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Reta Caro Exam Practice Test Questions and
Correct Answers
Conduction is defined as heat energy that is Ans: — moving
through a solid substance
What is the primary purpose of a refrigeration system ? Ans: —
achieve and maintain a temperature
What is a hazard of trapping liquid ? Ans: — A possible release
How much can the pressure of trapped liquid increase per degree
Fahrenheit of temperature increase Ans: — 100 to 150 psi
Mechanical refrigeration is a series of steps that Ans: — 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 ? Ans: — Drawing out vaporized
refrigerant at a rate to maintain the desired evaporating pressure
Which natural refrigerant is considered to be non- flammable Ans:
— Carbon Dioxide
Heat energy always flows Ans: — from an object at a higher
temperature to an object at a lower temperature
32 psia equals Ans: — 17.3 psig
0 ° F is equal to Ans: — -18 ° C
Why does the refrigerant in the condenser change state from vapor
to liquid Ans: — The refrigerant loses heat energy to the
surrounding environment
If a liquid is below its saturation temperature what is its condition
? Ans: — Subcooled
What are the four necessary components of a mechanical
refrigeration system ? Ans: — expansion device , evaporator ,
compressor , condenser
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, 2 | Page
Superheat is found at which points of a typical system ? Ans: —
The compressor suction and compressor discharge line
What are the replacement blended refrigerants called ? Ans: — An
azeotrope or zeotrope
What is one positive characteristic of halocarbon refrigerants ?
Ans: — They are usually not flammable
What is the primary reason for concern about HCFC- 22
concentration in an engine room ? Ans: — Oxygen deprivation
O psig is equal to Ans: — 14.7 psia
Discharge vapor from all compressors Ans: — will contain some
level of superheat
Which category of compressor " traps " a volume of refrigerant
vapor prior to compression ? Ans: — Positive displacement
When suction pressure rises , the operator should Ans: — start
another compressor
The crankcase oil heater should be ON Ans: — when the
compressor is off .
Slugging is caused by Ans: — oil or liquid refrigerant
What should be done if liquid refrigerant appears while draining
oil ? Ans: — Do what the SOP states
Proper oil management for a refrigeration system requires that
Ans: — a log should record all oil added to and removed from a
system
When heat is added to saturated liquid refrigerant it will always
Ans: — evaporate
What effect does the addition of fins to evaporator coils have ?
Ans: — It increases the efficiency of a unit by increasing the
surface area
During hot gas defrost Ans: — high pressure gas flows through
and condenses in the evaporator
© 2025 All rights reserved
Reta Caro Exam Practice Test Questions and
Correct Answers
Conduction is defined as heat energy that is Ans: — moving
through a solid substance
What is the primary purpose of a refrigeration system ? Ans: —
achieve and maintain a temperature
What is a hazard of trapping liquid ? Ans: — A possible release
How much can the pressure of trapped liquid increase per degree
Fahrenheit of temperature increase Ans: — 100 to 150 psi
Mechanical refrigeration is a series of steps that Ans: — 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 ? Ans: — Drawing out vaporized
refrigerant at a rate to maintain the desired evaporating pressure
Which natural refrigerant is considered to be non- flammable Ans:
— Carbon Dioxide
Heat energy always flows Ans: — from an object at a higher
temperature to an object at a lower temperature
32 psia equals Ans: — 17.3 psig
0 ° F is equal to Ans: — -18 ° C
Why does the refrigerant in the condenser change state from vapor
to liquid Ans: — The refrigerant loses heat energy to the
surrounding environment
If a liquid is below its saturation temperature what is its condition
? Ans: — Subcooled
What are the four necessary components of a mechanical
refrigeration system ? Ans: — expansion device , evaporator ,
compressor , condenser
© 2025 All rights reserved
, 2 | Page
Superheat is found at which points of a typical system ? Ans: —
The compressor suction and compressor discharge line
What are the replacement blended refrigerants called ? Ans: — An
azeotrope or zeotrope
What is one positive characteristic of halocarbon refrigerants ?
Ans: — They are usually not flammable
What is the primary reason for concern about HCFC- 22
concentration in an engine room ? Ans: — Oxygen deprivation
O psig is equal to Ans: — 14.7 psia
Discharge vapor from all compressors Ans: — will contain some
level of superheat
Which category of compressor " traps " a volume of refrigerant
vapor prior to compression ? Ans: — Positive displacement
When suction pressure rises , the operator should Ans: — start
another compressor
The crankcase oil heater should be ON Ans: — when the
compressor is off .
Slugging is caused by Ans: — oil or liquid refrigerant
What should be done if liquid refrigerant appears while draining
oil ? Ans: — Do what the SOP states
Proper oil management for a refrigeration system requires that
Ans: — a log should record all oil added to and removed from a
system
When heat is added to saturated liquid refrigerant it will always
Ans: — evaporate
What effect does the addition of fins to evaporator coils have ?
Ans: — It increases the efficiency of a unit by increasing the
surface area
During hot gas defrost Ans: — high pressure gas flows through
and condenses in the evaporator
© 2025 All rights reserved
