What is the approximate pressure of a storage cylinder of recovered r410a that does not contain

Which hydrocarbon refrigerant is approved for retrofit into existing household refrigerators?A. HC R-600a 2 ounces or lessB. Blended HC R-441Ae. HC R-290 lb. or lessD. Hydrocarbons are not approved for retrofit applications

D. Hydrocarbons are not approved for retrofit applications

Equipment which is used to recover CFC,HCFC,and HFC refrigerant from small appliances for the purposeof disposal must meet what standard?A. Recover 95% or the refrigerant whether or not the compressor is operative.B. Recover 80% of the refrigerant with an inoperative compressor and 90% of the refrigerant with anoperative compressor.e. Recover 90% of the refrigerant with an inoperative compressor and 80% of the refrigerant with anoperative compressor.D. Recover 75% of the refrigerant within 5 minutes.

B. Recover 80% of the refrigerant with an inoperative compressor and 90% of the refrigerant with anoperative compressor.

Which of the following best describes low loss fittings, on refrigerant recovery devices used to recoverCFCs,HCFCs,and HFCs?A. They can be either manually closed or automatically closed when disconnected to prevent loss ofrefrigerant from hoses.B. They are used to connect the recovery device to an appliance and leak only small amounts ofrefrigerant during use.e. They are used to connect the recovery device to an appliance and must be discarded after each use.D. They eliminate oil loss during recovery

A. They can be either manually closed or automatically closed when disconnected to prevent loss ofrefrigerant from hoses.

What type of certification is required for persons recovering CFCs,HCFCs,or HFCs during maintenance,service, or repair of small appliances?A. Type II TechnicianB. Type III Techniciane. Type I Technician or Universal TechnicianD. Technician who has passed the core exam

e. Type I Technician or Universal Technician

For which of the following refrigeration systems/appliances would it be permissible to use a passiverecovery device for recovery of CFCs, HCFCs,and HFCs?A. A centrifugal air conditionerB. A reciprocating liquid chillere. A single compressor, large commercial walk-in freezerD. A domestic refrigerator

D. A domestic refrigerator

What is the maximum normal charge of HCFC or HFC refrigerant in an appliance that is allowed to usesystem dependent recovery equipment? ~A. 5 poundsB. 10 poundse. 15 poundsD. 50 pounds

What is the maximum allowable factory charge of refrigerant for Type I appliances using CFCs,HCFCs,orHFCs?A. 3 poundsB. 5 poundsC. 10 poundsD. 15 pounds

Any person who opens an appliance containing a CFC,HCFC,or HFC for maintenance, service or repairmust have at least one self-contained recovery machine available for use. The exception to this rule arepersons working on:A. small appliances.B. low-pressure appliances.C. high-pressure appliances.D. very high-pressure appliances.

New household refrigerators may be factory charged with any of the following refrigerants, EXCEPT;A. R-290B. R-450AC. R-600aD. R-404A

Which of the following refrigerants is very high pressure and generally does NOT need to be recovered?A. R-22B. R-134aC. R-404AD. R-744

What is the approximate pressure of a storage cylinder of recovered R-404A that does not contain anynon-condensable impurities and is stored in a room where the temperature is 80°F?A. 68 psigB. 72 psigC. 174psigD. 288 psig

Which condition can cause excessive pressure on the high side of a self-contained (active) recoverydevice?A. When the thermal expansion valve is stuck open.B. When the capacity of the recovery tank is larger than the charge size of the system.C. When there is a large volume of non-condensable gas in the refrigerant being recovered.D. When the system is set for no subcooling. (adsbygoogle = window.adsbygoogle || []).push({});

C. When there is a large volume of non-condensable gas in the refrigerant being recovered

Which of the following is an acceptable method or device presently used for monitoring the 80% fill levelt1in a recovery tank?A. Superheat when a capillary tube is present or sub-cooling when a thermostatic expansion valve isused.B. Refrigerant scale or tank internal float device.C. Refrigerant temperature measurement.D. Refrigerant pressure measurement.

B. Refrigerant scale or tank internal float device.

After installing and opening a piercing access valve, the recovery procedure cannot begin ifthe system isat what pressure?A. 75 psigB. 50 psigC. 30 psigD. 0 psig

Which of the following is a true statement regarding a refrigerant that can be used as a direct service'drop-in' substitute for R-22?A. R-134a used with a TEVB. R-41OA used with a TEV that has a MOP of 75psig.C. R-290 with a fixed orifice metering device.D. There is no such thing as a "drop-in" substitute.

D. There is no such thing as a "drop-in" substitute.

Before beginning a refrigerant recovery procedure, it is ALWAYS necessary to;A. allow the appliance to stabilize at room temperature.B. know the type of refrigerant that is in the system.C. remove the appliance to an outdoor location.D. disconnect the appliance from its power source

B. know the type of refrigerant that is in the system

Which condition requires accessing both the high and low side of the system for refrigerant recoverywhen using the system-dependent (passive) recovery process?A. When there is a leak in the system.B. When the compressor operates normally.C. When the compressor only runs at half speed.D. When the compressor does not run. (adsbygoogle = window.adsbygoogle || []).push({});

D. When the compressor does not run

Which recovery equipment maintenance practice should be performed on a regular basis?A. Check vacuum pump for any leaks.B. Check recovery device for refrigerant leaks.C. Check amperage draw of recovery device.D. Check amperage draw of vacuum pump.

B. Check recovery device for refrigerant leaks.

When a pungent odor is detected during a sealed system recovery and/or repair which of the following ismost likely?A. The refrigerant should not be recovered.B. A compressor burnout has occurred.C. It is the characteristic smell of the refrigerant.D. The refrigerant should be vented.

B. A compressor burnout has occurred.

After recovering refrigerant from a sealed system, if nitrogen is used to pressurize or blow debris out ofthe system, the nitrogen;A. must be recovered. €:B. may be vented to the ambient air.C. should be returned to the cylinder.D. should only be used if mixed with R-22

B. may be vented to the ambient air

Which refrigerants can be mixed in an appliance?A. R-22 and R-407CB. R-12 and R-134aC. R-407C and R-410AD. Refrigerants cannot be mixed

D. Refrigerants cannot be mixed

What acids can CFC and HCFC refrigerants decompose into at high temperatures (e.g. open flames,glowing metal surfaces, etc.)?A. Boric and chromic acidsB. Sulfuric and phosphoric acidsC. Hydrochloric and hydrofluoric acidsD. Phosphoric and dodecylbenzenesulfonic acid

C. Hydrochloric and hydrofluoric acids

What gases can CFC and HCFC refrigerants decompose into at high temperatures, (e.g., open flames,glowing metal surfaces, etc.)?A. Hydrazine gasB. Phosgene gasC. Helium gasD. Tetraethyl gas

A very large refrigerant leak can cause suffocation because refrigerants;A. smell strong and make breathing difficult.B. are lighter than air and cause dizziness.C. are heavier than air and displace oxygen.D. sting the nose and cause sneezing.

C. are heavier than air and displace oxygen

Permanent safety markings are NOT required on which of the following areas on household refrigeratorsusing HC refrigerants?A. On or near any evaporators and near any exposed refrigerant tubing.B. Near the machine compartment.C. On the inside ofthe refrigerator door.D. On the exterior of the refrigerator.

C. On the inside of the refrigerator door.