Recovery
What color are recovery cylinders
Grey bottom- yellow tops
A thermometer is said to "sense"
What is, sensible heat
Pressure is measured in
Pressure per square inch
Two locations where a cold air return should be installed:
Open area of wall and high on the wall.
How hot should the water be to warm a cylinder
not to exceed 125 degrees
How full can refrigerant containers be
What is 80%
The latent heat used in changing liquid to a solid is called the latent heat of ----
What is, fusion
Vaporization can be increased by -------the pressure on a liquid
What is reducing
In an air conditioning and refrigeration system, what occurs in an evaporator
The refrigerant absorbs the latent heat.
T or F: You can heat a cylinder with an open flame
FALSE
When getting the ready to recover refrigerant it is important to-----
Identify the refrigerant
The heat used to change a liquid to a gas or vapor is called
What is vaporization
Every mechanical refrigeration system has __________ different pressure levels.
What is 2
In an air conditioning and refrigeration system, what occurs in an evaporator?
The refrigerant absorbs the latent heat.
T or F:High and low voltage can be lethal
TRUE
One should always or never mix refrigerants in recovery cylinders
What is never!
Zero gauge pressure corresponds on the absolute scale to
14.7
Atmospheric pressure, at sea level is
14.7 PSIA
Which of the following is not a type of compressor
a. Lateral b. Reciprocating c. Rotary d. Screw. Centrifugal . Lateral b.
What is lateral
Glasses do not have to be worn when working with refrigerant, just gloves
False
Before the refrigerant enters the recovery machine, it should pass through
What is the filter dryer(pre filter)
The ton of refrigeration is equal to
12,000 BTU per hour
Pressure on the high pressure side of a mechanical refrigeration unit is called _______________.
What is discharge or head pressure
In a sealed system, pressure and temperature have what relationship
D. Follow each other up and down
T or F: You must use a regulator on nitrogen cylinders
TRUE