#5 EPA 608 CORE

Which of the following is a reason to heat a system during dehydration?

• To prevent oxidation.

• To increase oil viscosity.

• To decrease dehydration time.

• To increase dehydration time.

Which refrigerant depletes the ozone layer?

• R-717

• R-744

• R-22

• R-32

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

• Low pressure liquid

• Low pressure vapor

• High pressure liquid

• High pressure vapor

Which of the following statements is true?

• There is no difference between refrigerant grade hydrocarbon refrigerant and propane for grills.

• Propane cylinders for grilling contain impurities that can damage refrigeration equipment.

• Refrigerant-grade hydrocarbon refrigerant is of lower quality than consumer propane cylinders.

• Hydrocarbon refrigerants can be used as a retrofit refrigerant.

Why do EPA regulations require appliances to have a service aperture or process stub?

• To make it easier to recover refrigerant.

• To check for open motor windings.

• To vent non-condensibles.

• To dehydrate the system oil.

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

• Recycling

• Recovering

• Reclaiming

• Restoring

Which oil is used with most HFC refrigeration applications?

• Esters

• Alkyl-benzenes

• Mineral oil

• Any oil that is compatible with both CFC and HCFC refrigerants

An example of a CFC refrigerant is:

• R-134a

• R-123

• R-22

• R-12

What must be done before disposing of any appliance containing a CFC, HCFC, or HFC refrigerant?

• Recover the refrigerant.

• Purge the appliance with nitrogen.

• Flush the appliance with R-134a.

• Seal the appliance so no refrigerant can escape.

Ozone depletion in the stratosphere is what type of problem?

• Local

• Regional

• National

• Global