Flashcards in Module 1 Deck (32):
A compressor that compresses air to only one end of a cylinder
Cooling air between compressor stages
Cooling air after it leaves the compressor
Heat exchanger design where cooling water and air flow in opposite directions
Heat exchanger design where cooling water and air flow in the same direction
relieving all internal pressure from the compressor
As a compressor increases the air pressure, it also reduces the air _____.
What are the two classifications of air compressors when distinguished by their operating principles?
Positive displacement, Dynamic
Name the two methods used to connect the compressor drive to the compressor.
Direct Driven, V-Belt Driven
The movable part of a discharge valve is held in place by a(n) _____.
A compressor that compresses air in more than one step is called a(n) _____ compressor.
Cooling the air between stages in a multistage compressor reduces the _____ requirements.
Water-cooled intercoolers are usually _____ heat exchangers.
The most efficient and commonly found flow arrangement in a water-cooled intercooler is _____.
Cylinder-wall lubrication prevents piston rings from wearing, and _____.
The two basic methods used to lubricate a compressor are _____ lubrication and _____ lubrication.
The lubrication method that is used for heavy-duty compressors is _____ lubrication.
If oil-free air is required, compressors are used that require _____ lubrication or have only _____ lubrication.
No; Well-isolated bearing
A large compressor is started only when the compressor is _____.
Name at least two devices used to control pressure in a compressor.
Pressure Switch, Suction Unloader Valves, Centrifugal Pressure Release, Hydraulic unloader, Electric or Magnetic Unloader
An alternate way of causing compressor output to vary is to change the _____ of the compressor.
Name at least two advantages of reciprocating compressors.
Good Compression Ratios, Variety of Sizes, Low Operating Cost, and High Output in FT3/MIN/HP
To be efficient, a positive displacement compressor must decrease the air's _____.
Dynamic compressors increase air pressure by _____.
Accelerating the air.
The discharge valves of a compressor are opened by _____.
In which of the following ways are discharge valves closed?
a. Electrical impulse
c. Piston linkage
d. Spring action
d. Spring action
In multistage compressors, the required air pressure is created by compressing the air in _____.
Two or more unequal cylinders.
Of what benefit is the use of an intercooler in a multistage compressor?
Decreases horsepower requirements.
Air-cooled compressors are usually constructed with _____.
Water or liquid intercoolers are usually patterned after which of the following?
a. Automotive radiator
b. Evaporative coolers
c. Finned radiators
d. Shell-and-tube heat exchangers
D. Shell-and tube heat exchangers.
What lubrication method is used for heavy-duty compressors?