Compressor Fundamentals Flashcards
T or F
0° kelvin is equal to -237°C
True
what is atmospheric pressure at sea level?
14.7 psi
T or F
you calculate gauge pressure by adding 14.7 to an absolute scale reading
False
Compressed air operates and much the same matter as oil and a hydraulic system except for two major differences. What are these two differences?
gases can be compressed
Gases expand to fill any container
what are three ways that air pressure can be increased?
reduce the volume
heat the gas
Pack more gas into the space
define pascal‘s law
Pressure applied to a static fluid is dispersed evenly in all directions, and at right angles
when pressure is increased in an enclosed space, the temperature ______________
increases
if the flow rate is constant, and the velocity is decreased, there will be a ______________ in pressure
increase
with an increase in altitude, a compressor needs __________ power to drive the compressor.
less
The combined gas law demonstrates the relationship between three variables before and after compression. State the formula that shows this relationship.
P1x V1 / T1 = P2 x V2 / T2
Which compressor has the power pistons and the compression pistons sharing the same crankshaft
Integral
List, the two reciprocating compressors that are particularly suited to oil free air delivery
Labyrinth
Diaphragm
T or F
positive displacement, compressors work on the principle of trapping a specific volume of air, and then reducing that volume (compressing) to get a higher pressure
True
how do compressors move gases and do work?
Raise the pressure of the gas
The purpose of the crosshead is to keep the ______________ centred in the packing throughout the full stroke
Piston rod
T or F
A double acting piston is connected directly to the connecting rod
False
what causes reciprocating compressor valves to open?
Pressure differential
intercoolers are used on double ___________ compressors to cool the air
Staged
List the three components that the Alberta boiler safety association requires to be installed on any air receiver
Gauge
Drain
Safety valve
if there is any possibility of a blockage in a compressed air system, what must be installed on the pressure side
A safety relief valve
T or F
Compressor capacity is usually determined by the amount of gas that enters the suction inlet at a given period of time
True
T or F
A two-stage compressor must compress the gas on both sides of the piston
False
T or F
double acting compressors compressed the gas on both sides of the piston
True
