Module 3 Flashcards
the amount of water vapor suspended in the air at any time, compared with the amount of water vapor the air could hold if it were completely saturated
Relative humidity (RH)
the temperature at which water vapor condenses as it is cooled
Dew point
a device that causes air and water particles to separate
Moisture separator
a device, usually installed between the aftercooler and the air receiver, that removes oil and moisture from the system
Oil scrubber
Contaminants in air include dirt and _____.
Moisture
What are the two types of preliminary filters used with compressors?
Wet, Dry
Some dry filters use packed felt or cotton, and others use _____ elements.
Replaceable or Cartridge
In a wet filter, dirt is collected in the oil and in the ______.
Filter
The amount of water vapor contained in the air compared to what it could hold if it were completely saturated is called the _____.
Relative Humidity
The temperature at which water vapor condenses as it is cooled is called its _____.
Dew Point
The most common method used to remove vapor from compressed air is _____.
Condensation
After coolers that are used to condense water vapor in compressed air are cooled by _____ or _____.
Water, air
Water vapor in air begins to condense when the air is cooled to its _____.
Dew point
Compressed air can be dried by reducing its _____.
Temperature
Condensed moisture is usually removed from an aftercooler by a(n) _____ separator.
Mechanical
Moisture that is not removed by a separator can be extracted by directing the air through a(n) _____.
Oil scrubber
What are the two kinds of chemical air dryers used in pneumatic systems?
Deliquescent, adsorption
The type of chemical that absorbs moisture in a deliquescent air dryer is called a(n) _____.
Desiccant
The desiccant in an adsorption air dryer is regenerated by _____.
Heat
The required size of the receiver in a compressed air system depends on the system’s requirements of _____, _____, and _____.
Air flow time, Air flow rate, Allowable pressure drop
The most common contaminants in the air are dirt and _____.
Water vapor
Which of the following is the most common method of removing vapor from compressed air?
a. Condensation
b. Evaporation
c. Freezing
d. Gravity separation
a. Condensation
When washing a primary air filter, be sure to use _____.
A recommended solvent
Which method of heat transfer is used in a shel-and-tube heat exchanger?
Counterflow
What term is used to compare the amount of moisture in the air to what it could contain?
Relative humidity
If all other factors are the same, the air that has the lowest dew point is the air that has the _____.
Least water vapor
The amount of moisture that can be held in air decreases as the _____.
Pressure increases
Most pneumatic systems remove moisture from the air stream by _____.
Mechanical separation
What term best describes the condensation temperature of water vapor?
Dew point
What type of air dryer uses a chemical agent that absorbs moisture from the air?
Deliquescent
