CORE

Generally, blended refrigerants should be charged

Deselect Answer

the same as any other refrigerant.

at very high temperatures.

as a liquid.

as a vapor.

Chlorofluorocarbon (CFC) and hydrofluorocarbon (HCFC) refrigerants have which of the following in common?

Deselect Answer

They both contain hydrogen.

They have identical ODP.

They have the same normal boiling points.

They both must be recovered before opening appliances for servicing or disposing of them.

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

Deselect Answer

$37,000

$27,000

$10,000

$5,000

Which atom in CFC molecules causes ozone depletion?

Deselect Answer

Fluorine

Chlorine

Sodium

Carbon

Refrigerants cannot be called “reclaimed” unless they

Deselect Answer

are recovered using equipment less than 1 year old.

have been chemically analyzed and the refrigerants meet the ARI-700 purity standard.

were properly processed in a reclaiming machine.

are recovered from a system in service less than 1 year and still under warranty.

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

Deselect Answer

seizure of any refrigerant purchased by the technician that they still are in possession of.

mandatory attendance at refrigeration training boot camp where they will have to run in place for 8 hours/day while holding a manifold gauge set over their head.

seizure of the technicians recovery/recycling equipment.

revocation of the technicians certification.

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

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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.

the rise in the amount of chlorine in the stratosphere matches the rise in CFC emissions.

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.

All the above

Which of the following statements is true about an azeotrope refrigerant mixture?

Deselect Answer

It is always made from just two components.

It is a mixture made from at least three different refrigerants.

It has a pressure-temperature curve identical to one of its components.

It is a mixture that acts like a single component refrigerant over its entire range.

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

Deselect Answer

yellow.

blue.

red.

green.

When using any cleaner, solvent, chemical, or refrigerant, you should review

Deselect Answer

the material safety data sheets.

the moisture solubility information.

the chemical compound reference sheet.

the chemical composition reference sheets.

Which of the following refrigerants is an HCFC?

Deselect Answer

R-134a

R-410a

R-12

R-123

A system is considered dehydrated when

Deselect Answer

the manifold suction gauge has held a 30 inch hg vacuum for 3 hours.

it asks you for a drink of water.

the vacuum pump has run at least 5 hours.

the vacuum indicator shows you have reached and held the required vacuum.

The ozone layer in the stratosphere protects the earth from

Deselect Answer

ultraviolet radiation from the sun.

infrared radiation from the sun.

the suns nuclear radiation.

the klingons from kronos.

Which of the following refrigerants is an HCFC?

Deselect Answer

R-134a

R-12

R-124

R-410a

Refrigerants that are recovered can be

Deselect Answer

used in any system serviced that day.

returned to the same system and other systems owned by the same person without restriction.

taken to the shop and sold as used refrigerants to other customers.

called reclaimed refrigerant if a filter-drier was used during recovery.

Disposable refrigerant containers are used for _________ refrigerants.

Deselect Answer

Both A and B

recovered

recycled

virgin / new

Blended refrigerants leak from a system

Deselect Answer

faster than other refrigerants.

in uneven amounts due to to the different vapor pressures of its blends.

slower than other refrigerants.

only if a system component fails.

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

Deselect Answer

Chlorine

Propane

Carbon Monoxide

Stratospheric Ozone

The Montreal Protocol is

Deselect Answer

an energy efficiency test developed by the Canadian government.

a testing procedure for measuring the amount of chlorine in the stratosphere.

a multi-national treaty that controls the production of CFC and HCFC refrigerants.

a procedure or protocol to test for ozone concentration in the atmosphere.

What characteristic of CFC refrigerants make them more likely to reach the stratosphere than most other compounds that contain chlorine?

Deselect Answer

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.

CFCs are lighter than other damaging compounds making them easier to float upward when released.

CFCs are attracted to the static in the stratosphere.

CFCs are attracted to the dust in the stratosphere.

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

Deselect Answer

TXV.

condenser.

evaporator.

compressor.

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

Deselect Answer

15 psig

0 psig

12 psig

20 psig

What is one of the most serious consequences of damaging the earths protective layer of ozone?

Deselect Answer

An increase in the rate of human skin cancers.

Marine plant mutations.

An increase in natural radioactivity.

An increase in volcanic activity.

Refrigeration technicians who violate the Clean Air Act can

Deselect Answer

lose their EPA 608 certification.

All of the above.

be required to appear in Federal court.

be fined.

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

Deselect Answer

third-world chemical companies.

European manufacturers.

recovery and recycling.

solvent conversion.

PRACTICE TEST 1

ARE YOU READY?

LET’S PRACTICE!