EPA 609 Safety & Environmental Practices 3

Question 1

Ozone in the stratosphere protects the Earth by:

Accepted Answer

Absorbing harmful ultraviolet (UV-B and UV-C) radiation

Answer

Stratospheric ozone absorbs UV-B and UV-C radiation, preventing it from reaching Earth's surface where it causes skin cancer, cataracts, and ecosystem damage.

Question 2

Chlorine atoms from CFCs destroy ozone through what type of reaction?

Accepted Answer

A catalytic chain reaction where one chlorine atom can destroy thousands of ozone molecules

Answer

A single chlorine atom acts as a catalyst and can destroy up to 100,000 ozone molecules before it is neutralized.

Question 3

The 'ozone hole' phenomenon primarily affects which region of the planet?

Accepted Answer

The Antarctic (South Pole) region

Answer

The ozone hole was first discovered over Antarctica, where polar stratospheric clouds create conditions that accelerate ozone destruction.

Question 4

What is the 'de minimis' exemption in EPA refrigerant regulations?

Accepted Answer

A very small refrigerant release unavoidable during good-faith repair work is not considered venting

Answer

The de minimis exemption recognizes that small, unavoidable refrigerant releases during normal repair operations in good faith are not violations.

Question 5

How should a technician dispose of used refrigerant oil drained from an MVAC system?

Accepted Answer

Dispose of it as hazardous waste through a licensed waste handler

Answer

Refrigerant-contaminated PAG oil is hazardous waste and must be handled by a licensed waste disposal service — it cannot be reused or dumped.

EPA 609 - EPA Section 609 Refrigerant Certification Practice Test

EPA 609 - EPA Section 609 Refrigerant Certification Practice Test

EPA 609 Safety & Environmental Practices 3