RETA CARO ACTUAL EXAM PAPER 2026
QUESTIONS WITH SOLUTIONS GRADED A+
◉ What is the primary purpose of a refrigeration system ? Answer:
achieve and maintain a temperature
◉ What is a hazard of trapping liquid ? Answer: A possible release
◉ How much can the pressure of trapped liquid increase per degree
Fahrenheit of temperature increase Answer: 100 to 150 psi
◉ Mechanical refrigeration is a series of steps that 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 ? Answer: Drawing out vaporized
refrigerant at a rate to maintain the desired evaporating pressure
◉ Which natural refrigerant is considered to be non- flammable
Answer: Carbon Dioxide
, ◉ Heat energy always flows Answer: from an object at a higher
temperature to an object at a lower temperature
◉ 32 psia equals Answer: 17.3 psig
◉ 0 ° F is equal to Answer: -18 ° C
◉ Why does the refrigerant in the condenser change state from
vapor to liquid Answer: The refrigerant loses heat energy to the
surrounding environment
◉ If a liquid is below its saturation temperature what is its condition
? Answer: Subcooled
◉ What are the four necessary components of a mechanical
refrigeration system ? Answer: expansion device , evaporator ,
compressor , condenser
◉ Superheat is found at which points of a typical system ? Answer:
The compressor suction and compressor discharge line
◉ What are the replacement blended refrigerants called ? Answer:
An azeotrope or zeotrope
QUESTIONS WITH SOLUTIONS GRADED A+
◉ What is the primary purpose of a refrigeration system ? Answer:
achieve and maintain a temperature
◉ What is a hazard of trapping liquid ? Answer: A possible release
◉ How much can the pressure of trapped liquid increase per degree
Fahrenheit of temperature increase Answer: 100 to 150 psi
◉ Mechanical refrigeration is a series of steps that 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 ? Answer: Drawing out vaporized
refrigerant at a rate to maintain the desired evaporating pressure
◉ Which natural refrigerant is considered to be non- flammable
Answer: Carbon Dioxide
, ◉ Heat energy always flows Answer: from an object at a higher
temperature to an object at a lower temperature
◉ 32 psia equals Answer: 17.3 psig
◉ 0 ° F is equal to Answer: -18 ° C
◉ Why does the refrigerant in the condenser change state from
vapor to liquid Answer: The refrigerant loses heat energy to the
surrounding environment
◉ If a liquid is below its saturation temperature what is its condition
? Answer: Subcooled
◉ What are the four necessary components of a mechanical
refrigeration system ? Answer: expansion device , evaporator ,
compressor , condenser
◉ Superheat is found at which points of a typical system ? Answer:
The compressor suction and compressor discharge line
◉ What are the replacement blended refrigerants called ? Answer:
An azeotrope or zeotrope
