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Reta Caro Practice Exam with
complete solutions latest version
Conduction is defined as heat energy that is - CORRECT ANSWER-moving through a
solid substance
What is the primary purpose of a refrigeration system ? - CORRECT ANSWER-achieve
and maintain a temperature
What is a hazard of trapping liquid ? - CORRECT ANSWER-A possible release
How much can the pressure of trapped liquid increase per degree Fahrenheit of
temperature increase - CORRECT ANSWER-100 to 150 psi
Mechanical refrigeration is a series of steps that - CORRECT ANSWER-moves heat
energy from a space or object to an area where it can do no harm
How does the refrigeration compressor maintain the temperature in the system
evaporators ? - CORRECT ANSWER-Drawing out vaporized refrigerant at a rate to
maintain the desired evaporating pressure
Which natural refrigerant is considered to be non- flammable - CORRECT ANSWER-
Carbon Dioxide
Heat energy always flows - CORRECT ANSWER-from an object at a higher
temperature to an object at a lower temperature
32 psia equals - CORRECT ANSWER-17.3 psig
0 ° F is equal to - CORRECT ANSWER--18 ° C
Why does the refrigerant in the condenser change state from vapor to liquid -
CORRECT ANSWER-The refrigerant loses heat energy to the surrounding environment
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If a liquid is below its saturation temperature what is its condition ? - CORRECT
ANSWER-Subcooled
What are the four necessary components of a mechanical refrigeration system ? -
CORRECT ANSWER-expansion device , evaporator , compressor , condenser
Superheat is found at which points of a typical system ? - CORRECT ANSWER-The
compressor suction and compressor discharge line
What are the replacement blended refrigerants called ? - CORRECT ANSWER-An
azeotrope or zeotrope
What is one positive characteristic of halocarbon refrigerants ? - CORRECT ANSWER-
They are usually not flammable
What is the primary reason for concern about HCFC- 22 concentration in an engine
room ? - CORRECT ANSWER-Oxygen deprivation
O psig is equal to - CORRECT ANSWER-14.7 psia
Discharge vapor from all compressors - CORRECT ANSWER-will contain some level of
superheat
Which category of compressor " traps " a volume of refrigerant vapor prior to
compression ? - CORRECT ANSWER-Positive displacement
When suction pressure rises , the operator should - CORRECT ANSWER-start another
compressor
The crankcase oil heater should be ON - CORRECT ANSWER-when the compressor is
off .
Slugging is caused by - CORRECT ANSWER-oil or liquid refrigerant
What should be done if liquid refrigerant appears while draining oil ? - CORRECT
ANSWER-Do what the SOP states
Proper oil management for a refrigeration system requires that - CORRECT ANSWER-a
log should record all oil added to and removed from a system
When heat is added to saturated liquid refrigerant it will always - CORRECT ANSWER-
evaporate
What effect does the addition of fins to evaporator coils have ? - CORRECT ANSWER-
It increases the efficiency of a unit by increasing the surface area
BRAINSCAPE1
Reta Caro Practice Exam with
complete solutions latest version
Conduction is defined as heat energy that is - CORRECT ANSWER-moving through a
solid substance
What is the primary purpose of a refrigeration system ? - CORRECT ANSWER-achieve
and maintain a temperature
What is a hazard of trapping liquid ? - CORRECT ANSWER-A possible release
How much can the pressure of trapped liquid increase per degree Fahrenheit of
temperature increase - CORRECT ANSWER-100 to 150 psi
Mechanical refrigeration is a series of steps that - CORRECT ANSWER-moves heat
energy from a space or object to an area where it can do no harm
How does the refrigeration compressor maintain the temperature in the system
evaporators ? - CORRECT ANSWER-Drawing out vaporized refrigerant at a rate to
maintain the desired evaporating pressure
Which natural refrigerant is considered to be non- flammable - CORRECT ANSWER-
Carbon Dioxide
Heat energy always flows - CORRECT ANSWER-from an object at a higher
temperature to an object at a lower temperature
32 psia equals - CORRECT ANSWER-17.3 psig
0 ° F is equal to - CORRECT ANSWER--18 ° C
Why does the refrigerant in the condenser change state from vapor to liquid -
CORRECT ANSWER-The refrigerant loses heat energy to the surrounding environment
BRAINSCAPE1
, BRAINSCAPE1
If a liquid is below its saturation temperature what is its condition ? - CORRECT
ANSWER-Subcooled
What are the four necessary components of a mechanical refrigeration system ? -
CORRECT ANSWER-expansion device , evaporator , compressor , condenser
Superheat is found at which points of a typical system ? - CORRECT ANSWER-The
compressor suction and compressor discharge line
What are the replacement blended refrigerants called ? - CORRECT ANSWER-An
azeotrope or zeotrope
What is one positive characteristic of halocarbon refrigerants ? - CORRECT ANSWER-
They are usually not flammable
What is the primary reason for concern about HCFC- 22 concentration in an engine
room ? - CORRECT ANSWER-Oxygen deprivation
O psig is equal to - CORRECT ANSWER-14.7 psia
Discharge vapor from all compressors - CORRECT ANSWER-will contain some level of
superheat
Which category of compressor " traps " a volume of refrigerant vapor prior to
compression ? - CORRECT ANSWER-Positive displacement
When suction pressure rises , the operator should - CORRECT ANSWER-start another
compressor
The crankcase oil heater should be ON - CORRECT ANSWER-when the compressor is
off .
Slugging is caused by - CORRECT ANSWER-oil or liquid refrigerant
What should be done if liquid refrigerant appears while draining oil ? - CORRECT
ANSWER-Do what the SOP states
Proper oil management for a refrigeration system requires that - CORRECT ANSWER-a
log should record all oil added to and removed from a system
When heat is added to saturated liquid refrigerant it will always - CORRECT ANSWER-
evaporate
What effect does the addition of fins to evaporator coils have ? - CORRECT ANSWER-
It increases the efficiency of a unit by increasing the surface area
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