Refrigerant Quiz

Before you dispose of any system containing a refrigerant, you must:

• A) recover the refrigerant.

• B) purge the system with nitrogen.

• C) flush the system with R-11 or R-113.

• D) seal the system so no refrigerant can during disposal.

According to EPA regulations, which of the following is procedures is not an approved technique for system cleanup after a burnout?

• A) installing a suction-line filter-drier

• B) flushing with liquid refrigerant to clean tubing

• C) triple evacuation

• D) deep vacuum evacuation

When using nitrogen to pressurize a system, you should always:

• A) Charge nitrogen as a liquid.

• B) Charge through a pressure regulator.

• C) Pressurize to above 1000 pounds.

• D) Never use nitrogen inside the system.

What effects can ozone depletion have on the environment?

• A) reduced crop yields

• B) reduced marine life

• C) increased ground-level ozone

• D) all of the above

Non-Azeotropic refrigerants leak from a system:

• A) faster than other refrigerants.

• B) in uneven amounts due to different vapor pressures.

• C) slower than other refrigerants.

• D) only if the joint fails completely.

Which chemicals are controlled by the Montreal Protocol?

• A) chlorofluorocarbons

• B) hydrochlorofluorocarbons

• C) halons

• D) all of the above

Systems charged with R-134a should be leak checked with:

• A) CFCs.

• B) HCFCs.

• C) compressed dry air.

• D) pressurized nitrogen.

When evacuating a system, the hoses should be:

• A) orange in color for safety reasons.

• B) as long as possible.

• C) smaller than vacuum pump inlet connection.

• D) equal to or larger than vacuum pump inlet connection.

It has been illegal to vent substitutes for CFC and HCFC refrigerants since:

• A) June 1, 1992.

• B) July 15, 1993.

• C) November 1993.

• D) November 1995.

Never use oxygen or compressed air to pressurize a system because:

• A) when mixed with compressor oil or some refrigerants, it could explode.

• B) leaking oxygen or compressed air are more difficult to detect than nitrogen.

• C) the pressures produced by either oxygen or compressed air are not as good as nitrogen pressures.

• D) oxygen and compressed air do not mix with refrigerants.