Core Section A (General Knowledge)

CFCs will no longer be manufactured or imported into the US after:

1995

Under EPA's regulations, what standard must reclaimed refrigerant meet before it can be resold?

ARE 700

Disposing of disposable cylinders is accomplished by:

Assuring that all refrigerant is recovered and that the cylinders are rendered useless, then recycling the metal.

Recycle

Clean refrigerant for reuse by separating the oil from the refrigerant and removing moisture from the refrigerant by passing it through one or more filter driers.

What is the most effective leak detection method for locating the general area of a small leak?

Electronic or ultrasonic tester

Vacuum line (hoses) should be:

Equal to or larger than pump intake connection?

Ozone depletion in the stratosphere is what type of problem?

Global

Hydrochlorofluorocarbons (HCFC) refrigerants contain:

Hydrogen, chlorine, fluorine, and carbon

What is one of the most serious results of damage to the ozone layer?

Increases in human skin cancer

The state of refrigerant entering the compressor of a refrigeration system is?

Low pressure vapor

Service technicians who violate clean air act provisions:

May be fined May lose certification May be required to appear in federal court

All devices used for refrigerant recovery must:

Meet EPA standards.

A compound pressure gauge for the low side of the system measure pressure in:

Psig and inches of me cry (Hg)

An example of a CFC refrigerant is:

R-12

Which refrigerant(s) must be recovered before opening or disposing of appliances?

R-12,22,500

Which of the following refrigerants has the lowest ozone depletion potential?

R-134a

What is an approved "drop-in" service replacement for R-12?

R-134a by following appropriate retrofit procedures.

A refrigerant cylinder that has a grey body and a yellow top indicates the cylinder is designed to hold:

Recovered refrigerant.

What gases help form the earth's protective shield:

Stratospheric ozone

Chlorine in the stratosphere is believed to come primarily from CFCs rather than from natural sources such as volcanos because:

The rise in the amount of chlorine measured in the stratosphere over the past two decades matches the rise in the amount of fluorine, which has different natural sources than chlorine, over the same period. The rise in the amount of chlorine measured in the stratosphere over the past two decades matches the rise in CFC emissions over the same period. Samples of air taken from the stratosphere over erupting volcanos show that volcanos contribute a small quantity of chlorine to the stratosphere compared to CFCs.

Refrigerant vapors or mist in high concentrations should not be inhaled since:

They may cause heart irregularities or unconsciousness.

How should refrigerant cylinders be positioned when they are shipped?

Upright

Temperature glide

Used to describe the fact that a refrigerant blend has a range of boiling or condensing points at a constant pressure.