epa 608 universal

Refrigeration technicians who violate the Clean Air Act can: -

Lose their EPA certification, be fined, be required to appear in Federal court.

After 1995, any supplies of CFC refrigerants to service existing units in the USA can only come from: -

recovery and recycling.

Refrigerant that is recovered can be returned to: -

the same system or other systems owned by the same person without restriction.

Refrigerant can not be called "reclaimed" unless it: - .

has been chemically analyzed and the refrigerant meets the ARI-700 standard.

The EPA can require a technician to demonstrate their ability to perform proper procedures for recovering and/or recycling refrigerant. Failure to demonstrate competency can result in: -

revocation of the technicians certification.

What characteristic(s) of CFCs make them more likely to reach the stratosphere than most other compounds containing chlorine? -

Refrigerants that contain chlorine but not hydrogen are so stable that they do not break down in the lower atmosphere after being released. The chlorine or bromine reacts with the ozone, causing it to change back to oxygen, thus destroying the ozone layer.

A system is considered dehydrated when: -

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

Disposable refrigerant containers are used for ______

virgin refrigerant

Which refrigerant is an HCFC? -

R-123, R-124, R-22

What statement is true about an azeotropic refrigerant mixture? -

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

Chlorofluorocarbos (CFCs) and hydrochlorofluorocarbons (HCFCs) have which of the following in common? -

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

To scrap a disposable cylinder, the internal cylinder pressure should be reduced to at least: -

0 psig.

Manifold gauge sets are often color coded, when this is done, the high pressure gauge is color coded: - Red.

In general, blended refrigerants should be charged: -

as a liquid.

Blended refrigerants leak from a system: -

in uneven amounts due to different vapor pressures.

Which of the following gases help form the earth's protective shield? - Stratospheric Ozone

In a refrigerant system, the device that changes a low pressure vapor to a high pressure vapor is the: - compressor.

Data shows that chlorine in the stratosphere comes mainly from CFCs rather than from natural sources such as volcanoes because: - 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;

Which atom of the CFC molecule causes ozone depletion? - chlorine

The ozone layer protects the earth from: - ultraviolet radiation from the sun.

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

An award of up to what amount may be paid to a person supplying information that leads to a penalty against a technician who is intentionally venting? - 10,000

The Montreal Protocol is: - a treaty among nations that controls production of CFCs and HCFCs.

Which refrigerant is an HCFC? - R-123, R-22, R-124

What is one of the most serious results of damage to the ozone layer? - increases in human skin cancer

Of the refrigerants listed below, which has the lowest ozone depletion potential (ODP)? - R-22

To determine the maximum allowable pressure to use when checking a system, check: - the design pressure on the equipment nameplate

Ozone depletion potential, or "ODP," is: - A measure of the ability of CFCs and HCFCs to destroy ozone.

An example of an HFC refrigerant is: - R-134a

Whenever dry nitrogen from a portable cylinder is connected to a system, what item is of most importance in consideration of safety? - There is relief in the downstream line from the pressure regulator.

During servicing of a refrigeration system containing R-12, the refrigerant must be: - recovered.

Which safety precaution(s) should always be followed: - Never apply an open flame to a refrigerant cylinder; never cut or weld any refrigerant line when refrigerant is in the line; never use oxygen to purge lines or to pressurize a system.

In a vapor compression refrigeration system, cooling occurs when: - refrigerant liquid turns to a vapor.

The evacuation of a system is a method of: - dehydration.

Each chlorine atom in the stratosphere can destroy____ozone molecules. - 100,000

An example of a HFC refrigerant is: - R-410A

Which gas(es) would cause the LEAST damage to the environment during a leak check? - dry nitrogen

Refrigerant migrates to the compressor crankcase because of a difference in______between the refrigerant and the oil. - vapor pressure.

Which refrigerant is an HCFC? - R-22, R-123, R-124

It is important not to mix R-22 and R-410A refrigerants in the same container because: - the mixture may be impossible to reclaim.

When using recover unit, the fill level of the recovery tank can be controlled by: - a mechanical switch; an electronic shut-off device; weight

Which of the following refrigerant releases is a violation of the EPA prohibition on venting? - release of mixtures of nitrogen and refrigerant that result from adding nitrogen to a fully charged appliance to "leak-check" the appliance.

Which of the following human health effects could result from an increase in ultraviolet radiation? - an increase in cataracts cases

Never use an open flame to heat a refrigerant tank because: - it can result in venting refrigerant to the atmosphere; the tank may explode, causing serious injury to people nearby; refrigerant in the tank may decompose, forming a toxic material.

When transporting cylinders containing used refrigerant, the DOT requires that you: - attach DOT classification tags

According to ASHRAE's 1992 refrigerant safety classification which of the following designations would be the most safe? - A-1

The over-evacuation of a system: - does not occur.

Equipment covered by EPA regulations include: - all air-conditioning and refrigeration equipment using CFC, HCFC or HFC refrigerants.

Never overfill refrigerant storage cylinders because: - the internal pressure of the cylinders may rise in heated areas and cause an explosion.

It is important not to mix different refrigerants in the same container because: - the mixture may be impossible to reclaim.

Manifold gauge sets are often color coded, when this is done, the low pressure gauge is color coded: - blue.

All devices used for a refrigerant recovery must: - Meet EPA standards

Reusable refrigerant containers that are normally under any pressure above 15 pig must be hydrostatically tested and date stamped every: - 5 Years

Which refrigerant(s) must be recovered before opening a system or disposing of a system? - all refrigerants must be recovered.

To obtain an accurate vacuum readings during system evacuation, the system vacuum gauge should be located: - as far from the vacuum pump as possible.

What is the best proof that CFCs are in the stratosphere? - measurements of CFCs in air samples from the stratosphere

The recovery of refrigerants is necessary to: - maintain adequate supplies for service calls after the production bans; prevent the venting of refrigerants to the atmosphere; prevent stratospheric ozone depletion

An example of an HFC refrigerant is: - R-410A

A compound pressure gauge, typically used on the low side of the system, measures pressure in: - psig and inches of mercury

______________refers to the process of cleaning refrigerant by oil separation and single or multiple passes through filter-driers, which reduce moisture and acidity? - Recycling

The high pressure gauge on service manifold sets has a continuous scale, usually calibrated to read from: - 0 to 500 psi

_________is the process that returns refrigerant to new-product specifications and that requires chemical analysis? - Reclaim

A cylinder with a gray body and a yellow top indicates that the cylinder is designed to hold: - recovered refrigerant

HFC refrigerants: - are less harmful to stratospheric ozone than CFCs

Which type of refrigerant is the most harmful to stratospheric ozone? - Refrigerants containing Bromine

According to the EPA, a_______ leak detection method is considered to be the most effective for locating the general area of a small leak. - electronic or ultrasonic tester

Long hoses between the unit and the recovery machine should not be used because they cause: - excessive pressure drop; increased recovery time; increased emissions

Recovery equipment that relies upon the compressor in the system would be considered: - system-dependent.

A hermetic compressor must never be operated when: - there is a dehydration vacuum in the system.

"Self-contained" recovery devices: - can capture liquid and/or vapor refrigerant without the assistance of components in the air-conditioning or refrigeration equipment.

Systems charged with R-410A should be leak checked with: - pressurized nitrogen.

R-410A is not a typical blended refrigerant because: - It is near azeotropic refrigerant; it can be charged as either a liquid or vapor; while it has a 400 series refrigerant number it behaves like a 500 series refrigerant

A ternary refrigerant blend is a _______ part mixture. - three-part

In a refrigeration system, high pressure vapor is converted to high pressure liquid in the: - condenser.

Which of the following is an approved "drop-in" service replacement for r-12? - According to the EPA there are no "drop-in" replacements

The proper method of discarding a disposable refrigerant cylinder is to: - assure that all refrigerant is recovered and that the cylinder is rendered useless, then recycle the metal.

CFC refrigerants are so named because they contain the elements: - Chlorine, fluorine, carbon

Before you dispose of any system containing a refrigerant, you must: - recover the refrigerant.

According to EPA regulations, which of the following is procedures is NOT an approved technique for system cleanup after a burnout? - flushing with liquid refrigerant to clean tubing

When using nitrogen to pressurize a system, you should always: - charge though a pressure regulator.

What effects can ozone depletion have on the environment? - reduced crop yields; reduced marine life; increased ground-level ozone

Non-azeotropic refrigerants leak from a system: - in uneven amounts due to different vapor pressures.

An example of an HCFC is: - R-22

Which chemicals are controlled by the Montreal Protocol? - chlorofluorocarbons, hydrochlorofluorocarbons, halons

Systems charged with R-134a should be leak checked with: - pressurized nitrogen.

When evacuating a system, the hoses should be: - equal to or larger than vacuum pump inlet connection.

It has been illegal to vent substitutes for CFC and HCFC refrigerants since: - November 1995

Never use oxygen or compressed air to pressurize a system because: - when mixed with compressor oil or some refrigerants, it could explode.

Refrigerant cylinders should always be: - free of rust and damage; color coded to indicate the contents; secure

Even though R-22 is considered non-toxic, it: - can cause asphyxia.

A system is dehydrated to: - remove water and water vapor.

According to the EPA, of the refrigerants liked below, which types of refrigerants will not contribute to Global Warming? - CFCs HCFCs HFCs all contribute to Global Warming

The type of oil that is most commonly used in stationary air conditioning applications with HFC-410A refrigerant is: - ester oil.

Technicians receiving a passing grade on the Type II (medium-pressure, high-pressure and very high pressure) exam are certified to recover refrigerant during the maintenance, service, or repair of medium- and high-pressure equipment and very high pressure refrigerants, including: - With Type II certification, you are certified for all very high pressure refrigerants including CFC-13 and CFC-503

PPE(gloves, safety glasses, safety shoes, etc.) should always be worn is when: - handling and filling refrigerant cylinders.

Refrigerant vapors or mist should not be inhaled because - they may cause heart irregularities and/or unconsciousness.

Violations of the Clean Air Act? - falsifying or failing to keep required records; failing to reach required evacuation levels before opening or disposing of appliances; knowingly releasing CFC or HCFC refrigerants or their substitutes while repairing appliances.

HFC refrigerants contain: - hydrogen, fluorine, carbon

Which refrigerant contains an HCFC? - R-22

Recovery equipment that relies upon the pressure of the refrigerant in the appliance would be considered: - System-dependent