BOC Study Guide 2026
Everything you need to pass the BOC exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 BOC Exam Format at a Glance
📚 BOC Topics to Study (32)
✍️ Sample BOC Questions & Answers
1. Which ASHRAE standard defines conditions for human thermal comfort in occupied spaces?
ASHRAE 55 specifies the combinations of temperature, humidity, air speed, and other factors that produce acceptable thermal comfort.
2. In a building's domestic hot water system, what is the purpose of a recirculation loop?
A recirculation loop continuously circulates hot water through the distribution piping so occupants get near-instant hot water at any fixture.
3. Why is proper ventilation important in maintaining indoor air quality?
Proper ventilation helps remove indoor pollutants and brings in fresh air, improving overall air quality.
4. What is the main goal of a root cause analysis after a repeated equipment failure?
Root cause analysis looks past the symptoms to the underlying cause, so corrective action prevents the failure from coming back.
5. Under EPA Section 608 rules, the leak rate that triggers mandatory repair for comfort cooling appliances containing 50 pounds or more of ozone-depleting refrigerant is:
Comfort cooling appliances must be repaired when the annualized leak rate exceeds 10%, versus 20% for commercial refrigeration and 30% for IPR.
6. What does 'TDS' stand for in boiler water treatment, and why is it monitored?
Total Dissolved Solids (TDS) measures the concentration of minerals and impurities in boiler water; high TDS causes scale, foaming, and carryover, controlled through blowdown.
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What Practice Test Geeks adds beyond an AI chat for BOC
An AI chatbot can quiz you, but it can't reproduce the exam conditions or keep your record. Here you get:
- A timed, full-length BOC mock exam — 120 questions in 180 minutes with a 67% pass mark, modeled on the official exam's question count and time limit, followed by a score report broken down by exam domain.
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- Progress saved on your device: completed tests, scores and missed questions stay in My Progress, so you can retake only what you got wrong.
- A printable BOC cheat sheet you can print or save as a PDF.
- BOC flashcards built from the same question bank.
- Free BOC practice tests with the correct answer shown after each question.
How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy
Sources & references
Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy
- theboc.info — Late registration, renewal, test delivery, fees, exam format, passing score, registration deadline, retake fee, retake policy, score release · verified Oct 2026