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 CFC exam has 110 questions and runs 9 hours.
These 10 free CFC questions are organized by exam domain, so you can see how each part of the Florida Certified Plumbing Contractor Exam blueprint is tested. Reveal the answer and explanation under each question.
The flood-level rims of basement fixtures are below the elevation of the next upstream public-sewer manhole cover. All first-floor fixture rims are above that elevation. Which drainage arrangement is correct?
Correct answer: C - Route only the basement fixtures through an accessible backwater valve; leave the upper fixtures outside it
A subcontract requires the project owner to be an additional insured. The contractor sends a certificate of insurance naming the owner only as the certificate holder, with no additional-insured endorsement. What must still be obtained?
Correct answer: D - The applicable additional-insured endorsement; the certificate does not amend the policy
A commercial irrigation system injects fertilizer downstream of the service connection. A booster pump can create backpressure, the connection remains continuously pressurized, and a physical air gap is not feasible. Which backflow protection is appropriate?
Correct answer: C - A reduced-pressure principle (RPZ) assembly with a freely draining relief port
During rough-in, the plumbing foreman finds that the drawings and specifications call for different pipe sizes. The owner's site representative verbally directs the larger size and says the price can be settled later. Other work can continue. The contractor should:
Correct answer: A - Continue unaffected work, issue an RFI, and obtain written authorization before deviating
The complete cost base for a bid, including direct costs, project indirects, allocated overhead, contingency, bonds, and fees, is $360,000. The contractor requires a 20% gross margin on the selling price. Which bid price achieves that margin?
Correct answer: C - $450,000
A replacement boiler operates with positive vent pressure and produces condensate. An existing Category I water heater remains connected to a properly sized Type B vent. Select the compliant plan.
Correct answer: A - Use listed Category IV venting and condensate disposal; keep the Category I water heater on Type B
A crew is preparing to enter a 6.5-foot trench excavated in soil that is not stable rock. A competent person has inspected it, and a ladder is within 20 feet, but no sloping, shoring, or shielding is installed. Before entry, the crew must:
Correct answer: B - Install an appropriate protective system for the trench conditions
An oxygen pipeline passes its pressure and leak tests after copper-to-copper brazing, but a borescope shows heavy internal copper-oxide scale. The crew confirms that no purge gas flowed during brazing. This finding most directly shows that:
Correct answer: D - Required nitrogen purging was omitted; a leak test does not prove internal cleanliness
A job has a revised contract price of $1,200,000, cost to date of $420,000, estimated cost to complete of $420,000, and billings to date of $640,000. Using cost-to-cost percentage completion, the work-in-progress (WIP) schedule should report:
Correct answer: B - $40,000 of overbilling as a contract liability
A zone-valve box serving four operating rooms is installed inside one of those rooms. The oxygen pressure sensor for the area alarm is upstream of the zone valve. Which revision is required?
Correct answer: D - Move the zone valve outside the served area on the same floor and put the sensor downstream
The CFC exam also covers these domains. Drill them in the full free practice test:
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