System vacuum level is measured with the __________.

 A. system isolated

B. vacuum pump running

 C. system compressor running

D. recovery system running

 Capturing and ultimately eliminating the use of chlorofluorocarbons is being done in the United States

to stop damage to:

 A. the stratospheric ozone layer B. ground level ozone

 C. ultraviolet light D. infrared light

 ________ in refrigerants causes ozone destruction.

 A. Chlorine B. Both chlorine and fluorine

 C. Fluorine D. Both fluorine and carbon

 When using recovery and recycling equipment manufacured AFTER November 15, 1993, technicians must evacuate an appliance component containing very high pressure refrigerants, such as CFC-113 and -503 to ______ of mercury vacuum before making a major repair, independant of the quantity of refrigerant in the system.

 A. 0.0" B. 10"

 C. 15" D. 28.9"

 An example of an HCFC refrigerant is _______.

 A. R-134a B. R-115

 C. R-22 D. R-11

During dehydration of a refrigeration system, the refrigeration system is heated to:

 A. to prevent oxidation              

B. to increase oil viscosity

 C. to decrease dehydration time        

D. to increase dhydration time

 Each chlorine atom in the stratosphere can

destroy_____ ozone molecules.

 A. one hundred B. one thousand

 C. ten thousand D. one hundred thousand

After completing the transfer of liquid refrigerant between the recovery unit and the refrigeration system, you must be careful to avoid trapping liquid refrigerant between service valves because__________.

A. there is no pressure relief valve on the typical hose and the liquid refrigerant trapped in the hose could build up significant pressure and rupture the hose

B. low loss fittings are required since January 1992

C. there is no reason not to trap liquid refrigerant in the hose since it will avoid venting of refrigerant.

D. all of the above

A ______ refrigerant has a range of boiling points or condensing points throughout the evaporator and condenser, respectively. The term used to describe this is "temperature glide" or "gliding temperature".

 A. non-azeotropic B. azeotropic

 C. pure D. reclaimed  

Discarding of disposable cylinders is accomplished by:

A. bleeding refrigerant to ambient air and throwing the cylinders into the trash.

B. assuring that all refrigerant is recovered and that cylinders are rendered useless, then recycling the metal.

C. adding nitrogen to the cylinders, so that you have a leak check gas

D. filling with compressed air for fixing flat tires.

When using recovery and recycling equipment manufactured AFTER November 15, 1993, technicians must evacuate an appliance containing MORE than 200 lbs of R-22 to _____ of mercury vacuum before making a major repair.

A. 5"

B. 10"

 C. 15"

D. 28.9"

 HFCF refigerants cause what amount of damage to the stratosphere ozone layer in comparison to CFC refrigerants.

 A. more

B. less

 C. equal

D. severe

When transporting cylinders containing used refrigerant, DOT requires that you:

 A. use OSHA approved  containers

B. attach DOT classification tags

 C. ship by EPA certified carrier

D. all of the above

_______ means to clean refrigerant for reuse by oil seperation and single or multiple passes through devices, such as replaceable core filter driers which reduce moisture, acidity and particulate matter.

 A. Recovery

B. Recycling

 C. Reclamation

D. Recirculate

Ozone depletion in the stratosphere is what type of problem?

 A. local

B. regional

 C. national

D. global

The component which changes low pressure vapor to a high pressure vapor is the:

 A. evaporator

B. condenser

 C. compressor

D. expansion valve

Under EPA's regulations, reclaimed refrigerant must meet which standards for purity before it can be resold.

 A. ARI 700

B. ARI 740

 C. SAE 1792

D. EPA 1992

Chlorofluorocarbons (CFC) consist of ___, ___, and___.

 A. chlorine, fluorine, carbon

B. chlorine, fluorine, cesium

 C. carbon, fluorine, other chemicals

D. cesium, fluorine, carbon

______ are a result of damage to the Earth's ozone layer.

A. Skin cancers

B. Cataracts

C. Reduced crop yields

D. All three

A device that removes air and other non-condesables from the refrigerant system, is typically located_____.

A. at the top of the condenser

B. at the inlet to the evaporator

C. at the compressor

D. at the compressor discharge

State and local governments may establish laws that contain _____ regulations than Clean Air Act/EPA regulations.

A. stricter

B. less restrictive

C. either A or B

D. neither A or B

.1mm of mercury = 0.039 inch of mercury = ___ microns.

A. 10

B. 100

C. 500

D. 1000

It has been illegal to vent HFC refrigerants since:

A. November 1995

B. December 1995

C. July 1994

D. June 1996

______ is the cleaning of refrigerant for reuse by oil seperation and single or multiple passes through moisture absorption devices.

A. Recirculation

B. Recycling

C. Recovery

D. Reclaimation

Which of the following is a CFC:

A. R-141b

B. 134a

C. R-502

D. R-123

All persons opening appliances for maintenance, service or repair must have at least one piece of certified, self-contained recovery equipment available at their place of business. The only exception is for:

A. chillers

B. high pressure appliances

C. small appliances

D. very high pressure appliances

Small appliance recovery equipment manufactured AFTER November 15, 1993 must be certified to be capable of:

A. Recovering 80% of the refrigerant when the compressor is not operating or achieving a 4 inch vacuum under the conditions of ARI 740-1993.

B. Recovering 90% of the refrigerant when the compressor is not operating or achieving a 4 inch vacuum under the conditions of ARI 740.

C. Recovering 95% of the refrigerant when the compressor is not operating or achieving a 10 inch vacuum under the conditions of ARI 740-1993.

D. Recovering 85% of the refrigerant when the compressor is not operating or achieving a 10 inch vacuum under the conditions of ARI 740-1993.

. Recovering 80% of the refrigerant when the compressor is not operating or achieving a 4 inch vacuum under the conditions of ARI 740-1993.

The _____ 49 CFR, requires that the number of cylinders of each gas be recorded on the shipping paper for hazard class 2.2 Nonflammable compressed gases.

A. DOT

B. ARI

C. EPA

D. OSHA

At high temperatures (i.e., open flames, glowing metal sufaces, etc.), R-12 and R-22 can decompose to form___.

A. hydrochloric acid

B. hydrofuoric acid

C. citric acid 

D. both A and B

E. both B and C

When recovering refrigerant into a non-pressurized container from a refrigerator with an inoperative compressor:

A. It is only necessay to recover as much refrigerant as will naturally flow out of the system.

B. It is not necessary to recover since the refrigerant is probably contaminated.

C. It is necessary to chase refrigerant from the oil with pressurized dry nitrogen.

D. It is necessary to heat and strike the compressor sharply several times and/or use a vacuum pump.

If R-12 or R-22 is exposed to a glowing metal surface, the refrigerant can decompose to form:

A. hydrazine gas

B. phosgene gas

C. helium gas

D. none of the above

DOT Regulations, 49 CFR, requires that the __________ be recorded on the shipping paper for hazard class 2.2, nonflammable compressed gases?

A. weight of each cylinder

B. total cubic feet of each gas

C. number of cylinders of each gas

D. total weight of all cylinders

When filling a charging cylinder, the refrigerant that is vented off the top of the cylinder______.

A. must be recovered

B. need not be recovered

C. must be reclaimed

D. must be recirculated

Which of the following definitions best describes the small appliance recovery category?

A. Includes all products manufactured, charged, and hermetically sealed in a factory with 2 pounds or less of refrigerant.

B. Includes products manufactured, charged and hermetically sealed in a factory with 5 pounds or less of refrigerant.

C. Includes miniature refrigerators, freezers, dehumidifiers and some split-systems central air conditioning.

D. Includes all appliances charged with 5 pounds or more of refrigerant.

B. Includes products manufactured, charged and hermetically sealed in a factory with 5 pounds or less of refrigerant.

Small appliances serviced by recovery equipment manufactured after November 15, 1993 must be able to _________.

A. recover 90% of the refrigerant when the system's compressor is operational (not defective) or acheiving a 4 inch vacuum inder the conditions of ARI 740.

B. recover 90% of the refrigerant when the system's compressor is operational (not defective) or achieving a 10 inch vacuum under the conditions of ARI 740.

C. recover 80% of the refrigerant.

D. recover 98% of the refrigerant.

A. recover 90% of the refrigerant when the system's compressor is operational (not defective) or acheiving a 4 inch vacuum inder the conditions of ARI 740.

It is generally recommended that piercing -type valves be used only on ____ tubing.

A. copper

B. aluminum

C. steel

D. both A and B

E. both A and C

_____ may be present in refrigerants used in small appliances in campers or other recreational vehicles and should not be recovered with current recovery methods.

A. Ammonia

B. Hydrogen

C. Water

D. All of these

Recovery equipment for use on small appliances which was manufactured after November 15, 1993 must be certified to be capable of:

A. recovering 90% of the refrigerant when the compressor is operating or achieving a 4 inch vacuum under the  conditions of ARI 740-1993

B. recovering 80% of the refrigerant when the compressor is operating

C. recovering 95% of the refrigerant when the compressor is operating or achieving a 10 inch vacuum under the conditions of ARI 740-1993

D. Recovering 75% of the refrigerant when the compressor is operating

______, refrigerants used in some refrigerators built before 1950, should not be recovered with current recovery hardware.

A. Sulfur dioxide

B. Methyl chloride

C. Methyl formate

D. All of these

EPA regulations define a "small appliance" as one manufactured, charged and hermetically sealed at the factory and containing ____ pounds or less of refrigerant.

A. 2

B. 5

C. 10

D. 14

After recovering refrigerantfrom a sealed system, if nitrogen is used to pressurize or blow debris out of the system, the nitrogen:

A. must be recovered

B. may be vented

C. should not be used

D. only be used if mixed with R-22

Currently the refrigeration technical certification has_______.

A. no expiration date

B. a five year expiration date

C. a 2010 expiration date

D. a two year re-certification reqirement

There is a huge leak of R-22 in a contained area, which of the following is true?

A. Safety goggles and lined butyl gloves are suffient protection.

B. Leave the area and return wearing self-contained breathing apparatus.

C. Resiratory protection is not required.

D. Dust masks are sufficient to filter out the refrigerant.

B. Leave the area and return wearing self-contained breathing apparatus.

Small appliance recovery equipment manufactured after November 15, 1993 must be certified to be capable of recovering _____ of the refrigerant when the compressor is inoperative or achieving a 4 inch vacuum under the conditions of ARI740-1993.

A. 70%

B. 80%

C. 90%

D. 100%

After installing and opening a piercing access valve, if the system pressure is ______ do not begin the recovery prodecure.

A. 75 psig

B. 50 psig

C. 30 psig

D. 0 psig

Recovery devices manufactured BEFORE November 15, 1993 for use with small appliances must meet which of the following requirements?

A. Capable of recovering 80% of the refrigerant whether or not the compressor is operating or achieving a 4 inch vacuum under conditions of ARI 740-1993

B. Capable of recovering 70% of the refrigerant if the compressor is operating or acheiving a 4 inch vacuum under conditions of ARI 74-199300

C. Capable of recovering a 10 inch vacuum under conditions of ARI 74-1993

D. No requirements; this equipment would be considered "grandfathered".

R-12 or R-22 can decompose to form:

A. Hydraine gas

B. Phosgene gas

C. Helium gas

D. None of the above

Since _____, all appliances must be equipped with a service apeature or other device which is used when adding or removing refrigerant from the appliance. For small appliances, this service port typically is a straight piece of tubing that is entered using a piercing access valve.

A. July 1, 1992

B. November 15, 1993

C. November 14, 1994

D. December 31, 1995

All recovery devices for use with small appliances that were manufactured before November 15, 1993 must be capable of recovering ____ of the refrigerant whethter or not the compressor is operating or achieving a 4 inch vacuum under conditions of ARI 740-1993.

A. 70%

B. 80%

C. 90%

D. 100%

After recovering refrigerant from a sealed system, if nitrogen is used to pressurize or blow debris out of the system, the nitrogen ______.

A. can be vented, since air is 80% nitrogen

B. cannot be vented, since nitrogen destroys the ozone

C. must be recovered and recyled

D. must be recovered

Small appliances containing HCFC refrigerants can be evacuated to atmospheric pressure when _____.

A. the repair is major

B. the reipair is followed by and evacuation of the appliance to the environment

C. leaks make evacuation to the prescribed level unattainable

D. the appliance is being disposed of

Pressure relief valves must NOT be installed:

A. in series

B. in parallel

C. vertically

D. horizontally

Non-condensables in a refrigeration system result in a _______.

A. higher discharge pressure

B. lower discharge pressure

C. excessive vibration

D. excessive noise

Which of the following would be considered a "major" repair by the EPA?

A. replacing the condenser

B. replacing an evaporator coil

C. replacing the compressor

D. all of the above

EPA regulations require that all appliances containing more than 50 lbs of refrigerant (except for commercial and industrial process refrigeration) be repaired when the leak reate exceeds ___ of the charge per year.

A. 10%

B. 15%

C. 30%

D. 35%

What would be the result of a leak in a high pressure system?

A. high head pressure

B. low water temperature

C. excessive superheat

D. frequent purging

EPA regulations require that leaking commercial and industrial process refrigeration systems, containg 50 lbs or more of refrigerant, be repaired when the leak rate exceeds___ percent of the charge per year.

A. 0

B. 15

C. 25

D. 35

If a srvice technician's recovery equipment was manufactured BEFORE November 15, 1993, he must evacuate a refrigeration system containing 10 pounds of R-500 to _____.

A. psig

B. inches of mercury

C. 10 inches of mercury

D. 15 inches of mercury

E. 20 inches of mercury

F. 28.9 inches of mercury

Technicians are certified to recover refrigerant during the maintaenance, service, or repair of high pressure equipment if they receive a passing grade on which of the following examinations.

A. Type I

B. Type II

C. Type III

D. DOT

_____ must be recovered before disposing of an appliance containg this refrigerant.

A. R-12

B. R-22

C. R-134a

D. R-123

E. R-500

F. All of the above except R-134a

G. All of the above except R-123

H. All of the above

When evacuating a vapor compression system, the vacuum of ________ microns.

A. 10

B. 100

C. 500

D. 1000

When using recovery or recycling equipment manufactured AFTER November 15, 1993, technicians must evacuate an appliance component containing MORE than 200 pounds of CFC-12 to the following level before making a major repair:

A. 0 psig

B. 4 inches of mercury vacuum

C. 10 inches of mercury vacuum

D. 15 inches of mercury vacuum

System-dependant recovery equipment CANNOT be used when the appliance contains over____ pounds of refrigerant.

A. 5

B. 10

C. 15

D. 25

Recovery equipment manufactured after November 15, 1993 that is used during the maintenance, service or repair of small appliances must be certified by:

A. an EPA approved third party

B. the equipment manufacturer

C. an EPA certified technician

D. the equipment distributor

Replacement of _____ is a repair which would asways be considered "major" under EPA's regulations.

A. an evaporator coil

B. a condenser

C. a filter drier core

D. a condenser fan motor

E. both A and B

F. all of the above

System-dependent recovery equipment CANNOT be used when:

A. the compressor is operational

B. the temperature is over 95 F

C. the charge is more than 15 pounds

D. the charge is more than 5 pounds

When using recovery and recycling equipment manufactured AFTER November 15, 1993, technicians must evacualte an appliance containing LESS than 200lbs of CFC-12 to _____ of mercury vacuum before making a major repair.

A. 0.0"

B. 10"

C. 15"

D. 28.9"

What is the first thing that should be done when a new air conditioning system has first been assembled and is ready for testing?

A. pressurize the system with nitrogen and perform a leak test.

B. perform a standard vacuum test

C. pressurize with R-12 and leak test

D. pressurize with HFC-134 

The recovery of refrigerant from a heat pump in the vapor phase will minimize the loss of _____.

A. ozone

B. lubricant

C. non-condensables

D. all of these

Removal of the refrigerant charge from a system can be conducted more quickly by ____ the recovery tank.

A. cooling

B. heating

C. shaking

D. both B and C

Recovering refrigerant from a system in ___ will minimize the loss of oil from the system.

A. vapor phase

B. liquid phase

C. two-phase

D. none of these

What is the most probable water source for a recovery unit condensing coil?

A. chilled water

B. condenser water

C. local water supply

D. distilled water

When you have no other choice but to use a refrigerant trace gas, which refrigerant should be used for leak detection?

A. R-134a

B. R-12

C. R-22

D. R-123

____ is one indicator of a leak in a high pressure refrigeration system.

A. Excessive superheat

B. Excessive sub-cooling

C. Excessive vibration

D. Loss of superheat

With an air cooled condenser on the roof of a two story building and the evaporator on the first floor, it would be best to start recovery _____.

A. from the compressor inlet

B. from the discharge of the compressor

C. from the liquid line entering the evaporator

D. from the liquid line leaving the condenser

How would you determine when enough vapor has entered the refrigeration system before charging with refrigerant liquid?

A. When the saturation temperature is above the freezing point of water.

B. When the pressure relief valve vents slightly.

C. When the recovery unit shuts off.

D. After 2.5 minutes.

A. When the saturation temperature is above the freezing point of water.

The PRIMARY purpose of a purge unit on a CFC-11 Chiller is to ________.

A. purge CFC's from the system

B. condense water from the system

C. condense air out of the system

D. clean the refrigerant

E. remove non-condensables from the system

F. purge solid particles from the system

Because a _____ system operates below atmospheric pressure, system leaks result in air and other contaminates leaking into the system.

A. R-11

B. R-22

C. R-123

D. R-134a

E. Both A and C

F. None

When recharging an R-11 system, the first step is to charge the unit with refrigerant vapor. Refrigerant vapor is charged into the system until the refrigeration saturation temperature is above ______.

A. 0.0 F

B. 20.0 F

C. 32.0 F

D. 80.0 F

Technicians are certified to recover refrigerant during the maintenance, service, or repair of low pressure equipment if they receive a passing grade on which of the following examinations.

A. Type I

B. Type II

C. Type III

D. Type I and II

According to the EPA, what method can be used to pressurize a system for the purpose of opening the system for a non-major repair?

A. add nitrogen

B. use hot water

C. add HFC-134a

D. add HCFC-22

When evacuating the refrigerant from a low pressure chiller, using a push-pull method the recovery unit's high pressure cut-out should be set for ______.

A. 2 psia

B. 2 psig

C. 5 psia

D. 5 psig

E. 10 psia

F. 10 psig

G. 15 psia

H. 15 psig

The EPA believes that the most effective method of  leak checking low pressure refrigeration machines is with______.

A. dry nitrogen

B. HCFC-22

C. hot water

D. the purge system

Replacement of ___ is a repair which always be considered "major" under EPA's regulations.

A. an evaporator coil

B. a condenser

C. a filter drier core

D. a condenser fan motor

E. both A and B

F. all of the above

When charging an evacuated chiller system, why is refrigerant vapor re-introduced to the refrigeration system before refrigerant liquid?

A. Vapor carging increases pressure slowly. preventing failure of the rupture disk.

B. Vapor charging is faster than liquid charging.

C. Liquid chaging is more difficult to control than vapor charging.

D. Liquid charging into a deep vacuum will boil and may lower temperatures enough to freeze water in the tubes.

A purge unit on low pressure systems:

A. returns recyled refrigerant to the unit

B. removes air and non-condensables from the system

C. have been outlawed by the EPA

D. all of the above

Which of the following statments is NOT true of EPA approved recovery equipment manufactured after November 15, 1993.

A. It must meet EPA standards.

B. It must meet vacuum standards more stringent than those met by equipment manufactured before November 15, 1993.

C. It must be equipped with low-loss fittings.

D. It must be able to handle more than one refrigerant.

D. It must be able to handle more than one refrigerant.

Under EPA's regulations it is allowable to do which of the following to pressurize a R-11 system for the purpose of opening the system for non-major repair.

A. use an open flame gently applied to the condenser

B. warm the refrigerant

C. use a propane gas or acetylene-air torch but not an oxygen-actylene torch, since this would be too hot.

D. both B and C

When recharging a refrigeration system with R-11, ____vapor pressure is necessary in the shells before charging with liquid.

A. 20" hg vacuum

B. 17" hg vacuum

C. 10 psig

D. 27 psia

The EPA defines _____ as maintenance, service, or repair that involves removal of the appliance's compressor, condenser, evaporator, or auxiliary heat exchanger coil.

A. major maintenance

B. minor maintenance

C. system maintenance

D. service maintenance

EPA regulations require that leaking commercial and industrial process refrigeration that contains more than 50 pounds of refrigerant be repaired when the leak rate exceeds ___ of the charge per year.

A. 10%

B. 15%

C. 30%

D. 35%

When using recovery equipment manufactured BEFORE November 15, 1993 you must evacuate a low pressure chiller to what levelbefore making a major repair:

A. 0 psig

B. 15 inches of mercury vacuum

C. 25 inches of mercury vacuum

D. 28 inches of mercury vacuum

According to the EPA, when removing oil from a low pressure system, the temperature should be how warm to reduce the quantity of refrigerant contained in the oil.

A. 65 F

B. 40 F

C. 80 F

D. 130 F

When leak testing a low pressure centrifugal with nitrogen, the maximum test pressur is ___?

A. 0 psig

B. 10 psig

C. 25 psig

D. 50 psig

A rupture disk on a recovery vessel for low pressure refrigerants relieves at ____.

A. 5 psig

B. 5 psia

C. 10 psig

D. 10 psia

E. 15 psig

F. 15 psia

On a centrifugal system, the purge unit suction is connected to the ___.

A. condenser

B. evaporator

C. oil sump

D. suction side compressor inlet

A hydrostatic tube test kit will:

A. determine if a tube leaks

B. blow all water out of tubes

C. remove water from a machine

D. vent refrigerant atmosphere

For a standing vacuum test according to ASHRAE gudeline 3-1996 if the pressure rises from 1mm Hg to a level above ____, the system should be checked for leaks.

A. 0.5mm hg

B. 1.0mm hg

C. 2.0mm hg

D. 2.5mm hg

Hydrostatic tube tests are used to _____.

A. find if a tube has any leaks

B. quickly evacuate the system

C. remove water from the system

D. vent water to the atmosphere

Appliances containg refrigerant can be evacuated to ___, when leaks in the appliance make evacuation to the EPA presbibed level unattainable since air would be drawn into the recovery device from the surrounding.

A. 0.0 psig

B. 1.0 psig

C. 2.0 psig

D. 5.0 psig