The EPA requires that all comfort cooling systems with more than 50 lb of refrigerant be repaired when the annual leak rate exceeds _________ :

Trace amounts of R22 can be used for carrying out pressure test in a refrigeration system:

Refrigerants built before 1950 often contains which of the following:

If a leak in an appliance makes the prescribed evacuation level unattainable, the appliance can be evacuated to ________ :

Before transferring refrigerant into an empty refrigerant cylinder, the cylinder must be:

The liquid receiver is part of the low side of the refrigeration system:

The high pressure will not be dropped back to low pressure until refrigerant pass through:

Moisture indicating sight glass is located upstream of the which of the following:

Which of the following is sprayed to remove the ice formation on the liquid line sight glass

Heating the oil reduces the amount of refrigerant in the lubricating oil

Which one of the following is not a hermetic compressors that is used most often:

The _______ is installed to prevent any transient slugs of liquid from entering the compressor:

If the sight glass is covered with ice which of the following is used to remove the ice:

If Recovery or Recycling equipment was manufactured before 15 Nov 1993, Inches of Vacuum that Recovery or Recycling Equipment Must Achieve from a  High-Pressure Appliance (R-13, R-23, R-503) is:

If a moisture indicating sight glass is used in a refrigeration system, it would be located _______ of the filter drier