RETA CARO Certified Assistant Refrigeration Operator Vocabulary Game
Exam terms with clues and explanations by OpenExamPrep.
About the RETA CARO Certified Assistant Refrigeration Operator Vocabulary Game
A free word game for the RETA CARO Certified Assistant Refrigeration Operator exam. Each round shows a clue for one of 19 exam terms across 9 topics. Recall the term, spell it out, then read a short explanation. Rounds pick a random term, so you can keep playing as long as you like.
How to Play
- 1Read the clue and type a term with the right number of letters (3 to 6). Abbreviations count: type the letters only.
- 2Press Check Answer or Enter. Each letter changes color to show how close you are.
- 3You have 6 tries. Stuck? Need a hint? asks the AI tutor for a nudge without giving the term away, and Skip moves to a new term.
- 4After the round, read the explanation, ask the AI to explain it, share your result, or press Next.
- ARight letter, right spot
- AIn the term, wrong spot
- ANot in the term
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Topics in the RETA CARO Certified Assistant Refrigeration Operator Vocabulary Game
Heat and capacity
Refrigeration cycle
Compressor types
Compressor operation
Lubrication
Evaporators and coils
Condensers and receivers
Non-condensables
Safety and prevention
Sources for these terms (14)
- IIAR Basic Ammonia Refrigeration, Module 1: Introduction to Ammonia Refrigeration · Source checked 2026-11-03
- DOE Test Procedure for Computer Room Air Conditioners, Notice of Proposed Rulemaking · Source checked 2026-11-03
- ANSI/IIAR 1-2022, Definitions and Terminology Used in IIAR Standards · Source checked 2026-11-03
- IIAR Basic Ammonia Refrigeration, Module 2: Ammonia Refrigeration Systems · Source checked 2026-11-03
- OSHA Ammonia Refrigeration: Overview · Source checked 2026-11-03
- IIAR Basic Ammonia Refrigeration, Module 4: Compressors · Source checked 2026-11-03
- IIAR Removing Oil from an Ammonia Refrigeration System · Source checked 2026-11-03
- IIAR Basic Ammonia Refrigeration, Module 3: Evaporators · Source checked 2026-11-03
- IIAR Basic Ammonia Refrigeration, Module 6: Shut-Off Valves · Source checked 2026-11-03
- OSHA eTool: Ammonia Refrigeration · Source checked 2026-11-03
- OSHA 29 CFR 1910.119, Process Safety Management of Highly Hazardous Chemicals · Source checked 2026-11-03
- EPA Risk Management Program (RMP) Rule Overview · Source checked 2026-11-03
- OSHA Ammonia Chemical Data · Source checked 2026-11-03
- IIAR Ammonia Safety, Module 1: Ammonia Characteristics and Exposure Limits · Source checked 2026-11-03
About the RETA CARO Exam
RETA CARO is the entry-level Certified Assistant Refrigeration Operator credential. CARO verifies that an operator has the basic knowledge to safely assist with industrial ammonia refrigeration system operations under the supervision of a more experienced operator.
Exam sponsor: Refrigerating Engineers and Technicians Association (RETA). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.
Assessment
Single exam, 110 multiple-choice questions (100 scored, 10 unscored pilot)
Time Limit
3 hours
Passing Score
70 (minimum passing score)
Reported exam pass rate: Not publicly disclosed. Exam sponsor website
Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.
Frequently Asked Questions
Is the RETA CARO vocabulary game free?
Yes. The game is free to play with no sign-up. Signing in adds AI explanations for any term.
How does the RETA CARO vocabulary game work?
Each round shows a clue for one of 19 RETA CARO terms. Guess the term in six tries: green means the right letter in the right spot, yellow means the letter is in the term but in another spot, and gray means it is not in the term. After the round, read the explanation and play the next term.
Where do the RETA CARO terms come from?
OpenExamPrep researched each term from the Refrigerating Engineers and Technicians Association (RETA) content outline and primary sources, listed under Sources on this page. The game is independent study material, not an official exam resource.
How many questions are on the RETA CARO exam and how long is the exam?
CARO consists of 110 multiple-choice questions with a 3-hour time limit: 100 scored and 10 unscored pilot questions. The minimum passing score is 70%, based on the 100 active questions.
Is there a work-experience requirement to take CARO?
No. RETA states there are no minimum experience requirements for the CARO exam. CARO is the entry-level credential and is designed to confirm that an operator has the basic knowledge to function safely in an engine room under the supervision of a more experienced operator.