RETA CARO Exam 2026 | Actual Test
Questions & Detailed Verified Answers | A+
Pass Study Guide
RETA CARO Exam 2026 | Actual Test Questions & Detailed Verified Answers |
A+ Pass Study Guide
This study guide contains 300 carefully crafted multiple-choice questions to help
you prepare and pass the RETA CARO (Certified Assistant Refrigeration Operator)
exam. Read each question carefully, attempt an answer before checking the correct
option, and study the EXPERT RATIONALE to reinforce your understanding.
Q1. What does CARO stand for?
A. Certified Assistant Refrigeration Operator
B. Central Automated Refrigeration Output
C. Cooling And Refrigeration Operations
D. Certified Advanced Refrigeration Officer
E. Commercial Automated Refrigeration Operator
CORRECT ANSWER: A. Certified Assistant Refrigeration Operator
EXPERT RATIONALE: CARO is the designation given by RETA (Refrigerating Engineers
and Technicians Association) to individuals who demonstrate foundational competency
in refrigeration systems operation and safety.
Q2. What organization administers the CARO certification?
A. ASHRAE
B. OSHA
C. EPA
D. RETA
,E. ANSI
CORRECT ANSWER: D. RETA
EXPERT RATIONALE: RETA (Refrigerating Engineers and Technicians Association) is
the certifying body responsible for administering the CARO exam and maintaining its
standards.
Q3. Which refrigerant is classified as a natural refrigerant?
A. R-22
B. R-134a
C. R-410A
D. R-404A
E. Ammonia (R-717)
CORRECT ANSWER: E. Ammonia (R-717)
EXPERT RATIONALE: Ammonia (R-717) is a natural refrigerant widely used in
industrial refrigeration. It has zero ODP and zero GWP, making it environmentally
favorable.
Q4. What is the boiling point of ammonia at atmospheric pressure?
A. -10°F
B. -28°F
C. -33°C (-27.4°F)
D. 0°C
E. -50°C
CORRECT ANSWER: C. -33°C (-27.4°F)
, EXPERT RATIONALE: Ammonia boils at -33°C (-27.4°F) at standard atmospheric
pressure (14.696 psia), which makes it effective as a refrigerant in low-temperature
applications.
Q5. What is the primary purpose of a refrigeration system?
A. To generate heat
B. To remove heat from a conditioned space or product
C. To add moisture to the air
D. To compress air
E. To increase the pressure of a gas
CORRECT ANSWER: B. To remove heat from a conditioned space or
product
EXPERT RATIONALE: The fundamental purpose of refrigeration is heat removal —
transferring thermal energy from a low-temperature space or product to a higher-
temperature environment.
Q6. Which component of a refrigeration system increases the pressure of the
refrigerant vapor?
A. Condenser
B. Evaporator
C. Expansion valve
D. Compressor
E. Receiver
CORRECT ANSWER: D. Compressor
EXPERT RATIONALE: The compressor raises the pressure and temperature of the
refrigerant vapor, enabling it to condense and release heat in the condenser.
, Q7. In a basic refrigeration cycle, where does the refrigerant absorb heat?
A. Compressor
B. Condenser
C. Expansion valve
D. Receiver
E. Evaporator
CORRECT ANSWER: E. Evaporator
EXPERT RATIONALE: The evaporator is where the low-pressure liquid refrigerant
absorbs heat from the surrounding environment or product, causing it to boil and
vaporize.
Q8. What happens to refrigerant in the condenser?
A. It absorbs heat and evaporates
B. It is compressed to high pressure
C. It releases heat and condenses to liquid
D. It expands and cools
E. It is stored at low pressure
CORRECT ANSWER: C. It releases heat and condenses to liquid
EXPERT RATIONALE: In the condenser, the high-pressure refrigerant vapor releases
heat to the surrounding medium (air or water) and changes state from vapor to liquid.
Q9. What is the function of the expansion valve in a refrigeration system?
A. To increase refrigerant pressure
B. To compress refrigerant vapor
Questions & Detailed Verified Answers | A+
Pass Study Guide
RETA CARO Exam 2026 | Actual Test Questions & Detailed Verified Answers |
A+ Pass Study Guide
This study guide contains 300 carefully crafted multiple-choice questions to help
you prepare and pass the RETA CARO (Certified Assistant Refrigeration Operator)
exam. Read each question carefully, attempt an answer before checking the correct
option, and study the EXPERT RATIONALE to reinforce your understanding.
Q1. What does CARO stand for?
A. Certified Assistant Refrigeration Operator
B. Central Automated Refrigeration Output
C. Cooling And Refrigeration Operations
D. Certified Advanced Refrigeration Officer
E. Commercial Automated Refrigeration Operator
CORRECT ANSWER: A. Certified Assistant Refrigeration Operator
EXPERT RATIONALE: CARO is the designation given by RETA (Refrigerating Engineers
and Technicians Association) to individuals who demonstrate foundational competency
in refrigeration systems operation and safety.
Q2. What organization administers the CARO certification?
A. ASHRAE
B. OSHA
C. EPA
D. RETA
,E. ANSI
CORRECT ANSWER: D. RETA
EXPERT RATIONALE: RETA (Refrigerating Engineers and Technicians Association) is
the certifying body responsible for administering the CARO exam and maintaining its
standards.
Q3. Which refrigerant is classified as a natural refrigerant?
A. R-22
B. R-134a
C. R-410A
D. R-404A
E. Ammonia (R-717)
CORRECT ANSWER: E. Ammonia (R-717)
EXPERT RATIONALE: Ammonia (R-717) is a natural refrigerant widely used in
industrial refrigeration. It has zero ODP and zero GWP, making it environmentally
favorable.
Q4. What is the boiling point of ammonia at atmospheric pressure?
A. -10°F
B. -28°F
C. -33°C (-27.4°F)
D. 0°C
E. -50°C
CORRECT ANSWER: C. -33°C (-27.4°F)
, EXPERT RATIONALE: Ammonia boils at -33°C (-27.4°F) at standard atmospheric
pressure (14.696 psia), which makes it effective as a refrigerant in low-temperature
applications.
Q5. What is the primary purpose of a refrigeration system?
A. To generate heat
B. To remove heat from a conditioned space or product
C. To add moisture to the air
D. To compress air
E. To increase the pressure of a gas
CORRECT ANSWER: B. To remove heat from a conditioned space or
product
EXPERT RATIONALE: The fundamental purpose of refrigeration is heat removal —
transferring thermal energy from a low-temperature space or product to a higher-
temperature environment.
Q6. Which component of a refrigeration system increases the pressure of the
refrigerant vapor?
A. Condenser
B. Evaporator
C. Expansion valve
D. Compressor
E. Receiver
CORRECT ANSWER: D. Compressor
EXPERT RATIONALE: The compressor raises the pressure and temperature of the
refrigerant vapor, enabling it to condense and release heat in the condenser.
, Q7. In a basic refrigeration cycle, where does the refrigerant absorb heat?
A. Compressor
B. Condenser
C. Expansion valve
D. Receiver
E. Evaporator
CORRECT ANSWER: E. Evaporator
EXPERT RATIONALE: The evaporator is where the low-pressure liquid refrigerant
absorbs heat from the surrounding environment or product, causing it to boil and
vaporize.
Q8. What happens to refrigerant in the condenser?
A. It absorbs heat and evaporates
B. It is compressed to high pressure
C. It releases heat and condenses to liquid
D. It expands and cools
E. It is stored at low pressure
CORRECT ANSWER: C. It releases heat and condenses to liquid
EXPERT RATIONALE: In the condenser, the high-pressure refrigerant vapor releases
heat to the surrounding medium (air or water) and changes state from vapor to liquid.
Q9. What is the function of the expansion valve in a refrigeration system?
A. To increase refrigerant pressure
B. To compress refrigerant vapor
