Which of the following refrigerants are phased-out due to Montreal protocol on ozone layer depletion-

• R11

• R21

• R12

• R32

The ozone layer filters out most of the sun’s harmful

• Infrared Radiation

• Ultraviolet Radiation

• Gamma Radiation

• Alpha Radiation

The reduction of ozone in the stratosphere could cause

• An increase in skin cancer and eye cataracts.

• An increase in plant life growth

• An increase in the earth’s polar ice

• An increase in marine life growth

If the required charge level of refrigerant for and MVAC system is 40 ounces, which of these is the correct charge level measured in pounds?

• 1.75lb

• 4.50lb

• 3.75lb

• 2.50lb

Which of the following refrigerants is a CFC-type refrigerant?

• R-22

• R-123

• R-134a

• R-12

Which of the following refrigerants is considered an HFC-type of refrigerant?

• R-134a

• R-12

• R-22

• R-11

Which type of refrigerant has the highest Ozone Depletion Potential (ODP)?

• HFC

• HCFC

• CFC

• All have the same ODP.

The abbreviation for refrigerants containing chlorine, fluorine, carbon, and hydrogen is ____.

• HFC

• HCFC

• CFC

• HFAC

To remove the refrigerant from a system without any testing or processing and to be put back into the same system is called ____.

• recovery

• renew

• reclaim

• recycle

Refrigerants that are made up of two refrigerants that, when blended in the right proportions, combine to make a third stable refrigerant, are called ____.

• blends

• azeotropes

• near azeotropes

• mixtures