A refrigerator helps keep food from going bad at the house or the office. To be able to fix a refrigerator ensure you give it to someone certified to work on refrigerators. Are you working to get that certificate? The test below is designed to jolt your memory on refrigerator pumps. Good luck in the exams.
Carbon dioxide
Acid
Carbon monoxide
All of the above
10 psia
5" Hg VAC
5 psig
1000 microns
Raise the pressure in a refrigeration system
Lower the pressure in a refrigeration system below atmospheric
Allow refrigerant to escape into the atmosphere
Condense the gas in the system
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
Atmospheric pressures at high altitudes
Atmospheric pressures at sea level
Absolute pressures below 1 mm Hg
High pressure in a refrigeration system
In a vacuum
Open to the atmosphere
Operation with all fans activated
Standing with dry nitrogen pressure of 150 psig in the system
Are desirable in a refrigeration system
Are undesirable in a refrigeration system
Condense readily under normal atmospheric conditions
Help in pulling a vacuum
Compound gauge
Mercury "U" tube manometer
Mercury barometer
Electronic vacuum gauge
Light flexible hose
Heavy duty rubber gauge line
Copper tube
Garden hose
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
Vaporized
Condensed
Cooled
Solidified
10
1
100
10,000
R-22
R-123
R-134a
R-12
R-12
R-402
R-22
R-134a
R-134a
R-12
R-22
R-11
HFC
HCFC
CFC
All have the same ODP.
Increased ground level ozone (smog)
Reduced marine life
Reduced crop fields
All of the above
HFC
HCFC
CFC
HFAC
HFC
HCFC
CFC
HFAC
HFC
HCFC
CFC
HFAC
Recovery
Renew
Reclaim
Recycle
Recovery
Renew
Reclaim
Recycle
Recovery
Renew
Reclaim
Recycle
Blends
Azeotropes
Near azeotropes
Mixtures
0.8
0.016
0.05
1.0
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