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Conduction is defined as heat energy that is -ANSWERS-moving through a solid
substance
What is the primary purpose of a refrigeration system ? -ANSWERS-achieve and
maintain a temperature
What is a hazard of trapping liquid ? -ANSWERS-A possible release
How much can the pressure of trapped liquid increase per degree Fahrenheit of
temperature increase -ANSWERS-100 to 150 psi
Heat energy always flows -ANSWERS-from an object at a higher temperature to an
object at a lower temperature
Why does the refrigerant in the condenser change state from vapor to liquid -
ANSWERS-The refrigerant loses heat energy to the surrounding environment
If a liquid is below its saturation temperature what is its condition ? -ANSWERS-
Subcooled
What are the four necessary components of a mechanical refrigeration system ? -
ANSWERS-expansion device , evaporator , compressor , condenser
, Superheat is found at which points of a typical system ? -ANSWERS-The compressor
suction and compressor discharge line
What are the replacement blended refrigerants called ? -ANSWERS-An azeotrope or
zeotrope
What is one positive characteristic of halocarbon refrigerants ? -ANSWERS-They are
usually not flammable
What is the primary reason for concern about HCFC- 22 concentration in an engine
room ? -ANSWERS-Oxygen deprivation
O psig is equal to -ANSWERS-14.7 psia
Discharge vapor from all compressors -ANSWERS-will contain some level of superheat
Which category of compressor " traps " a volume of refrigerant vapor prior to
compression ? -ANSWERS-Positive displacement
When suction pressure rises , the operator should -ANSWERS-start another
compressor
The crankcase oil heater should be ON -ANSWERS-when the compressor is off .
Slugging is caused by -ANSWERS-oil or liquid refrigerant
What should be done if liquid refrigerant appears while draining oil ? -ANSWERS-Do
what the SOP states
Proper oil management for a refrigeration system requires that -ANSWERS-a log should
record all oil added to and removed from a system