFC
c. HCFC

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Under what EPA section are motor vehicle air conditioning (MVAC) service technicians governed?

a. 508
b. 509
c. 608
d. 609

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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

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T/F If there is a leak, a vacuum test allows air and moisture to enter the system.

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

What connects the condenser to the expansion device? a. discharge line b. suction line c. liquid line d. expansion line

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

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

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

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

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

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

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

Just upstream of the ________ inlet should be located this suction line filter drier. a. expansion valve b. compressor c. condenser d. evaporator

The diameter of the liquid line must be as _______ as possible to minimize the total refrigerant pressure drop. a. small b. large

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

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/F At the stratosphere, ozone is an unstable molecule.

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

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

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

CFC- 11 and CFC-12 ozone depleting substances contribute what percentage of stratospheric chlorine? a. 18% b. 51% c. 70% d. 82%

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

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

Flushing agents should be introduced into a refrigeration system through which of the following? a. compressor b. condenser lines c. evaporator d. condenser

What kind of refrigerant can be transferred to a new owner? a. recycled b. recovered c. renewed d. reclaimed

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

T/F The process of reclaimation and recyling of refrigerants are the same.

T/F CFCs are highly reactive in lower levels of the atmospher.

In what year was the Montreal Protocal signed? a. 1987 b. 1989 c. 1995 d. 1999

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

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

In very high pressure appliances, which of the following refrigerants is used? a. R-50 b. R-410a c. R-500 d. R-503

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

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

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

T/F Dehydration evacuation does not remove mineral oil or acid trapped in the oil.

Where in the refrigeration system is the refrigerant a warm liquid? a. expansion line b. suction line c. discharge line d. liquid line

Which device is located at the end of the liquid line? a. evaporator b. compressor c. expansion device d. condenser

What type of refrigerant is used with medium-pressure appliances? a. R-11 b. R-410a c. R-500 d. R-503

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

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

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

Why is oil used in the compressor? a. to seal the moving parts of the compressor b. to lubricate c. both

On what type of equipment are Schrader valves present? a. refrigerant systems b. recovery equipment c. both

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

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

Which refrigerant has the lowest ozone depletion potential? a. CFC-12 b. HCFC c. HFC d. all the options are correct

Which of the following refrigerants is compatible with disposable cylinders? a. recovery refrigerant b. virgin refrigerant c. both

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

T/F In a refrigeration system, the warmer the temperature the slower it will evacuate.

T/F All refrigerant oils are hygroscopic

What substance is obtained when ozone reacts with chlorine ion? a. oxygen b. HCI c. fluorine d. all options

T/F It may be impossible to reclaim mixed refrigerants in the same tank.

Which of the following will not cause an explosion when mixed with refrigerants? a. compressed hydrogen b. compressed air c. compressed nitrogen d. oxygen

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

T/F The only two mandatory recovery refrigerants are CFCs and HCFCs.

What percentage of the ozone layer is occupied by the stratosphere? a. 20% b. 50% c. 70% d. 90%

What is the color of the center port of the service manifold hose? a. red b. green c. blue d. yellow

What describes the weight of the smallest cylinder a 608-certified technician may purchase? a. 15lbs b. 20lbs c. 25lbs d. 50lbs

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

Which of the following does not belong to the group? a. reuse b. recycle c. reclaim d. recovery

Which of the following gases has the greatest capacity to determine a systems leak? a. nitrogen b. oxygen c. hydrogen d. carbon dioxide

What describes the process of cleaning the refrigerant for immediate use? a. decover b. reclaim c. recycle

What number mixture of refrigerants suits the ternary blend refrigerants? a. two b. three c. four d. five

In which of the following refrigeration cycles is the condensor present? a. high pressure side b. low pressure side

In which of the following appliances is R-134a refrigerant used? a. low pressure appliance b. medium pressure appliance c. high pressure appliance

What is measured by the compound gauge of the gauge manufold set? a. low pressure b. high pressure c. discharge pressure d. all options

About how many miles from the earth's surface does the stratosophere extend? a. 10 b. 30 c. 50 d. 70

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

In what phase are refrigerants in the suction line? a. low pressure vapor b. high pressure vapor c. warm liquid d. cold liquid

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

To which refrigerant group does R-22 belong? a. CFC b. HCFC c. HFC d. none of the above

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

When the refrigerant system is warmer than the cylinder, the refrigerant recovery rate will be a. faster b. slower c. independent d. unclear

Which leak detector audits possible gas leakage? a. fluorescent leak detector b. vacuum leak detector c. helium leak detector d. ultrasonic leak detector

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

What percentage of stratospheric chlorine comes from ozone depleting substance? a. 18% b. 51% c. 72% d. 82%

When was the Montreal Protocol substantially amended? a. 1992 b. 1994 c. 1998 d. 2000

Which one of the following is an HCFC regrigerant? a. r-11 b. r-22 c. r-113 d. r-410

When will the ban on the production or importing of any HCFC refrigerant take effect? a. 2017 b. 2018 c. 2020 d. 2024

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

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

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

T/F In the evacuation system, vacuum lines (hoses) should be equal to or larger than the pump intake connection.

T/F The most effective method for checking small leaks uses a halide torch.

T/F The refrigerant recovery rate will be ________ than the smaller the refrigerant system size. a. slower b. faster

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

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

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

Which of the following gas is used when checking for leaks in a system? a. Compressed air b. Oxygen c. Hydrogen d. Nitrogen

At rates of about __________ per year, the electronic leak detector cna detect leaks. a. 0.1oz b. 0.5oz c. 1 oz d. 10oz

In which part of the refrigeration cycle is the evaporator located? a. high pressure side b. low pressure side

Which of the following refrigerants does the Montreal Protocol agrements not phase out? a. HFCs b. HCFCs c. CFCs d. Halos

Before it can be sold, what standard must reclaimed refrigerants meet? a. ARI 500 b. ARI 700 c. ARI 740 d. ARI 1000

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

What is the state of nitrogen when it is used to pressurize the system? a. liquid b. gaseous c. either liquid or gaseous

What is the fastest method of dehydrating a system? a. Dual evacuation b. Triple evacuation c. Quadruple evacuation d. All options are correct

Which one of the following refrigerants contribute to global warming? a. CFC b. HCF c. HCFC d. All options are correct

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

What percentage of the earth's atmosphere does nitrogen constitute? a. 66% b. 75% c. 78% d. 80%

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

T/F The ozone depletion potential of CFCs is higher than HCFCs.

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

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

What is the temperature at which refrigerants begin to evaporate? a. bubble point b. saturation point c. dew point d. condensing point

``` What is the color of the high pressure gauge of a gauge manifold? a. Red b. Green c. Yellow D. Blue ```

Which of the following has the lowest malecular weight? a. Carbon dioxide b. Helium c. Oxygen d. Nitrogen

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

T/F The condenser rejects heat from the system

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

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

T/F HFCs are highly stable in lower parts of the atmosphere.

Refrigerant leaks depends mostly on a. viscosity b. specific heat c. compressibility d. molecular weight

A lack of which of the following may cause asphyxiation? a. Oxygen b. Hydrogen c. Air d. Carbon dioxide

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

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

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%

T/F Natural refrigerants such as carbon dioxide and hydro carbons (propane) have high Global Warming Potential (GWP) compared to HFCs.

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

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

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

Which of the following is the R-500 refrigerant? a. HCFCs b. HCFs c. CFCs

In pounds per square inch, what is the pressure of the atmosophere? a. 1.47 b. 14.7 c. 147 d. 1470

According to Clean Air Act (CAA), R-22 must be a. Destroyed b. Recovered and Recycled c. Reclaimed d. All the options are correct

Natural sources such as volcano eruptions contribute to what percentage of stratospheric chlorine? a. 18% b. 30% c. 35% d. 40%

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

The reaction of refrigerants with water is a. Electrolysis b. Hydrolysis c. Aquesistion d. Distillation

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

In which of the following configurations will relief valves in the refrigeration system be? a. Parallel b. Series c. Either series or parallel

T/F HFC refrigerants have Zero Ozone Depletion Potential and Zero Global Warming potential.

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

What letter represents the refrigerant with a higher toxicity? a. A b. B c. C d. D

What is thecolor of the compound gauge that measures low pressure and vacuum? a. Red b. Yellow c. Green d. Blue

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

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

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

Class I Refrigerants will have an ozone depletion potential greater than a. 0.2 b. 0.8 c. 1 d. 2

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

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

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

T/F Recovery cylinders are designed to be refilled.

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

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

Which of the following is an example of an HFC? a. R-22 b. R-123 c. R-134a d. R-500

Before it can be resold, what standard must a reclaimed refrigerant meet? a. ARI 700 b. ARI 1000 c. ASHRAE 1000 d. ASHRAE 700

``` 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 ```

What happens to the recovery process of the refrigerants when the ambient temperature becomes colder? a. Shorter b. Temperature has no effect c. Longer

T/F Before opening a system for service, CFCs and HCFCs must be recovered.

T/F REfrigerant oil must be miscible at high temperature.

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

Which of the following is not a result of stratospheric ozone depletion? a. Reduced marine life b. Skin cancer c. Crop loss d. Reforestation

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

On what date were CFCs phased out? a. Jan 1, 1995 b. Dec 31, 1996 c. Jan 1, 1996 d. Dec 31, 1995

T/ F Ozone at ground level is considered to be undersirable and a pollutant.

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

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

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

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.

In which region or area is stratospheric ozone depletion a series problem? a. Global b. Asia c. Antartica d. North America

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

T/F Recovery cylinders are not specifically designed.

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

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

When was the Montreal Protocol enacted? a. 1988 b. 1989 c. 1991 d. 1992

What quality of ozone depletion potential belongs to R-134a? a. Zero b. Low c. High d. Unity

T/F The temperature of the earth is stably maintained in part by the ozone.

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

T/F Hygroscopic oil has a high affinity for water.

What happens to the speed of the recovery when the ambient temperature is lower? a. slower b. faster

T/F A recovery cylinder can fit and recover a maximum of three types of refrigerants.

During evacuation, a heated refrigeration system will result in a ______ dehydration time. a. Increased b. Decreased c. No effect

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

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

Every _________ years, refillable cylinders must be hydristatically tested and date stamped. a. 1.5 b. 2 c. 3a d. 5

On which of the following arrangements must relief valves be installed? a. Series b. Parallel c. Either series or parallel

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

Which device is used to pinpoint leaks in the refrigeration systems? a. Electronic leak detector b. Ultrasonic leak detector c. Soup bubbles

T/F Most refrigerant oils will mix with R-134A.

T/F There is no temoerature glide in an azeotrope mixture

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

Refrigerants are _________ than air. a. lighter b. heavier

heavier

T/F Refrigeration cylinders should not be transported in an upright position.

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

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

How many ports do recovery cylinders have? a. one b. two c. three d. four

We are protected from harmful _______ by the ozone. a. infared radiation b. ultraviolet radiation c. both

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

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

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

T/F Most refrigerant oils are not hygroscopic.

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

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

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

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

Refillable refrigerant cylinders must not be filled to exceed ________ of its capacity by weight. a. 75% b. 80% c. 90% d. 95%

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

T/F Recovery cylinders are used only with virgin refrigerant.

T/F Excessive pressure drops are a result of the use of long hoses.

Which agency must approve the refillable cylinders used for tansporting recovered pressurized refrigerants? a. DOT b. ARI c. EPA d. ASHRAE

How many oxygen atoms make up an ozone molecule? a. One b. Two c. Three d. Four

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.

Which of the following is used when leak testing an R-134A system? a. Pressurized nitrogen b. Pressurized hydrogen c. Pressurized air d. All

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

What percentage of ozone gas is contained over the earth's surface in the stratospheric layer? a. 10% b. 25% c. 90% d. 99%

Asphyxia describes a lack of a. Oxygen b. Hydrogen c. Nitrogen d. Carbon dioxide

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

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

T/F There is an increase in ground level ozone when there is a depletion of ozone in the stratosophere.

What happens to the quality of emissions potentialized by long hoses? a. Increase b. Decrease

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

T/F Esters are the oils used in most R-134a refrigeration systems.

T/F The piping connection to the vacuum pump should be as short a length as possible

T/F If nitrogen is used to flush the debris out of the system, it may not be legally vented after recovering the refrigerant.

T/F Refrigerants can displace oxygen and lead to suffocation (when displacingg large quantities)

T/F The system should be isolated when measuring a system's vacuum.

How many ports do recovery cylinders have? a. One vapor port alone b. One liquid port alone c. One liquid and one vapor port

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.

_________ in the upper stratosphere indicates that the ozone layer is being destroyed. a. Chlorine monoxide b. Chlorine pentoxide c. Chlorine dioxide d. Chlorine trioxide

T/F Explosion may occur when oxygen or compressed air are mixed with refrigerants.

T/F The same recovery tank must not contain differetn refrigerants.

Which of the following cylinders are used only with a refrigerant? a. Disposable b. Recovery c. Either disposable or recovery d. Neither disposable nor recovery

T/F During recovery, refrigerant cylinders may be heated with an open flame during recovery.

T/F The diameter of the piping connection to the vacuum pump should be as large as possible.

T/F The vacuum pump should be connected as far as possible from the system vacuum gauge.

Appliances with 15 pounds or less of refrigerant use what kind of recovery equipment? a. System dependent b. Self contained

What is the process that ensures the reuse of refrigerants by separting the oil from the refrigerant and removing moisture from the refrigerant by passing it through one or more filter dries? a. Recycle b. Restore c. Reclaim d. Recover

T/F The prohibition of venting of refrigerants was ensured by The Clean Air Act.

What is one possible result of the inhalation of refrigerant vapors or mist? a. Oxygen deprivation b. Heart irregularities c. Unconsciousness d. All the options are correct

On a daily basis, it is important to check all refrigerant equipment for ______. a. Refrigerant leaks b. Oil levels c. Both oil levels and refrigerant leaks

What percentage of the refrigerant must recovery equipment manufactured before November 15, 1993 be capable of recovering? a. 60% b. 70% c. 80% d. 90%

Which of the following refrigerants can be mixed in the recovery cylinders? a. R410a, R-22 and R11 b. R410a and R-22 c. R410a and R-11 d. Refrigerants should not be mixed

For which of the following processes msut all appliances have a service aperture valve? a. Recovering refrigerants b. Charging refrigerants c. Both for recovering and charging refrigerants

What kind of certification must be prosseessed by technicians who handle refrigerants during service, maintenance, or repair of small appliances? a. Universal certification b. Type 1 c. Type 1 or universal certification

T/F MVAC or motorized vehicle air conditioning systems fall under the small appliance regulations.

What are temperature/pressure charts used for? a. Compressing ability of refrigerant b. Specific heat of air c. Identifying the refrigerant d. All the options are correct

What must be known if refrerences to the pressure/tempature chart for determining the type of refrigerant are to be valid? a. Volume of cylinder b. Pressure c. Temperature

Which of the following rrefrigerants can be purchased not only by technicians? a. HFC b. CFC c. HCFC d. All the refrigerants are restricted

What kind of recovery equipment uses its own power to recover the refrigerant from systems? a. Active recovery equipment b. Passive recovery equipment c. Both active and passive recovery equipment

All refrigerant recovery equipment should be checked for ________ on a daily basis. a. Refrigerant leaks b. Both oil level and refrigerant leak c. Oil level

A small appliance, as defined by the EPA, is fully manufactured, charged, and hermetically sealed in a factory, a product with ________ or less of refrigerant. a. 2 lbs b. 5 lbs c. 10 lbs d. 15 lbs

What is the name of the recovery process that captures a refrigerant into a nonpressurized container? a. Active recovery process b. Passive recovery process c. Both active and passive recovery process

Which of the following describes the thermodynamic cooling process for refrigerators, if the refrigerant is ammonia or sulfur dioxide? a. Vapor compression b. Heat - driven absorption c. Both options are correct

Which of the following detrmines the type of refrigerant? a. ARI 700 purity test b. ARI 740 purity testARI 700 purity test c. ARI 1000 purity test d. ARI 1100 purity test

T/F Higher discharge pressure in a self-contained recovery device is a result of not opening the tank inlet valve or having excess air.

What can be checked inside the recovery tank in order to view air or noncondensables? a. Pressure b. Density c. Temperature d. Compressing capacity

Appliances containing _________ or less of refrigerant can be used in system-dependent recovery. a. 3 lbs b. 5 lbs c. 15 lbs d. 20 lbs

What kind of stub is attached to the filter drier in a refrigeration sytem? a. High side pressure b. Low side pressure

T/F Vacuum pumps or recovery machines should not be used on equipment that contains hydrogen.

What percentage of the refrigerant should be able to be recovered by recoovery equipment manufactured after November 15, 1993, even without the compressor operating? a. 60% b. 70% c. 80% d. 90%

T/F Components of refrigerants such as hydrogen and water are required to be recovered, according to EPA reguations.

The refrigerant will recover faster with which of the following recover devices? a. Active recovery devices b. Passive recovery devices c. Recovery rate is independent of active and passive recovery device used

T/F A pressurized container that captures the refrigerant must be used in a system dependent recovery process.

The technician may use which of the following for small appliances? a. A self contained recovery device b. A system dependent recovery system c. Either a self contained recovery device or a system dependent recovery system

Only a single piercing access valve needs to be installed in which of the following recovery systems? a. Systems dependent recovery units b. Self contained recovery units

T/F To charge a system accurately with refrigerant, a graduated charging cylinder is used.

As per EPA regulations, it is not necessary to recover which of the following refrigerants? a. Methyl chloride b. Ammonia c. Sulfur dioxide d. All the options are correct

The EPA approves which of the following refrigerants being recovered by EPA approved devices? a. Methyl chloride b. Ammonia c. Hydrogen d. None of the options are correct

Only appliances with _______ or less of refrigerants can be recovered by system - dependent recovery equipment. a. 10 lbs b. 15 lbs c. 20 lbs d. 25 lbs

Trapped liquid refrigerant is vaporized, and the recovery process is sped up by which of the following, found in domestic refrigeration systems? a. Compressor b. Condensor c. Evaporator d. Defrost heater

Overheating is not a risk to the system compressor in which of the following recovery units? a. Self contained recovery units b. System dependent recovery units

T/F In order to recover the refrigerant from the system, a self-contained recovery equipment uses its own power.

T/F One does not need to have any certified recovery equipment if the HVAC technician holds a type I certification.

All air conditioning and refrigeration equipment containing more than _________ of refrigerant and manugactured after Noverber 15, 1993 (according to EPA regulations) require tha it be provided with a servicing aperture to facilitate removal of the refrigerant when the unit is serviced or disposed off. a. 1 lb b. 3 lb c. 5 lb d. 15 lb

To aviod burning out the compressor, do not operate the system compressor with a suction side pressure below a. 0 HG b. 2 HG c. 4 HG d. 5 HG

Which of the following purity tests determines the type of refrigerant? a. ARI 700 b. ARI 1000 c. ARI 1200 d. ARI 1400

Whether or not the compressor is operating or achieving a 4 inch vacuum under conditions of ARI 740, recovery equipment manufacted after Nov 15, 1993 shall be able to recover the refrigerant by _____-. a. 75% b. 80% c. 90% d. 95%

The recovery vessel must be ______ in order to recover the maximum mass of the refrigerant from the refrigeration system. a. Cooled b. Heated

Checking for noncondensables or air can be doen by checking for _______ inside the recovery tank. a. Volume b. Pressure c. Temperature d. Density

Only one service connection is required by which of the following? a. Self contained recovery units b. System dependent recovery units c. Both recovery units have two service connections

T/F A nonpressurized container to capture the refrigerant must be used in a system dependent recovery process.

T/F Certified technicians are the only ones permitted to purchase CFCs and HCFCs.

T/F The compressor will burn out if too deep a vacuum is drawn by the system compressor.

The system has a leak, and all the refrigerant must be leaked out if the system pressure is _______ psig. a. Positive b. Negative c. 0

T/F When using a self contained (active) recovery machine, never operate the system compressor.

On a _______ basis, all refrigerant recovery equipment should be checked for oil level and refrigerant leaks. a. Daily b. Weekly c. Monthly d. Annual

In new household refrigerators, what is the most commonlu used replacement for refrigerant 134a a. R12 b. R22 c. R123 d. R500a

Refrigerant is recovered faster from the system using which of the following recovery units? a. System dependent recovery units b. Self contained recovery units

Under the conditions of ARI 740-1993, self contained recovery equipment (to be used for small appliances) must be able to evacuate the small appliance to ________ vacuum. a. -4 Hg b. 0 Hg c. 2 Hg d. 4 Hg

T/F At the bottom of the cylinder, graduated charging cylinders have a pressure gauge.

T/F When preparing refrigerants from small appliances, certified technicians are authorized to enact removal.

T/F It is possible to use charging cylinders to transport the refrigerant.

What is a consequence of a refrigerant facility that receives a tank of mixed refrigerants? a. Refuse to process the refrigerant and return back b. Destroy the refrigerant with a substantail fee c. Both options are coorect

T/F A gray body with a yelllow top is associated with recovery cylinders.

One must be certified with _______ in order to handle refrigerants during maintenance, service, or repair of small appliances. a. Type 1 technicaian b. Unversal technicain c. Either type 1 technician or universal technician

T/F Refrigerant in a pressurized recovery tank cannot be stored using self-contained recovery equipment.

T/F Nitrogen may legally vented after recovering the refrigerant if it was used to flush the debris out of the system.

Appliances containing _______ of refrigerant or less can be used with system- dependent devices. a. 10lbs b. 15lbs c. 20 lbs d. 25 lbs

T/F Refrigerants must be not mixeed in a recovery tank.

With the assistance of the appliance compressor, an ecternal heat source, or a vacuum pump, what kind of recovery equipment captures the refrigerant? a. Self contained recovery unit b. System dependent c. Both options are correct

Do not begin the recovery process it you find that, after installing an access fitiing, the system pressure is ________. a. Negative psig b. Positive psig c. psig

It is the responsibilty of the __________ to comply with any future changes if the EPA regulations change after a technician becomes certified. a. EPA b. Technician c. Both the EPA and the technician

T/F There is no EPA requirement to repair leaks for small appliances.

In a refrigeration system, air will cause ________ discharge pressures. a. Negative psig b. None c. Higher d. Lower

Products manufactured, charged, and hermetically sealed in a factory with __________ of refrigerant or less describes the EPA definition of a small applainces. a. 5 lbs b. 10 lbs c. 15 lbs d. 20 lbs

T/F Utilizing system dependent recovery equipment can achiveve desired evacuation rates in appliances with nonoperating compressors.

A nonpressurized container to capture the refrigerant must be used in a ________ recovery process. a. Self contained b. System dependent

One is able to select the proper ________ approved refrigerant recovery cylinder for the refrigerant after the type of refrigerant has been identifeied. a. EPA b. ARI c. DOT d. ASHRAE

What will happen to the recovery process if one is to operate the defrost heater? a. Speed b. Delay

The small appliance should be evacuated to ______- of the mercury vacuum. a. 0 inches b. 2 inches c. 4 inches d. 8 inches

Which agency requires technicians to have at least one self contained recovery devices available at the shop to recover the refrigerant from systems with nonoperating compressors? a. ARI b. EPA c. DOT d. ASHRAE

T/F Current EPA recovery devices should be used to recover refrigerants such as methyl formate, methyl chloride, or sulfer dioxide.

What should a reclamation facility do when receiving a tank of mixed refrigerants? a. May agree to destroy the refrigerant but charge substantial fee b. Return it at the owners expense c. They may refuse to process the refrigerant d. All options are correct

T/F It is necessary to know the type of refrigerant that is in the system before beginning a refrigerant recovery procedure.

Which of the following purity test to determine the type of refrigerant? a. ARI 700 b. ARI 740 c. ARI 1000 d. ARI 1200

T/F The sale of CFCs and HCFCs is restricted to certified technicians.

To verify the refrigerant, which of the following characteristics of the refrigerant or the nameplate is used? a. Pressure/volume b. Pressure/temperature c. Volume/temperature d. Pressure/volume

The DOT specifies that recovery cylinders have a. Gray bodies with yellow tops b. Yellow bodies with gray tops c. Yellow bodies with blue tops d. Blue bodies with yellow tops

T/F Compared to the system dependent recovery devices, self contained active recovery devices will recover the refrigerant faster.

T/F Access to both the low and high sides of the system may be necessary for recovery, if the appliance has an operating compressor.

T/F Larger appliances with more than 15 lbs of charge, such as a centrifugal air conditioner, are incompatible with system dependent recovery devices.

T/F Only the last person in the disposal chain can recover the refrigerant.

T/F If you are returing the refrigerant directly to the system after servicing, graduated recharging cylinders cannot be used.

T/F As per DOT regulations, refrigrants can be transported in a charging cylinder.

All air conditioning and refrigerantion equipment containing more than_________ of the refrigerant and manufactured after November 15, 1993, as per EPA regulations, be provided with a servicing aperture to facilitate removal of the refrigerant when the unit is serviced or disposed off. a. 1lbs b. 5 lbs c. 10 lbs d. 15 lbs

T/F An upright position is an appropraite way to transport refrigerant cylinders.

When the compressor of the system is operating, a system dependent pprocess refrigerant shall be reovered to _______. a. 75% b. 80% c. 85% d. 90%

T/F Equipment that contains hydrogen should be used independently of vacuum pumps or recovery machines.

Under the conditions of ________ self contained recovery equipment (to be used for small appliances) must be able to evacuate the small appliance to 4'' Hg vacuum. a. ARI 700 b. ARI 740 c. ARI 1000 d. ARI 1200

T/F The recovery process will be sped up by operating thr defrost heater.

If the compressor is not operating as per the ARI 740 requiements, the recovery equipment manufactured after November 15, 1993 must be able to recover ________ of the refrigerant. a. 80% b. 90% c. 95% d. 100%

A _______ burnout has likely occurred if a strong odor has been detected during the recovery process. a. Accumulator b. Expansion device c. Condenser d. Compressor

Run the compressor and recover from the _______ of the system when using a system dependent recovery process on an appliance with an operating compressor. a. Low side b. High side c. Either low or high side

T/F Higher discharge pressure are caused by air in the refrigeration system.

After what date it becomes madated that recovery equipment certified by an EPA- approved testing laboratory shall be capable of recovering 90% of the refrigerant if the compressor is operating? a. Nov 15, 1993 b. Nov 15, 1994 c. Nov 15, 1995 d. Nov 15, 1996

T/F Refrigerants removed from appliances can be enacted through self contained recovery equipment.

_______ fo refrigerant or less describes the EPA protocol weight for a small appliance including products manufactred, charged, and hermetically sealed in a factory. a. 3 lbs b. 5 lbs c. 10 lbs d. 15 lbs

How many inches ove mercury vacuum must small appliances be evacuated to? a. 0.5 inches b. 1 inches c. 2 inches d. 4 inches

T/F Make sure that the tank inlet valve is closed before operating a self-contained recovery machine.

Only with a stable known ________ can one accurately read refrigerant pressure. a. temperature b. volume c. density d. all the options are correct

What is the name of the device at the top of the graduated charging cylinders? a. Humidity meter b. Pressure gauge c. Density gauge d. All the options are correct

T/F Refrigerants will be recovered faster using self-contained active recovery devices.

T/F Only a relatively large amount of refrigerant can be held in graduated charging cylinders.

T/F The respondibility to ensure that refrigerants have been properly recovered is shared by everyone in the disposal chain.

T/F A charging cylinder should never hold a refrigerant for transport.

T/F Recovery equipment should not be used to recover refrigerants such as ammonia, hydrogen, or water.

Cylinders have to meet ____ standards before shipping any used refrigerant cylinders. a. EPA b. DOT c. ASHRAE d. ARI

All air conditioning and refrigeration equipment containing more than ________ of refrigerant and manufactured after November 15, 1993, as per the EPA regulations, be provided with a servicing aperture to facilitate removal of the refrigerant when the unit is serviced or disposed off. a. 1 lb b. 3 lbs c. 5 lbs d. 15 lbs

T/F The system compressor is under risk of overheating in a self - contained recovery unit.

Appliances with _____ or less of refrigerant are compatible with system dependent recovery equipment. a. 5 lbs b. 15 lbs c. 20 lbs d. 25 lbs

Recovery is possible when the appliance has a leak, in the case of _______, a. System dependent recovery unit b. Self contained recovery unit c. Either option is correct

There is a risk of explosion if _________ is vented in an enclosed space. a. Nitrogen b. Oxygen c. Carbon dioxide d. Hydrogen

Under the conditions of __________, self contained recovery equipment must be able to evacuate the small appliance to 4'' Hg vacuum. a. ARI 700 b. ARI 740 c. ARi 1000 d. ARI 1200

T/F Nitrogen may be legally vented after recovering the refrigerant, if nitrogen is used to flush the debris out of the system.

What kind of purity test should be carried out in order to determine the specific type of refrigerant? a. ARI 700 b. ARI 740 c. ARi 1000 d. ARI 1200

If a reclamation facility receives a tank of mixed refrigerant then they a. Refuse to process the refrigerant b. Destroy the refrigerant, but typically, a substantial fee is charged c. Return it at the owner's expense d. All the options are correct

T/F Refrigerants should be transported in a charging cylinder.

T/F Only a certified refrigerant reclamation facility may separate refrigerants.

T/F Anyone along the disposal chain can recover the refrigerant, according to EPA regulations.

Recover ________ of refrigerants into small appliances when using recycling and recovery equipment manufactured before November 15, 1993. a. 80% b. 85% c. 90% d. 100%

Access to _____ of the system many be necessary if an appliance has a nonoperating compressor. a. Low side b. High side c. Both low and high side

T/F There is no need to have any certified recovery equipment if a technician holds a type I certification.

According to EPA, a small appliance contains _______ or less of refrigerant. a. 3 lbs b. 5 lbs c. 10 lbs d. 15 lbs

In which of the following phases do recovery units remove the refrigerant? a. Liquid b. Vapor c. Either as a liquid or vapor

T/F The low side of the system does not contain the liquid receiver.

What is the state of a refrigerant leaving the liquid receiver of a refrigeration system? a. High pressure liquid b. Low pressure liquid c. High pressure gas d. Low pressure gas

T/F When the system is under a deep vacuum, a hermetic compressor can be operated.

T/F A filter drier shall be always replaced when servicing an open refrigeration system.

All recovery cylinders are _______ rated. a. Volume b. Pressure c. Temperature d. Density

What is the weight limit ( in ton of Cooling capacity) of typical AC compressors? a. 5 b. 10 c. 15 d. 20

The charge is probably ________ if the refrigerant is seen at liquid line and the sight glass contains bubbles. a. Zero b. Low c. High d. Normal

The vacuum pump must pull a minimum of _______ when evacuating a system. a. 50 microns b. 500 microns c. 5000 microns d. 50,000 microns

Which of the following indicates a high-pressure system that has a leak? a. Oil traces only b. High superheat only c. Both options are correct

Which of the following affects the amount of refrigerant that is absorbed in the oil? a. Temperature alone b. Pressure alone c. Both pressure and temperature

Since what date has the sale of CFC and HCFC refrigerants been restricted to certified technicians? a. Dec 31, 1994 b. Nov 14, 1994 c. Jan 1, 1995 d. Jan 1, 2005

As defined by ASHRAE, the sensor and alarm required for A1 (R-12, R-22) refrigerants senses ______. a. Nitrogen depletion b. Hydrogen depletion c. Oxygen depletion d. Carbon dioxide depletion

The recovery process will go ________ if you can warm the system. a. Faster b. Slower c. Remains the same

Which of the following is indicated to be upstream when there is moisture on the sight glass? a. Condenser b. Expansion valve c. Compressor d. Filter drier

What is often contained in refrigerants build before 1950? a. C12 b. NO2 c. HNO3 d. SO2

Which of the following is not most often used as a hermetic compressor? a. Centrifuglal compressor b. Scroll compressor c. Reciprocating compressor d. Rotary compressor

When the annual leak rate of a comfort cooling system with more than 50 lbs of refrigerant exceeds _________, the EPA requires it be repaired. a. 10% b. 15 % c. 20% d. 25%

If the sight glass is covered with ice, which of the following is used to remove the ice? a. Forced air b. Nitrogen c. Alcohol spray d. Carbon dioxide

T/F The amound of refrigerant in the lubricating oil is reduced by heating the oil?

How many inches of vacuum must recovery or recycling equipment achieve from a high-pressure appliance (R-13, R-23, R-503) if that recovery or recycling equipment was manufactured before Nov 15,1993? a. 0 b. 4 c. 10 d. 15

T/F To carry out pressure tests in a refrigeration system, trace amounts of R-22 can be used.

In a refrigeration system, in the case of moisture indicating sight galss, the moisture would be located ________ of the filter drier. a. Downstream b. Upstream

In order to remove the ice formation on the liquid line sight glass, which of the following is sprayed? a. Liquid nitrogen b. Liquid CO2 c. Water d. Alcohol

T/F The low side of the refrigeration system contains the liquid receiver.

How must the cylinder be treated before transferring the refrigerant into an empty refrigerant cylinder? a. Cleaned with ammonia b. Evacuated c. Cleaned with alcohol d. Cleaned with acidic solution

Once the refrigerant passes through the ______, the high pressure can be dropped back to low pressure. a. Expansion valve b. Evaporator c. Compressor d. Condenser

Upstream of which of the following is mositure indicating sight glass located? a. Condenser b. Expansion valve c. Compressor d. Filter drier

What is installed in order to prevent any transient slugs of liquid from entering the compressor? a. Filter drier b. Crank case c. Accumulator d. Recovery equipment

The applicane can be evacuated to _____ if a leak in an appliance makes the prescribed evacuation level inattainable. a. Less than 0 psig b. More than 0 psig c. 0 psig

Which of the following preset valves does TXV attempt to maintain? a. Evaporator exit superheat b. Evaporator inlet superheat c. Condenser exit subcooling temperature d. Condenser inlet subcooling temperature

``` Which of the following is correct if the refrigerant seen at liquid line sight glass is discolored? A. Acid fomation b. Charge is low c. Charge is high d. Impurities ```

Which of the following is removed by filter drier? a. Moisture only b. Particulates only c. Both options are correct

The discharge of the ________ of a refrigeration system is upstream of the liquid receiver system. a. Condenser b. Compressor c. Evaporator d. Expansion device

T/F The refrigerant leaves the condenser as a slightly subcooled liquid or as a saturate liquid.

Which of the following does the liquid line sight glass check? a. Refrigerant charge only b. Refrigerant moisture content c. Both options are correct

If recovery of the recycling equipment was manufactured on or after November 15, 1993, how many inches of vacuum must recovery or recycling equipmetn achieve in high pressure appliances normally containing less than 200 pounds of refrigerant? a. 0 b. 4 c. 10 d. 15

Up to how many years is an EPA Section 608 Certification valid? a. 1 year b. 2 years c. 5 years d. No expiry

What is installed in order to prevent any transient slugs of liquid from entering the compressor? a. Accumulator b. Expansion tank c. Filter drier d. Liquid collector

In large refrigeration systems, which of the following is used? a. Centrifugal compressors b. Screw compressor c. Both centrifugal and screw compressors

Up to about what tonnage capacity are hermetic scroll compressors widely used in split residential AC systems? a. 10 tons b. 15 tons c. 20 tons d. 25 tons

What will be the quality of pressure of a refigerant leaving the liquid receiver of a refrigeration system? a. High pressure liquid b. High pressure gas c. Low pressure gas d. Low pressure liquid

T/F The liquid reciever is part of the low side of the refrigeration system.

T/F The liquid receiver is located downstream of the condenser in a refrigeration system.

The pressure relief valves must be installed in the valves in ________ if the system requires more than one pressure relief valve. a. Series b. Parallel c. Either series or parallel

Multiple compressors shall be connected in _______ in order to achieve the required capacity when a large enough compressor is not available. a. Series b. Parallel c. Either series or parallel

The _____ moisture the air can hold, the higher the temperature. a. More b. Less c. Temperature is independent of moisture content holding capacity.

When the appliance contains less than _______ of refrigerant, system dependent recovery equipment can be used. a. 15 lbs b. 20 lbs c. 25 lbs d. 30 lbs

The recovery is ________ when the pressure in the system is reduced. a. Faster b. Slower c. Independent

T/F The amount of refrigerant in the lubricating oil is reduced by heating the oil.

Under which of the following conditions will hermetic compressor motor windings heat up most? a. Full load b. Light load c. Deep vacuum d. None of the options are correct

What kind of refrigerant is a compressor unable to compress? a. Vapor b. Liquid c. Both

At saturation pressure, what is the actual refrigerant vapor temperature and saturation temperature? a. Subcooled b. Supercooled c. Subheat d. Superheat

In a refrigeration system, which of the following is used to break the vacuum? a. Air b. Carbon dioxide gas c. Dry nitrogen gas d. Oxygen

In what phase will the recovering refrigerant fail to remove oil from the system? a. Liquid b. Vapor c. Neither

At about what rate, per year, are electronic leak detectors capable of detecting leaks? a. 0.5 oz b. 1 oz c. 1.5 oz d. 2 oz

Through which device does a refrigerant pass to change from a high pressure liquid to a low pressure one? a. Compressor b. Condenser c. Expansion valve

In what state does the refrigerant leave the condenser? a. Saturate liquid b. Slightly subcooled liquid c. Both

T/F The recovery tank pressure is faster when the recovery tank temperature is lower.

_______ of the discharge of the compressor, the liquid receiver is present. a. Downstream b. Upstream

On dehydrates a refrigeration system in order to remove _______. a. Water or water vapor b. Oils in the refrigerant c. Gases in the refrigerant d. Acids in the refrigerant

T/F The amount of refrigerant lost over the last 12 months as a percentage of the total charge is the basis for knowing the leak rate.

The density of the refrigerant _______ as the system is evacuated. a. Drops b. Increases c. Density remains the same

Which of the following systems offers a faster way to charge? a. Vapor b. Liquid c. Both will take the same time

Within how many days must a substantial leak in all comfort cooling appliances that contian more than 50 pounds of refrigerant be repaired? a. 10 b. 15 c. 30 d. 45

The system pressure is ______ than atmospheric pressure of a refrigeration system has been evacuated. a. Lower b. Higher c. Equal

A nonazeotropic refrigerant blend can charge as a _____ when charging into a system. a. Liquid b. Vapor c. Both

What shall be done if there is a large release of refrigerant in a contained area? a. Use a SCBA apparatus b. Leave the area immediately c. Both options are correct

______ requires that a specific refrigerant sensor be installed to detect the toxic refrigerant if the system is charged with any other toxic refrigerant. a. ASHRAE Standard 10 b. ASHRAE Standard 15 c. ASHRAE Standard 20 d. ASHRAE Standard 25

A pressure decay test using dry ______ is the best leak checking procedure. a. Air b. Nitrogen c. Oxygen d. Hydrogen

T/F A refrigerant trace gas needs to be added to nitrogen when an ultrasonic leak detector is used for detecting the refrigerant leaks.

Which of the following purity tests is carried out in order to determine the refrigerant quality? a. ARI 600 b. ARI 700 c. ARI 1000 d. ARI 1200

If a QwickCheck acid test shows no sign of ______, the recovery refrigerant can be charged back into the system. a. Hydrogen b. Moisture c. Acid d. Sulphur dioxide or nitrous traces

At what side of the refrigeration system is the liquid receiver prensent? a. High b. Low

The ______ the system pressure, the warmer the refrigeration sytem. a. Higher b. Lower

Up to about what tonnage capacity are hermetic scroll compressors widley used in split residential AC systems? a. 5 tons b. 6 tons c. 10 tons d. 15 tons

When the temperature goes _______, oil absorbs more refrigerant. a. Down b. Up

The filter drier is designed to ________ from the refrigerant. a. Emove water b. Trap acid c. Both options are correct

If the sight glass is covered with ice which hinders the visibility of the refrigerant in the refrigeration system, which of the following is used? a. Dry nitrogen b. Forced dry air c. Ammonia spray d. Alcohol spray

All comfort cooling system with more than 50 lbs of refrigerant, as per EPA requirment, must be required when the annual leak rate exceeds _______. a. 10% b. 15% c. 20% d. 25%

If recycling equipment was manufactured before 11/15/93 ______ inches of vacuum that recovery or recycling equipment must achieve for appliances except for small appliances, motor vehicle AC, and motor-vehicle like appliances revised by the EPA March 12,2004. a. 0 b. 4 c. 10 d. 15

In which of the following phases will recovery of the refrigerant from refrigeration system take more time? a. Liquid b. Vapor

T/F The refrigerant has to be recovered to below atmospheric pressure if the sytem has a leak.

Since what date hs the sale of CFC and HCFC refrigerants been restricted to certified technicians? a. Nov 14, 1993 b. Nov 15, 1993 c. Nov 15, 1994 d. Nov 14, 1994

The recovery is _____ when the pressure in the system is reduced. a. Faster b. Lower

T/F EPA type II technicians are certified to service small appliances.

Downstream of which of the following devices is the liquid receiver in a refrigeration system located? a. Condenser b. Evaporator c. Compressor d. Expansion device

When the appliance contains more than _______ of the refrigerant, system dependent recovery equipment cannot be used. a. 15 lbs b. 20 lbs c. 25 lbs d. 30 lbs

The recovery process will be ______ when the ambient temperature is low. a. Slow b. Fast c. Remain the same

Check the recovery or recycling unit for leaks every ______ months or as required by the manufacturer of the refrigeration unit. a. 1 b. 3 c. 9 d. 12

A sensor and alarm are requied for A-1 refrigerants to sense _______ depletion, as per the ASHRAE standard 15. a. Nitrogen b. Hydrogen c. Carbon dioxide d. Oxygen

It is required that the vacuum pump pull a minimum of ____ when evacuating a system. a. 100 microns b. 200 microns c. 400 microns d. 500 microns

The appliance can be evacuated to _______ if a leak in the appliance makes the prescribed evacuation level unattainable. a. 0 psig b. 1 psig c. 14.3 psig d. 14.7 psig

When the annual leak rate exceeds _______, the EPA requires that all commercial, industrial, and commercial process refrigeration system with more than 50lbs of refrigerant be required. a. 15% b. 20% c. 25% d. 35%

TXV or an electronic expansion valve (EXV) attempts to maintain a preset at which of the following? a. Expansion device inlet superheat b. COndenser exit superheat c. Evaporator exit superheat d. Conderser entrance superheat

Before the refrigerant enters the condenser it leaves the compressor as which of the following? a. High pressure vapor b. High pressure liquid c. Low pressure liquid d. Low pressue vapor

The incoming refrigerant is plumbed directly to the compressor inlet, and the dicharge refrigerant is used to cool the motor windings before leaving the compressor in which of the following types of compressor? a. Centrifugal compressor b. Scroll compressor c. Screw compressor d. Rotary compressor

T/F The refrigerant recovery can be assisted by the crankcase heater.

What is the purpose of oil in the compressor? a. Lubricating agent b. Sealing agent c. Both options are correct

T/F Trapped water may freeze through the use of a large vacuum pump.

What will happen to discharge through the action of noncondensables present in the refrigerant? a. Increase b. Decrease

T/F Before transferring refrigerants to the cylinder, technicians should always evacuate an empty recovery cylinder.

If an appliance contains more than ________ of refrigerant, system dependant recovery equipment cannot be used. a. 15 lbs b. 20 lbs c. 25 lbs d. 30 lbs

A ________ burnout may have occurred of one detects a strong odor during the recovery process. a. Compressor b. Condenser c. Evaporator d. Expansion device

EPA regulations require that all comfort cooling appliances containing more than 50 lbs of refrigerant must be required when the annual leak rate exceeds _________. a. 15% b. 20% c. 25% d. 30%

To pinpoint the leak, which of the following shall be used? a. Ultrasonic leak detector b. Elctronic leak detector c. Soap bubbles

T/F If the discharge service vavle is open do not energize a reciprocating compressor.

T/F In order to recover refrigerant a technician must isolate a parallel compressor system.

What standard requires that a refrigerant sensor sounds an alarm and automatically starts a ventilation system in an occupied equipment room where refrigerants from a leak will concentrate? a. ASHRAE standard 15 b. ASHRAE standard 30 c. ASHRAE standard 45 d. ASHRAE standard 60

In what phase will the recovering refrigeratn minimize the loss of oil? a. Liquid b. Vapor c. Either vapor or liquid

T/F By packing the recovery cylinder in ice and/or applying heat to the appliance, the technician may speed up the recovery process.

T/F The receiver is not part of the low side of the system in a refrigeration system.

System that contains less than _______ of refrigerant should be used in system dependent recovery devices. a. 10 lbs b. 15 lbs c. 20 lbs d. 25 lbs

Appropriate recovery equipment that has been certified by an EPA approved laboratory (UL or ETL) to meet or exceed ________ describes proper recovery techniques. a. DOT standards b. ASHRAE standards c. API standards d. ARI standards

To check for leaks in the refrigeration sytem, which of the following gases are used? a. Oxygen b. Dry air c. Nitrogen d. Hydrogen

Air and moisture can be caused to eb ingested into the recovered refrigerant if evacuated ________ ambient pressure. a. Above b. Below c. Equal to

__________ indicates that the cylinder is designed to hold the recovered refrigerant. a. Yellow body and a gray top b. Gray body and yellow top c. Yellow body and a blue top d. Blue body and a yellow top

All commercial and industrial process refrigeration containing more than 50 lbs of refrigerant must be repaired when the annual leak rate exceeds ________, according to EPA regulations. a. 20% b. 25% c. 30% d. 35%

Before expansion, where would a moisture indicating sight glass being used be located in relation to the filter drier? a. Upstream b. Downstream c. Either upstream or downstream

Every ________, leaks should be checked in the recovery or recycling unit. a. 1 month b. 3 month c. 6 month d. Every month

What is the name of the device designed to trap acid and particulates and remove water from the refrigerant? a. Filter drier b. Accumulator c. Evaporator d. Waste collector

What is the rating of all recovey cylinders? a. Temperature b. Volume c. Density d. Pressure

Which of the follwing parameters affects the amount of refrigeration that is absorbed? a. Temperature b. Volume c. Dnsity d. Pressure

Which of the following must be vaporized to get out of the accumulator? a. Refrigerant only b. Oil only c. Both refrigerant and oil

Which system are type II certified technicians uncertified to work with? a. Low b. Medium c. High d. Very high

In order to reduce the time of recovery of R-11 and R-23 from a low pressure system, they must be recovered as a a. liquid b. gas

Typically, open drive compressors are _____ compressors. a. Screws b. Scroll c. Centrifugal d. Reciprocating

The required level of evacuation for low pressure equipment is ______ Hg absolute, when using recovery or recycling equipment manufactured or imported on or after Nov 15, 1993. a. 15 mm b. 20mm c. 25mm d. 30mm

Which agency must approve all refrigeration recovery cylinders? a. ARI b. ASHRAE c. OSHA d. DOT

Where does the purge unit take its suction from? a. Evaprator b. Compressor c. Expansion device d. Condenser

At what psig does a rupture disk open, in a low pressure system? a. 10 psig b. 15 psig c. 20 psig d. 25 psig

When the annual leak rate exceeds ________, the EPA requires that all commercial and industrial process refrigeration system with more than 50 lbs of refrigerant be repaired. a. 15% b. 25% c. 30% d. 35%

To what standard should one verfiy that the unit is ARI certified in order to ensure the purge unit will perform to its published efficiency rating? a. 580 b. 700 c. 750 d. 1000

Check the recovery or recycling unit for leaks every ______ months or as required by the manugacturer of your unit. a. 2 b. 3 c. 6 d. 9

Reverse acting rupture disks are installed with the process pressure against the ______ side of the disk. a. Concave b. Convex

What level psig is a high pressure cutoff set to on a recovery unit that is use in a low pressure system? a. 10 psig b. 15 psig c. 20 psig d. 25 psig

What is the required level of evacuation for low pressure equipment when using recovery equipment manufactured or imported before Nov 15, 1993? a. 15" Hg b. 20" Hg c. 25" Hg d. 30" Hg

When leak testing a water tube on a _______ pressure chiller, a hydrostatic test kit is used. a. High b. Low

Low

Which of the following chillers have potentially lower overall energy costs? a. Water to water chiller b. Water to air chiller

To remove noncondensables from the system, a purge unit is used on ________ pressure chillers. a. Low b. High

What does the absorption chiller use to provide cooling? a. Electricity b. Heat c. Either heat or electricity

If they contain a refrigerant with a pressure above ________ at room temperature, all recovery cylinders must be DOT approved and have a cuurent hydrostatic test date stamped on them. a. 15 psig b. 20 psig c. 25 psig d. 30 psig

T/F Water to water temperature uses R-123 refrigerant.

T/F The chiller must reject the heat to the exterior ambient air, like any air conditioner.

A refrigerant with a liquid phase saturation pressure below _______ at 104 F is a low pressure appliance. a. 25 psia b. 35 psia c. 45 psia d. 50 psia

T/F Test at the drain valve after the water has been removed when a elctronic leak detector is used to test a water box for leaks.

Adding warm water over the coil to raise the pressure to ________ is the easiest way to leak test a low pressure system. a. 10 psig b. 15 psig c. 20 psig d. 25 psig

T/F To remove the noncondensable from the system, a purge unit is used on high pressure chillers.

When the annual leak rate exceeds ________ the EPA requires that all comfort cooling systems with more than 50 lb of refrigerant be repaired. a. 15% b. 20% c. 25% d. 30%

Water is commonly run through the chiller tubes to prevent a ________ pressure system from freezing during evacuation. a. High b. Low

What is the coefficent of performance in cooling (COPc) of absorption chillers? a. Poor b. Very poor c. High d. Very high

Once the systems is evacuated, when the refrigerant flow is substantially reduced, the motor may a. Burn out b. Stop c. Slow d. Run normally

Open-drive compressors are typically ______ compressors a. Reciprocating b. Screw c. Centrifugal d. Scroll

If a liquid receiver is used, it is located downstream of the ________ a. Condenser b. Compressor c. Expansion device d. Evaporator

T/F Water line leading to each section of the building or refrigerant lines leading to individual sections are more expensive to install than air ducts which are smaller.

ASHRA guidelines 3-1990 states that the system should be leak tested if, during an evacuation, a 1 mm Hg vacuum level rises to _______. a. 1 mm Hg b. 2 mm Hg c. 2.5 mm Hg d. 5 mm Hg

Pressurizing the system with vapor up to the _______ saturation temperature, after a chiller system has had a deep system evacuation, is commonly done to decrease the possibility of system freeze up prior to a liquid change. a. 24 F b. 25 F c. 28 F d. 36 F

T/F One member of the group of B-1 refrigerants is R-123

What level psig is a high pressure cutoff set to on a recovery unit that is used on low pressure systems? a. 10 psig b. 15 psig c. 20 psig d. 25 psig

Approximately how many pounds of vapor is in a 350 ton R-11 chiller? a. 50 lbs b. 100 lbs c. 150 lbs d. 200 lbs

A separate receiver is not necessary in which of the following system? a. Water to air systems b. Water to water systems

5 tons are _______ BTU/hour a. 45,000 b. 50,000 c. 60,000 d. 72,000

EPA section 608 certification has _______ expiration date. a. an annual b. two years c. five years d. no expiry date

Before opeing the system to the air, break the vacuum with ______ whenever you evacuate a system to subambient pressures. a. Dry nitrogen b. Dry oxygen c. Dry air d. Dry carbon dioxide

Higher initial cost and increased maintaince costs belongs to which? a. Water to air chillers b. Water to water chillers

Below what number of refrigerant per pound of air purged must the ARI-certified, tested refrigerant to air emmission ration be? a. 0.5 lbs b. 0.6 lbs c. 0.8 lbs d. 0.9 lbs

When leak testing a low pressure system, it is important not to exceed _______ because the rupture disk, located on the evaporator, might fail. a. 10 psig b. 15 psig c. 20 psig d. 25 psig

When reusing a refrigerant (either recycled or simply recovered and replaced) it should be tested for purity with an ______ purity test. a. ARI 700 b. ARI 750 c. ARI 1000 d. ARI 1200

What kind of system can be used only with self-contained recovery devices? a. High pressure b. Low pressure

T/F Just after the condenser and before the expansion device, the liquid reciver is typically loacted.

At about what rate per year can an electronic leak detector detect leak rates? a. 0.25 oz b. 0.5 oz c. 1 oz d. 1.5 oz

Slightly _____ refrigerant leaves the condenser. a. Subcooled liquid b. Supercooled liquid c. Subcooled gas d. Supercooled gas

Substantial leaks shall be repaired for a duration of within a. 15 days b. 30 days c. 60 days d. 120 days

A system should be checked for leaks, according to ASHRAE Guideline 3-1996, if the pressure in a system rises from 1 mm Hg to a level above ________ during a standing vacuum test. a. 1 mm Hg b. 1.5 mm Hg c. 2 mm Hg d. 2.5 mm Hg

T/F To remove noncondensable gases and impure oil from the system is the primary purpose of a purge unit on any low pressure system.

A system with a _______ refrigerant is faster to recover. a. Liquid b. Vapor c. Recovery rate is the same

Determining the current leak rate and projecting it over a _______ period is a good way to calcute the leakage rate. a. 3 month b. 6 month c. 9 month d. 12 month

Oil will not be removed from the system if the refrigerant is recovered in a _____ pahse. a. Liquid b. Vapor c. Either liquid or vapor

The recovery will be _____ when the pressure in the sytem is reduced. a. Slower b. Faster

T/F As per ASHRAE, the leak-testing blend (nitrogen plus the leak check gas) shall be recovered.

Tension type rupture disks are installed with process pressure against the _____ side of the disk. a. Concave b. Convex

T/F A potentail acid burnout has occured if there is a pungent odor during recovery and/or repair.

What is the typical setting for the high pressure cutoff control on a recovey unit used for evacuating the refrigerant from a low pressure chiller? a. 10 psig b. 15 psig c. 20 psig d. 25 psig

Which of the following leak detection methods is not an effective way of detecting the general area of a small leak? a. Electronic leak detection method b. Ultrasonic leak detection method c. Flame test

In which form are refrigerants removed by recovery units? a. Vapor phase b. Liquid phase c. Either as a liquid or vapor

Refrigerant should be charged into the system in which of the following phased in order to avoid freezing the water in tubes while charging the refrigerant into the system? a. Vapor phase b. Liquid phase

For leak detection in the system which of the following gases in used? a. HCFC-22 b. R-12 c. R-114 d. R-500

A technician can take up to ______ to repair the leak if there is a need to shut down an industrial process to fix the leak. a. 60 days b. 120 days c. 150 days d. 180 days

Whenever you evacuate a system to subambient pressure, always break the vacuum with _____ before opening the system to the air. a. Dry air b. Dry oxygen c. Dry nitrogen d. Dry carbon dioxide

T/F A cold recovery tank can achieve the fastest recovery

A technician must have an equipment room refrigerant monitor when working with refrigerants, according to _____. a. ASHRAE Standard 3 b. ASHRAE Standard 5 c. ASHRAE Standard 15 d. ASHRAE Standard 30

T/F To determine if a tube leaks, a hydrostatic tube test kit is used.

A technician must have an equipment room refrigerant monitor when working with refrigerants, according to ______. a. ASHRAE Standard 5 b. ASHRAE Standard 15 c. ASHRAE Standard 3 d. ASHRAE Standard 30

T/F In large quantites, refirgerants are lighter than air.

A substantial leak, as defined by the EPA, is ______ or more of teh normal charge for industrial, process, and commercial refrigeration systems. a. 15% b. 20% c. 25% d. 35%

At what psig does the standard rupture disk on a negative pressure CFC-11 or HCFC-123 chiller shatter? a. 10 psig b. 15 psig c. 20 psig d. 25 psig

Just ________ of teh expansion device in the liquid line, a refrigerant sight glass shall be typically located. a. Downstream b. Upstream

T/F Because the low side of the system operates above atmospheric pressure, the low pressure systems require purge units

T/F Semi-heretic centrifuagla or screw compressors are typically used with small chillers.

T/F To decrease the rate of recovery, in high ambient conditions, use a recovery unit with a subcooling feature.

T/F In order to prevent freezing the water when evacuating the refrigerant, water must be circulated through the tubes.

It may be necessary to _______ pressure by introducing nitrogen to counteract freezing during evacuation of systems with large amounts of water. a. Decrease b. Increase

T/F Air in a building is directly cooled through the use of a chiller, which is a vapor compression system.

When evacuating the refrigerant from a low pressure chiller, a recovery unit's high pressure cutoff is set from _____. a. 5 psig b. 10 psig c. 12 psig d. 15 psig

T/F Most low pressure recovery machines utilize a water cooled condenser that is connected to the municipal water supply.

Relieving overpressure and resealing can be enacted by which of the following devices? a. Rupture disk b. Pressure relief valve c. Both options are correct

The sale of CFC and HCFC refrigerants become restricted to certified technicians after what date? a. Nov 14, 1992 b. Nov 14, 1991 c. Nov 14, 1993 d. Nov 14, 1994

After what date did it become mandatory for refrigerant recovery and/or recycling equipment to be certified and labeled by an EPA-approved equipment testing organization and meet EPA standards? a. Nov 15 1994 b. Nov 15, 1995 c. Nov 15 1993 d. Nov 15 1992

At this ___ temperature, fewer refrigerants are contained in the oil. a. Higher b. Lower

The refrigerants will _____ when introducing the liquid refrigerants into a deep vacuum. a. Freeze b. Boil

The liquid receiver is located downstream of the _____. a. Condenser b. Compressor c. Evaporator d. Expansion device

Using recovery or recycling equipment manufactured or imported before Nov 15, 1993 for evacuation for low pressure appliances should be a. 4 inches Hg absolute b. 4 inches Hg c. 25 inches Hg d. 25 inches Hg absolute

The typical design burst pressure for a rupture disk for protecting the low pressure chillers against overpressurization is a. 5 psig b. 10 psig c. 12 psig d. 15 psig

Refrigerant recovery from a sytem using R-123 starts with _____ removal and is followed by ____ recovery. a. Vapor, liquid b. Liquid, Vapor

When the annual leak rate exceeds _______, the EPA requires that all comfort cooling appliances containing more than 50 lbs of refrigeant be repaired. a. 5 % b. 15% c. 25% d. 35%

T/F Removing noncondensable from the system is the primary purpose of a purge unit.

If the pressure in a system rises from a 1 mm Hg to a level above ____ during vacuum testing, according to ASHRAE Guideline 3-1996, the system should be leak checked. a. 2 mm Hg b. 2.5 mm Hg c. 4 mm Hg d. 8 mm Hg

What is the typical design burst pressure for a rupture disk on a low pressure centrifugal chiller system set to? a. 5 psi b. 10 psi c. 15 psi d. 25 psi

Below what weight of refrigerant per pound of air purged should the ARI certified, tested refrigerant to air emmission ratio be? a. 0.2 pounds b. 0.5 pounds c. 0.6 pounds d. 0.8 pounds

When the annual leak rate exceeds _______, EPA regulations require that all commercial and industrail process refrigeration containing more than 50 lbs of refrigeration be repaired. a. 5% b. 10% c. 15% d. 35%

T/F Pressurizing the system by the use of controlled hot water or heater blankets is the most efficient method of leak checking a charged low pressure refrigeration unit.

If the recovery cylinder contains a refrigerant with a pressure above _____ at room temperature, it must be DOT approved and have current hydrostatic test date stamped on them. a. 5 psig b. 10 psig c. 12 psig d. 15 psig

In what form does the refrigerant leave the compressor? a. High pressure vapor b. Low pressure vapor c. High pressure liquid d. Low pressure liquid

T/F CFC -12, CFC-11, and HFC-134a are code grouped as A-1 refrigerants.

To what standard must the ARI-certified purge unit be comformed to if it will perform at its published efficiency rating? a. Standard 240 b. Standard 360 c. Standard 420 d. Standard 580