Reta Caro Exam UPDATED Exam
Questions and CORRECT Answers
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
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
Questions and CORRECT Answers
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
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
