Free practice questions for the California CSLB C-16 Fire Protection trade exam — sprinklers, underground fire mains, standpipes, maintenance and jobsite safety, with a written explanation on every answer in English, Spanish and Russian.
The C-16 Fire Protection exam is the CSLB trade test for California's fire sprinkler and fire suppression contractors. CSLB's official study guide splits it into five sections — planning and estimating, underground fire main systems, installing fire protection systems, maintenance and repair, and safety — with installation carrying the largest share at 36%. Practice it below: free, no sign-up, with a written explanation on every question.
No account needed. Pick an answer to see whether it's right and read the explanation — the same explanations you get on every question in the full course.
Every question tells you why the correct answer is correct and defines the terms it uses — so you learn the rule, not just the answer.
Questions are written from scratch against the official codes and agency publications for this exam — never copied from the real exam.
Every question and explanation is fully translated, with the English exam term kept alongside — not a shallow machine translation.
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The full C-16 Fire Protection course is 500 questions across 5 blocks, drawn from these five official content areas.
The second-largest block. You plan a fire protection project — laying out sprinkler coverage, sizing the water supply, reading plans and specifications — and then price it. Expect arithmetic: the exam provides a calculator, and questions mix quantity takeoff with hydraulics. One constant worth having cold is elevation: a column of water loses about 0.433 psi per foot of height, so a sprinkler 60 feet above the gauge costs you roughly 26 psi before friction loss enters the calculation at all. The trap in this section is scope. The C-16 classification covers all types of fire protection systems and their equipment but expressly excludes electrical alarm systems, so alarm wiring is not yours to plan or bid.
Trenching and shoring, laying pipe and thrust blocks, and setting fire hydrants and fire department connections. Small weight, high stakes — this is where the excavation rules bite. Cal/OSHA requires a protective system (sloping, benching, shoring or a shield) for any employee in an excavation that is not entirely in stable rock once it reaches 5 feet deep, and a ladder, stairway or ramp within 25 feet of lateral travel in any trench 4 feet or more deep. Candidates who blur those two depths give away easy points.
The biggest section: sprinkler systems, preaction and deluge systems, storage tanks and fire pumps, and other suppression systems. Know your system types by what actually admits water. A deluge system has open sprinklers and a valve released by a separate detection system, so when it trips every sprinkler flows at once; a wet-pipe or dry-pipe system only flows where a sprinkler has operated. Standpipes are sorted by hose outlet, not by how the pipe is filled: Class I is 2½-inch connections for the fire department, Class II is 1½-inch hose stations for occupants, Class III is both. Expect trim and appurtenance detail too — for example, the waterflow alarm device on each sprinkler system must operate on a flow equal to a single sprinkler of the smallest orifice on that system.
Inspecting, troubleshooting, repairing and maintaining fire protection equipment. The exam's favorite here is the impairment: when a required system goes out of service — even for a few hours to fix a riser — the California Fire Code requires the fire department and the fire code official to be notified immediately, and the building evacuated or an approved fire watch posted where the fire code official requires it. Recordkeeping and signage matter, but notification comes first.
Personnel safety, job site safety and underground work, all under Cal/OSHA's Construction Safety Orders. California is stricter than the federal standard in places, and the exam uses California's numbers: fall protection is required where work exposes an employee to a fall of more than 7½ feet, not the federal 6 feet. If you are also studying CSLB Law & Business, note that it asks the same safety material from the employer's side — written programs, reporting, who may stop unsafe work — while C-16 asks it from the installer's side.
You take the C-16 exam on a computer at a PSI testing center, closed book, with four choices per question and one best answer; a calculator is provided and no reference materials are allowed in the room. CSLB's official C-16 study guide publishes the five sections and their weights, but not the number of questions or the passing score — treat any site that quotes those figures as unverified. You get 3.5 hours per exam, the result is pass/fail on the spot, a failing report breaks your score down by section, and you may retake after 21 days within your application's 18-month window. There is no official Spanish version of the C-16 exam; CSLB instead allows an approved translator to read the exam to you, which is one more reason the English terms are worth learning.
The full C-16 course here is 500 questions across 5 blocks. At 30 questions a day that is roughly three weeks — two passes with time to re-drill your weakest sections before test day. Weight your study the way CSLB weights the exam: installation and planning together are more than 60% of it, and safety is another fifth. Read the explanation on every question you miss, because the exam rewords facts and memorizing answer positions does nothing. Pair the practice with the official study guide and the code books it lists, and if you are preparing for a second trade at the same time, the C-10 Electrical practice test covers the electrical side that the C-16 classification leaves out.
The full 500-question C-16 bank with a written explanation on every answer, weak-area practice and a timed final exam, in EN·ES·RU. California exam-prep schools list programs from about $250 to $1,200 — this is $20/month, on your phone, cancel anytime.
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