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A deep vacuum involves reducing the pressure in a refrigeration system to a micron gauge reading of ____________________ or below.

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Micron gauge displays can be electronic analog, digital, or  ____________________.

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light-emitting diode...

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Why must all valves be opened when an evacuation is performed?

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If they are closed, ...

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Why is it a good idea to remove Schrader stems from service valves prior to evacuation?

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The Schrader valve s...

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


A) carbon dioxide
B) acid
C) carbon monoxide
D) carbolic acid

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Explain why triple evacuations are not normally performed on large systems.

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It takes t...

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To pull a vacuum means to ____.


A) raise the pressure in a refrigeration system
B) lower the pressure in a refrigeration system below atmospheric
C) allow refrigerant to escape into the atmosphere
D) condense the gas in the system

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Noncondensable gases ____.


A) are desirable in a refrigeration system
B) are undesirable in a refrigeration system
C) condense readily under normal atmospheric conditions
D) help in pulling a vacuum

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Sludge is produced when moisture, acid, and ____________________ are present in the system.

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A compound gauge ____.


A) indicates pressures above 14.696 psia
B) indicates pressures in inches Hg below atmospheric pressure
C) is one of two gauges on a typical gauge manifold
D) All of the above.

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While under a deep vacuum, any liquid water under the oil in the motor-compressor assembly can be removed by operating the compressor motor for several seconds without any adverse effect on the system.

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A micron gauge is used to measure ____.


A) atmospheric pressures at high altitudes
B) atmospheric pressures at sea level
C) absolute pressures below 1 mm Hg
D) high pressure in a refrigeration system

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Why is nitrogen considered a "noncondensable" gas?

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Nitrogen will not co...

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Showing 21 - 33 of 33

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