10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The CIRO exam has 135 questions and runs 3 hours.
These 10 free CIRO questions are organized by exam domain, so you can see how each part of the Certified Industrial Refrigeration Operator blueprint is tested. Reveal the answer and explanation under each question.
An ammonia vapor cloud is observed near a valve assembly in an engine room. The leak source is unknown. What is the best initial action?
Correct answer: B - Follow emergency procedures and use appropriate protective equipment before approaching
Where should an operator find first-aid information for ammonia exposure?
Correct answer: A - Ammonia SDS first-aid section
A compressor contactor remains energized after the start button is released. Which electrical feature explains this?
Correct answer: B - Latching auxiliary contact
An evaporator outlet vapor temperature is 20°F and the saturation temperature is 5°F. What is the superheat?
Correct answer: B - 15°F
A compressor shows high discharge pressure and high discharge temperature while condenser water temperature is elevated. Which condition is most likely contributing?
Correct answer: A - Reduced condenser heat rejection
A motor uses 120 kW for 10 hours. Another uses 150 kW for 6 hours. Which uses less energy?
Correct answer: B - The 150 kW unit
A DX evaporator has low suction pressure and liquid return toward the compressor. Which component should be investigated first?
Correct answer: A - Expansion valve refrigerant feed
A pumped-liquid system shows low recirculator level and reduced pump pressure differential. What is the most likely concern?
Correct answer: A - Liquid supply or circulation problem
In a two-stage ammonia system, high-stage suction conditions are abnormal while low-stage suction is normal. What should be evaluated?
Correct answer: A - Low-stage/intercooler/high-stage interaction
Why is fan delay commonly used after hot-gas defrost?
Correct answer: A - To prevent warm air circulation before cooling resumes
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