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28 Cards in this Set
- Front
- Back
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Describe Boyle’s law |
If temperature remains constant, volume changes inversely to pressure |
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Charlie’s law |
If pressure on given volume is held constant, volume changes in direct proportion to absolute temperature lus |
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Lussac’s law |
If volume is constant, pressure exerted is directly proportional to absolute pressure |
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Increase in altitude causes decrease in? |
Atmospheric pressure |
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What happens to air above sea level |
Air gets thinner |
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What happens as air gets thinner |
Pressure drops |
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Decrease in intake pressure causes what |
Decrease in power requirements |
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Moisture in a compressor causes what problems? |
Freezing. Rust Harm to lubricants |
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Reducing volume does what |
Increases pressure |
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Name two types of positive displacement compressor |
Reciprocating and rotary |
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Which positive displacement pump is most popular |
Reciprocating |
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What does the term single acting mean |
Compression happens on one side of the piston only |
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How is the suction valve opened on a reciprocating compressor |
The difference in pressure open the valve as the piston moves down |
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How was the discharge valve on reciprocating compressor opened? |
Cylinder pressure exceeds the discharge piping pressure as the piston moves up, forcing valve open |
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In a single acting air compressor how many compression strokes are there per revolution? |
One |
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In a double acting air compressor is air compressed on what side of the piston? |
Both sides |
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For every crankshaft rotation how many compression strokes are there on a Double acting air compressor? |
Two compression strokes per revolution |
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With special design do labyrinth compressors have? |
They run without oil |
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How do you Labrinth compressors run without oil? |
A series of grooves machined into the piston and cylinder wall preventable oil from passing |
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Labyrinth compressors do not have _______ that most compressors |
Piston rings |
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A series of labyrinths causes what? |
Pressure to drop until there is acceptable leakage |
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What holds the piston rod steady in the labyrinth compressor? |
The guide bushing |
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Labyrinth compressors Require more or less power to operate the comparable compressors with piston rings? |
Labyrinth compressors require less power to operating comparable compressors with piston rings |
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Name one advantage and one disadvantage of labyrinth compressors |
Air of free of oil. More internal leakage |
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Diaphragm compressors are suitable for areas where? |
Oil free air is needed |
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The conrod in a diaphragm compressor connects to what? |
The diaphragm or flexible membrane |
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Diaphragm compressor’s produce type of air characteristics? |
Low flow rates, moderate pressure and vacuum service only |
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In a diaphragm compressor what separates the compression area from the oil? |
The flexible membrane or diaphragm |
