EPA 608 CORE – Practice Test 1

The proper answer is D:  All of the above.

Refrigeration technicians who violate the Clean Air Act can lose their EPA certification, be fined, and also be required to appear in Federal court.

Correct answer is A:  recovery and recycling.

After 1995 supplies of CFC refrigerants used to service existing refrigeration appliances in the United States can only come from recovery and recycling.

The correct answer is A:  returned to the same system and other systems owned by the same person without restriction.

Refrigerants that are recovered can be returned to the same system and other systems owned by the same person without restriction. 

The correct answer is B:  have been chemically analyzed and the refrigerants meet the ARI-700 purity standard.

Refrigerants cannot be called “reclaimed” unless they have been chemically analyzed and the refrigerants meet the ARI-700 purity standard.

The correct answer is A:  revocation of the technicians certification.

The EPA can require a technician to demonstrate the abilities to perform proper procedures for recovering and/or recycling refrigerant. Failure to demonstrate competency can result in revocation of the technicians certification.

The correct answer is A:  Refrigerants such as CFCs that contain chlorine but not hydrogen are so stable that they do not break down in the lower atmosphere. The chlorine (or bromine) only breaks down when it reacts with the ozone molecules up higher in the stratosphere changing it to oxygen, thus breaking the ozone layer down.

The characteristic of CFC refrigerants that make them more likely to reach the stratosphere than most other compounds that contain chlorine is that refrigerants such as CFCs that contain chlorine but not hydrogen are so stable that they do not break down in the lower atmosphere. The chlorine (or bromine) only breaks down when it reacts with the ozone molecules up higher in the stratosphere changing it to oxygen, thus breaking the ozone layer down.

The correct answer is A:  the vacuum indicator shows you have reached and held the required vacuum.

A system is considered dehydrated when the vacuum indicator shows you have reached and held the required vacuum.

The correct answer is C:  virgin/new

Disposable refrigerant containers are used for virgin/new refrigerants.

The correct answer is A:  R-124

R-124 is an HCFC refrigerant.

The correct answer is D:  It is a mixture that acts like a single component refrigerant over its entire range.

An azeotrope refrigerant mixture acts like a single component refrigerant over its entire range.

The correct answer is D:  They both must be recovered before opening appliances for servicing or disposing of them.

Chlorofluorocarbon (CFC) and hydrofluorocarbon (HCFC) refrigerants both must be recovered before opening appliances for servicing or disposing of them.

The correct answer is A:  0 psig

When scrapping a disposable refrigerant cylinder, the internal cylinder pressure should be reduced to at least 0 psig.

The correct answer is C:  red.

Manifold gauge sets are usually color coded. When this is so, the high pressure gauge is red.

Correct answer is C: as a liquid.

Generally, blended refrigerants should be charged as a liquid.

Correct answer is B:  in uneven amounts due to to the different vapor pressures of its blends.

Blended refrigerants leak from a system in uneven amounts due to to the different vapor pressures of its blends.

Correct answer is C:  Stratospheric Ozone

Which of the following gases help form a protective shield for the earth? Stratospheric Ozone.

Correct answer is C:  compressor

In a refrigeration system, the component that changes low-pressure vapor to high-pressure vapor is the compressor.

Correct answer is D:  All the above.

Research and data show that chlorine in the stratosphere mainly comes from man-made CFC’s rather than natural sources such as volcanoes because:

• A. The rise in the amount of chlorine in the stratosphere matches the rise in the amount of fluorine, which has different natural sources than chlorine.
• B.  The rise in the amount of chlorine in the stratosphere matches the rise in CFC emissions.
• C.  Air samples taken from the stratosphere over erupting volcanoes show that volcanoes contribute a small quantity of chlorine to the stratosphere when compared to CFCs.

Correct answer is B:  Chlorine

Which atom in CFC molecules causes ozone depletion?  Chlorine

Correct answer is C:  ultraviolet radiation from the sun.

The ozone layer in the stratosphere protects the earth from ultraviolet radiation from the sun.

Correct answer id C:  the material safety data sheets.

When using any cleaner, solvent, chemical, or refrigerant, you should review the material safety data sheets.

Correct answer is B:  $10,000

A reward of up to $10,000 may be given to a person supplying information that leads to a penalty against a technician intentionally venting refrigerants into the atmosphere.

Correct answer is D:  a multi-national treaty that controls the production of CFC and HCFC refrigerants.

The Montreal Protocol is a multi-national treaty that controls the production of CFC and HCFC refrigerants. 

Correct answer is A:  R-123

Which of the following refrigerants is an HCFC?  R-123

Correct answer is C:  An increase in the rate of human skin cancers.

What is one of the most serious consequences of damaging the earths protective layer of ozone?  An increase in the rate of human skin cancers.