RETA CARO / ACTUAL TEST QUESTIONS WITH DETAILED VERIFIED ANSWERS / ALREADY GRADED A / 2025|2026
Conduction is defined as heat energy that is ✔️moving through a solid substance
What is the primary purpose of a refrigeration system ? ✔️achieve and maintain a temperature
What is a hazard of trapping liquid ? ✔️A possible release
How much can the pressure of trapped liquid increase per degree Fahrenheit of temperature increase ✔️100 to 150 psi
Mechanical refrigeration is a series of steps that ✔️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 ? ✔️Drawing out vaporized refrigerant at a rate to
maintain the desired evaporating pressure
Which natural refrigerant is considered to be non- flammable ✔️Carbon Dioxide
Heat energy always flows ✔️from an object at a higher temperature to an object at a lower temperature
32 psia equals ✔️17.3 psig
0 ° F is equal to ✔️-18 ° C
Why does the refrigerant in the condenser change state from vapor to liquid ✔️The refrigerant loses heat energy to the surrounding
environment
If a liquid is below its saturation temperature what is its condition ? ✔️Subcooled
What are the four necessary components of a mechanical refrigeration system ? ✔️expansion device , evaporator , compressor , condenser
Superheat is found at which points of a typical system ? ✔️The compressor suction and compressor discharge line
What are the replacement blended refrigerants called ? ✔️An azeotrope or zeotrope
What is one positive characteristic of halocarbon refrigerants ? ✔️They are usually not flammable
What is the primary reason for concern about HCFC- 22 concentration in an engine room ? ✔️Oxygen deprivation
O psig is equal to ✔️14.7 psia
Discharge vapor from all compressors ✔️will contain some level of superheat
Which category of compressor " traps " a volume of refrigerant vapor prior to compression ? ✔️Positive displacement
When suction pressure rises , the operator should ✔️start another compressor
The crankcase oil heater should be ON ✔️when the compressor is off .
Slugging is caused by ✔️oil or liquid refrigerant
What should be done if liquid refrigerant appears while draining oil ? ✔️Do what the SOP states
Proper oil management for a refrigeration system requires that ✔️a log should record all oil added to and removed from a system
When heat is added to saturated liquid refrigerant it will always ✔️evaporate
What effect does the addition of fins to evaporator coils have ? ✔️It increases the efficiency of a unit by increasing the surface area
During hot gas defrost ✔️high pressure gas flows through and condenses in the evaporator
Evaporative condensers ✔️derive their heat rejection capability from the evaporation of water
Air cooled condensers usually have ✔️higher head pressures than evaporative condensers
Conduction is defined as heat energy that is ✔️moving through a solid substance
What is the primary purpose of a refrigeration system ? ✔️achieve and maintain a temperature
What is a hazard of trapping liquid ? ✔️A possible release
How much can the pressure of trapped liquid increase per degree Fahrenheit of temperature increase ✔️100 to 150 psi
Mechanical refrigeration is a series of steps that ✔️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 ? ✔️Drawing out vaporized refrigerant at a rate to
maintain the desired evaporating pressure
Which natural refrigerant is considered to be non- flammable ✔️Carbon Dioxide
Heat energy always flows ✔️from an object at a higher temperature to an object at a lower temperature
32 psia equals ✔️17.3 psig
0 ° F is equal to ✔️-18 ° C
Why does the refrigerant in the condenser change state from vapor to liquid ✔️The refrigerant loses heat energy to the surrounding
environment
If a liquid is below its saturation temperature what is its condition ? ✔️Subcooled
What are the four necessary components of a mechanical refrigeration system ? ✔️expansion device , evaporator , compressor , condenser
Superheat is found at which points of a typical system ? ✔️The compressor suction and compressor discharge line
What are the replacement blended refrigerants called ? ✔️An azeotrope or zeotrope
What is one positive characteristic of halocarbon refrigerants ? ✔️They are usually not flammable
What is the primary reason for concern about HCFC- 22 concentration in an engine room ? ✔️Oxygen deprivation
O psig is equal to ✔️14.7 psia
Discharge vapor from all compressors ✔️will contain some level of superheat
Which category of compressor " traps " a volume of refrigerant vapor prior to compression ? ✔️Positive displacement
When suction pressure rises , the operator should ✔️start another compressor
The crankcase oil heater should be ON ✔️when the compressor is off .
Slugging is caused by ✔️oil or liquid refrigerant
What should be done if liquid refrigerant appears while draining oil ? ✔️Do what the SOP states
Proper oil management for a refrigeration system requires that ✔️a log should record all oil added to and removed from a system
When heat is added to saturated liquid refrigerant it will always ✔️evaporate
What effect does the addition of fins to evaporator coils have ? ✔️It increases the efficiency of a unit by increasing the surface area
During hot gas defrost ✔️high pressure gas flows through and condenses in the evaporator
Evaporative condensers ✔️derive their heat rejection capability from the evaporation of water
Air cooled condensers usually have ✔️higher head pressures than evaporative condensers
