EPA Refrigerant Recovery Certification Sample Questions

Core:

1. If a system will not hold a vacuum after it has been evacuated:

A. the system is ready to be charged with refrigerantB. the metering device is restrictedC. there could be a leak in the systemD. a deep enough vacuum has been pulled

2. Service technicians who violate the EPA Clean Air Act:

A. may be finedB. may be required to appear in Federal CourtC. may lose their certificationD. all of the above

3. Which of the following is a violation of the Clean Air Act?

A. venting refrigerantsB. failing to evacuate appliances before disposalC. failing to keep records or falsifying reportsD. all of the above

4. Ozone depletion is considered to be a ________ problem.

A. globalB. nationalC. regionalD. local

5. Recovery equipment that relies on the refrigeration system compressor or refrigeration system pressure would be classified as:

A. self-containedB. system dependentC. inefficient equipmentD. vacuum pump assisted

1

6. Which refrigerant does not contain chlorine?

A. R-12B. R-22C. R-134aD. R-500

7. Ozone in the stratosphere contains:

A. molecules made up of 3 oxygen atomsB. molecules made up of 100 oxygen atomsC. pollutants from earthD. molecules of chlorine atoms

8. All devices used for refrigerant recovery must:

A. have reciprocating compressorsB. meet EPA standardsC. have rotary compressorsD. have a built-in storage tank for refrigerant

9. Blended refrigerants leak from a system:

A. all the time due to their chemical make-upB. at uneven rates due to various vapor pressuresC. only in a liquid formD. slower than HFC refrigerants

10. The refrigerants that have the highest ODP are:

A. HFCsB. blendsC. CFCsD. HCFCs

2

Type I:

1. The EPA definition of a small appliance is:

A. Equipment charged with less than 5lbs of refrigerantB. Equipment manufactured, charged and hermetically

sealed in a factoryC. Equipment that has a fractional horsepower compressorD. Both A and B

2. When installing an access valve on a refrigeration system:

A. there is no need to leak test the fittingB. you should test the fitting before proceeding with servicing

the systemC. it should only be installed on the high side of the systemD. only permanent access valves can be used

3. When servicing a Type I appliance:

A. all leaks must be repairedB. it is not mandatory to repair leaksC. leak repair is required only if the system is leaking half of

is charge in 24 hoursD. none of the above

4. When using piercing valves, they should generally be installed on:

A. steel tubingB. aluminum tubingC. copper tubingD. tubing more than 5/16” in diameter

3

5. When servicing a refrigerator with a non-operating compressor, both high and low side access valves should be installed to facilitate recovery because:

A. without both sides accessed, required recovery efficiency may not be obtained

B. the recovery process may be accomplished in less time than if one access valve is used

C. liquid refrigerant may escapeD. both A and B

6. At high temperatures such as an open flame, R-12 and R-22 can decompose to form:

A. phosgene gasB. hydrochloric and hydrofluoric acidC. an inert gasD. both A and B

7. If, when servicing a system, you note a pungent odor during the recovery process:

A. refrigerant has been mixed in the systemB. a compressor burn-out has likely occurredC. a filter drier is restrictedD. there is a leak in the evaporator coil

8. EPA regulations:

A. allow for the mixing of R-12 and R-134aB. does not allow for any mixing of refrigerantsC. allow for the mixing of R-12 and R-500D. allow for the mixing of R-134a and R-410a

9. Nitrogen, when used to pressurize a system:

A. can be ventedB. can only be vented if mixed with R-22C. can be added without a pressure regulatorD. will cause coils to fail

4

10. A cylinder of R-22 sitting in a 75-degree ambient should have a pressure of:

A. 75 PSIGB. 130 PSIGC. 210 PSIGD. 40 PSIG

5

Type II:

1. The EPA considers a major repair to a refrigeration system to be:

A. replacement of a TEVB. replacement of a filter drierC. replacement of an access valveD. replacement of an evaporator coil

2. Before releasing the charge in the condensing unit throughout a split system, you should:

A. test for leaks with nitrogenB. test for leaks with some of the system’s refrigerantC. test for leaks with a less expensive refrigerantD. test for leaks with a mixture of R-12 and nitrogen

3. With an air-cooled condenser on the roof of a building and the evaporator located below, you should start recovery:

A. at the liquid line entering the evaporatorB. at the discharge line of the compressorC. at the suction side of the compressor onlyD. on the vapor side of the condenser coil

4. When inspecting a system for leaks, look for:

A. liquid refrigerant near the condenserB. traces of oilC. loose metering device connectionsD. a frosted suction line

5. If a system has not been properly evacuated or service, and there are non-condensibles in the system:

A. the system will operate more efficientlyB. the low side pressure will be lower than normalC. the high side pressure will be higher than normalD. the high side pressure will be lower than normal

6

6. Refrigerant should be removed from the condenser outlet when:

A. the suction line is kinkedB. the filter-drier is restrictedC. the condenser is below the receiverD. the evaporator coil is oil-logged

7. Equipment room refrigerant monitors are required under ASHRAE Standard 15 for:

A. R-134aB. R-22C. R-12D. all of the above

8. Recovery equipment manufactured after November 15, 1993, when used to evacuate equipment containing more than 200 lbs of refrigerant, must be able to reach:

A. 15 inches of vacuumB. 10 inches of vacuumC. 0 PSIGD. 4 inches of vacuum

9. Refrigeration systems are protected by:

A. both high and low pressure switchesB. oil-pressure safety switchesC. a pressure relief deviceD. oil sensors

10. Leaks in a comfort cooling system containing more than 50 pounds of refrigerant must be repaired when the leak rate exceeds:

A. 35 percent of the chargeB. 15 percent of the chargeC. 50 percent of the chargeD. 5 percent of the charge

7

Type III:

1. EPA regulations require that leaking industrial process refrigeration systems containing more than 50 pounds of refrigerant when the leak rate exceeds _____ percent of the charge per year.

A. 35B. 15C. 10D. 5

2. When leak-testing low-pressure centrifugal systems with nitrogen, pressurize to a maximum of :

A. 100 PSIGB. 200 PSIGC. 10 PSIGD. 20 PSIG

3. What is the primary purpose of a purge unit on a chiller system?

A. to remove refrigerantsB. to remove non-condensibles from the systemC. to remove oilD. to keep the suction side above 10 PSIG

4. The rupture disc on a centrifugal chiller is connected to:

A. the compressor discharge lineB. the evaporatorC. the condenserD. the purge unit

5. ASHRAE Standard 15-94 rates refrigerants according to flammability and toxicity. R-123 is rated as:

8

A. A-1B. A-3C. B-1D. B-3

6. EPA regulations state that equipment need not be evacuated to prescribed levels if:

A. the equipment is being scrappedB. leaks make complete evacuation impossibleC. a filter drier is replacedD. the system is restricted

7. When servicing Type III equipment the EPA requires that recovery equipment manufactured before November 15th 1993 be capable of evacuating to what level?

A. 25” HgB. 15” HgC. 25 mm HgD. 5” Hg

8. After reaching the required level of vacuum during the evacuation process, recommended procedure would be to:

A. begin charging immediately with liquid refrigerantB. wait a few minutes to check for rising pressureC. sweep charge the system on all types of equipmentD. break the vacuum with vapor before charging with liquid

9. When working on low-pressure chillers, the best method to use for raising the refrigerant pressure in preparation for service would be to:

9

A. attach an air compressor to the purge unitB. add nitrogen to the charge to increase pressure C. heat the entire equipment room to a higher levelD. use warming blankets to raise the refrigerant temperature

10. When recovering refrigerant from a system, you should begin by removing:

A. liquidB. vaporC. oilD. moisture

10