NEW EPA 608 EXAM PRACTICE QUESTIONS 2025 UPDATED

NEW EPA 608 EXAM PRACTICE
QUESTIONS 2025 UPDATED
Ozone depletion is caused by _______ in HFC refrigerants. - CORRECT
ANSWER>>>>chlorine

CFCs and HCFCs ________ making them capable capable of reaching the stratospheric ozone
layer. - CORRECT ANSWER>>>>do not dissolve in water or easily break down in the
atmosphere

According to the Rolanda-Molina theory, ________ are destroyed by each chlorine atom in the
stratosphere. - CORRECT ANSWER>>>>100,000 ozone molecules

The stratospheric ozone layer protects us from _______. - CORRECT ANSWER>>>>ultraviolet
radiation from the sun

Which health effect increases from loss of the stratospheric ozone layer? - CORRECT
ANSWER>>>>cases of cataracts or skin cancer

What proves that HCFCs are in the stratosphere? - CORRECT ANSWER>>>>HCFCs found in
air samples from the stratosphere.

What makes HFC refrigerants damaging to the environment? - CORRECT ANSWER>>>>They
can have very high global warming potentials.

_______ makes HFO refrigerants less flammable than HC refrigerants. - CORRECT
ANSWER>>>>Flourine

Which refrigerant contains chlorine? - CORRECT ANSWER>>>>R-12

HFO refrigerants are miscible in _______ lubricants. - CORRECT ANSWER>>>>POE
lubricants

An example of HcFC refrigerant is: ______ - CORRECT ANSWER>>>>R-123

What is being done in the U.S. to stop damage to the stratospheric ozone layer? - CORRECT
ANSWER>>>>Eliminating the use of CFCs and HCFCs refrigerants

EPA regulations require appliances to have _________. - CORRECT ANSWER>>>>a service
aperture or process hub

The release of any CFC, HCFC, or HFC refrigerant during _________ is illegal. - CORRECT
ANSWER>>>>theft of equipment

____________ is the only EPA SNAP approved "drop in" replacement for

, R-22. - CORRECT ANSWER>>>>There are no direct drop-in refrigerant substitutes

Ester-based oils like POE can be mixed with ________. - CORRECT ANSWER>>>>no other
oils

What provides the cooling in a vapor compression refrigeration system? - CORRECT
ANSWER>>>>The vaporization of the liquid refrigerant

An oil sample might be taken when __________. - CORRECT ANSWER>>>>a. moisture
and/or acid problems are suspected
b. oil sludge formation or oil waxing is suspected
c. residual acidic oil from a burn-out is suspected of contaminating the replacement oil

________ returns refrigerant to new product specifications and requires chemical analysis to
verify the purity to AHRI-700 standards. - CORRECT ANSWER>>>>reclaiming

The EPA considers _________ the most effective for locating the general area of a small leak. -
CORRECT ANSWER>>>>electronic or ultrasonic tester

Low ambient temperatures __________ recovery time. - CORRECT ANSWER>>>>increase

A system is considered dehydrated when _________. - CORRECT ANSWER>>>>a micron
gauge shows you have reached and held a vacuum of 500 microns or less with the vacuum pump
isolated from the system

If corrosion is discovered in the body of a relief valve, the valve must be _______. - CORRECT
ANSWER>>>>replaced

The fill level of a recovery cylinder can be determined by __________. - CORRECT
ANSWER>>>>a. mechanical-float or electronic shut-off devices
b. the weight of the cylinder

Before recharging any flammable hydrocarbon or HFO refrigerant, always ___________. -
CORRECT ANSWER>>>>a. electronically ground the recovery machine and recovery tank,
and verify the refrigeration system is grounded
b. install a fresh filter drier, successfully complete a
standing-pressure leak

A small appliance is defined as a system that is __________. - CORRECT
ANSWER>>>>manufactured, fully charged, and hermetically sealed in a factory with a charge
of 5 pounds or less

__________ is an approved refrigerant for new household refrigerators, freezers, and
combination refrigeration/freezers. - CORRECT ANSWER>>>>R-600a