EPA Core

CFCs neither dissolve in water nor break down into compounds that dissolve in water, so they do not rain out of the atmosphere

True

How many ozone molecules will one chlorine atomdestroy?

100,000

What does ODP stand for?

ozone depletion potential

What is ODP?

the measurement of CFCs and HCFCs ability to destroy ozone

Which refrigerant is the most harmful to the ozone layer?

R-12 CFC

The Clean Air Act

prohibits venting of CFCs and HCFCs as of November 14, 1994

The Clean Air Act

requires a service technician to be EPA certified as of November 14, 1994

When disposing of a refrigerant cylinder

recover the refrigerant and render the cylinder useless

When is it most likely that an appliance will need its refrigerant recovered?

before it can be discarded

What is known as de minimis releases?

It is a maximum amount of refrigerant that can be released to the atmosphere when servicing equipment

What does the term temperature glide refer to?

the different refrigerant boiling and condensing points of a blended refrigerant

Service technicians who violate the Clean Air Act

may be fined and may lose certification

How much of a fine can be issued for venting refrigerants?

$44,539

An award of _______ is given to the person who supplies information about the venting ofrefrigerants

$10,000

Fractionation is the separation of blended refrigerants caused by different refrigerant vapor pressures.

True

What is the pressure range of the high-side gauge that is located on a manifold set?

0 psig to 500 psig

Which of the following mixtures are legal to add into a system for the purpose of leak testing?

a trace amount of R-22 and nitrogen

Hygroscopic is oil that

has a high attraction to moisture

What is the state of the refrigerant leaving the condenser?

high-pressure liquid

What is the color code of refrigerant gauges?

low side is blue, high side is red

Which of the following is considered recycling?

removing, filtering, and reusing refrigerant in a system

Refrigerant cylinders should be

free of rust as well as non-dented and undamaged.

Which leak detector will help locate the general area of a system's leak?

electronic/ultrasonic

Which of the following makes it impossible to reclaim a refrigerant?

having two different refrigerants in one container

To prevent an explosion, never fill a refrigerant cylinder more than

80% full

Refrigerant can cause suffocation because

It is heavier than air and it displaces oxygen

The Montreal Protocol is

a treaty regulating the production of CFCs

What refrigerant is an HCFC?

R-22

What refrigerant is an HCFC?

R-134A

A ternary blend is

a three part blend

What type of oil does a ternary blend use?

Alkylbenzene

Which of the following is considered a "System Dependent" (passive) recovery?

using the appliance compressor to remove refrigerant

Which of the following is considered a "Self-Contained" (active) recovery?

using an EPA approved recovery machine

A mechanical float device, an electronic shutoff device, and weight methods are devices used to

safely recover refrigerants

A CFC and an HCFC have the same ozone depletion potential

False

When pressure testing a system, never exceed

low-side test pressures

Which agency has to approve refrigerant cylinders before they aretransported?

DOT

To prevent an explosion, never pressure test a system using

Oxygen

A system is evacuated to 29.92" Hg and the pump is turned off. The pressure increases and stops at 25" Hg. Whatcan be said about the system?

It has moisture or refrigerant present in the system

Ozone in the stratosphere above the earth consists of

Molecules containing 3 oxygen atoms

Which atom from the CFC molecule causes ozone depletion?

Chlorine

Ozone depletion in the stratosphere is what type of problem?

Global

What characteristic of CFC make them more likely to reach the stratosphere than mostother compounds?

CFCs neither dissolve in water nor break down into compounds that dissolve in water so theydo not rain out of the atmosphere

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

Stratospheric Ozone

What is being done in the U.S. to stop damage to the stratospheric ozone layer?

-Using natural gas instead of coal to generate electricity

-Capturing and ultimately eliminating the use of chlorofluocarbons

-Enforcing strict emissions requirements

Some state and local governments may establish laws that:

Contain stricter regulations than the Clean Air Act/EPA

Blended refrigerants leak from a system:

At an uneven rate due to different vapor pressures

R-134a refrigerant charged systems should be leak checked with

Pressurized nitrogen

The state of the refrigerant leaving the condenser of a refrigeration system is

High pressure liquid

Refrigerant entering the compressor of a refrigeration system is a

Superheated vapor

Which process applies to cleaning refrigerant for immediate reuse by oil separation and single or multiple passes through devices like replaceable core filter-dryers which reduce moisture and acidity?

Recycling

Recovery during low ambient temperatures will:

Slow the recovery process

Factors affecting the speed of evacuation include:

-the size of the equipment being evacuated

-the ambient temperature

-the amount of moisture in the system

When pressurizing a refrigeration system with nitrogen what rule should you always follow?

Charge through a pressure regulator