Refrigerants review 2 Quiz

Air entering a refrigerant system can eventually lead to compressor failure.

• True

• False

Moisture in a liquid state must be ____ before it can be removed with a vacuum pump.

• vaporized

• condensed

• cooled

• solidified

Tags

NGSS.HS-PS3-4

A micron gauge is used to measure ____.

• atmospheric pressures at high altitudes

• atmospheric pressures at sea level

• absolute pressures below 1 mm Hg

• high pressure in a refrigeration system

A multiple evacuation means that ____.

• you connect three vacuum pumps simultaneously to a refrigeration system and pull a vacuum

• you pull a vacuum on three different systems at the same time

• you pull a vacuum on a refrigeration system more than once, allowing refrigerant or nitrogen into the system between each procedure

• there must be more than one system operating before a vacuum can be pulled

The maximum recommended pressure for leak testing is 150 psig on the low-pressure side of the system.

• True

• False

Noncondensable gases ____.

• are desirable in a refrigeration system

• are undesirable in a refrigeration system

• condense readily under normal atmospheric conditions

• help in pulling a vacuum

To insure accurate testing, the best material to use for connecting lines to the vacuum pump and gauge set is ____.

• light flexible hose

• heavy duty rubber gauge line

• copper tube

• garden hose

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

• carbon dioxide

• acid

• carbon monoxide

• carbolic acid

Clearance tolerances are such that the ordinary clean refrigerant oil can be used satisfactorily in a vacuum pump.

• True

• False

A compound gauge ____.

• indicates pressures above 14.696 psia

• indicates pressures in inches Hg below atmospheric pressure

• is one of two gauges on a typical gauge manifold

• All of the above.