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7 Cards in this Set

  • Front
  • Back

When Moisture is present in a refrigeration system, it will react with the refrigerant and oil to form

ACIDs, Hydrofluoric, Hydrochloric

Which of the following represents the lowest vacuum?


a. 1 "Hg


b 1000 microns


c. 5,000 microns

c. 5,000 microns

To pull vacuum means to


______________________________________


a. turn on the vacuum cleaner


b. increase the pressure on a system while using the vacuum


c. Lower the pressure below atmospheric pressure in the system

C. Lower the pressure below atmospheric pressure in the system.

A compound gauge will read ______________.



a. Only above atmospheric pressure


b. compound pressure


c. above and below atmospheric pressure

c. Above and below atmospheric pressure

A Micron gauge is used to determine?



a. pressures above atmospheric


b. pressures below atmospheric


c. Thickness of a metal plate

b. pressures below atmospheric

Non condensable gases in the system will cause?



a. No problems


b. High head pressure


c. Low head pressure

b. High Head pressure

What is the most accurate instrument for checking a deep vacuum?



a. manifold gauges


b. U tube manometer


c. Digital micron gauge

c. digital micron gauge