Exam 1: Heating and Air Conditioning - History and the Environment

Technician A says chlorine in CFC-12 (R-12)refrigerant may destroy ozone molecules for over a century.Technician B says O₃ is destroyed and created by UV radiation.Who is correct?

In the greenhouse effect what type of radiation is re-emitted by the earth's surface and is absorbed and reflected by greenhouse gas molecules in the atmosphere warming the earth's surface and lower atmosphere?

George H.W.Bush signed the Clean Air Act ammendment of 1990 into law that placed strict regulations on CFC emissions.

Technician A says a refrigerant service cylinder should have a pressure relief valve.Technician B says a fusible plug gives excellent protection between 160°F and 180°F.Who is correct?

What is the greenhouse effect?

Technician A says CFC-12 (R-12)is no longer being manufactured in the United States.Technician B says CFC-12 (R-12)refrigerant can still be sold.Who is correct?

What does Title 6 of the Clean Air Act cover?

List four major components of chlorofluorocarbons (CFCs,freon,and halons).

What should the technician do before loosening bolts or screws on a refrigeration system?

How many ozone molecules can be destroyed by a single molecule of chlorine?

Automotive technicians who service mobile air conditioning systems must be certified by an EPA-approved testing agency.

What does EPA stand for?

Chlorofluorocarbons are being discussed.Technician A says CFC's production and use is strictly regulated by the Clean Air Act.Technician B says chlorofluorocarbons are an artificially made chemical.Who is correct?

The most common gas in the earth's atmosphere is oxygen.

What does the term ozone hole refer to?

Technician A says UV radiation inhibits the human body's immune system and causes skin tissue damage.Technician B says the release of CFCs into the atmosphere could help decrease the greenhouse effect.Who is correct?

Ozone has the same chemical properties as carbon monoxide.

What is the common name or number used for the hydro-fluorocarbon (HFC)refrigerant used in automotive refrigerant systems today?

Technician A says ozone is both created and destroyed by the action of UV radiation on oxygen molecules.Technician B says chlorine is the major gas causing the destruction of ozone.Who is correct?

On January 1,2011 the European Union EU 2006/40/EC Act provisions went into effect.What impact does this act have on refrigerant systems?