Safety
The national law that covers workplace safety is _____.
OSHA
A compressor is designed to draw in _____ refrigerant from the evaporator.
low-pressure vapor
How many times can an expandable refrigerant be used?
once
Which type of refrigerant cylinder is gray on the bottom and yellow on the top?
recovery
The process of pumping a system's entire refrigerant charge into the liquid receiver is called a(n) _____.
pump-down
The primary hazard in a confined space is _____.
limited airflow
Heat is rejected out of a refrigeration system on the _____ side of the system.
high
Because they cannot be mixed with mineral oils, _____ refrigerants use synthetic oils for lubrication.
HFC
If the valve stem is turned counterclockwise as far as possible, the service valve is in the _____ position.
back seated
Pressure that is greater than atmospheric pressure is referred to as _____ pressure.
positive
When operating a fire extinguisher, the letters P.A.S.S. stand for _____.
pull, aim, squeeze, and sweep
The evaporation of a fluid is an indicator that _____ is being absorbed.
heat
The cylinder color code for R-134a is _____.
sky blue
Vacuum pump oil turns _____ when it is contaminated by water.
white and foamy
If the entire refrigerant charge has leaked out of a system, then a(n) _____ should be used to pressurize the system to test for leaks.
inert gas
When positioning an extension ladder, the base can be no farther from the wall than ______ the supported height.
one quarter
The term that describes moving first in one direction and then in the opposite direction is _____.
reciprocating
The lowest temperature at which a lubricant will flow is called the _____.
pour point
A Bourdon tube _____ as pressure inside it increases.
straightens
What is the maximum amount of refrigerant that a recovery cylinder should contain?
80% water capacity by weight
Based on ASHRAE Standard 34, the refrigerant classification which would indicate least toxicity is _____.
Class A1
What does an oil separator do?
removes most of the oil from the refrigerant vapor coming out of the compressor
Due to their high ozone depletion potential, _____ refrigerants are targeted first for phaseout by the Montreal Protocol.
CFC
What percentage of moisture and particulates must be removed from reclaimed refrigerants?
100%
Calculate the tare weight of a cylinder if its total weight is 590 lb, and the weight of the refrigerant in the cylinder is 450 lb.
140 lb