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 QCI exam has 50 questions and runs 2 hours 30 minutes.
These 10 free QCI questions are organized by exam domain, so you can see how each part of the Quality Control Inspector blueprint is tested. Reveal the answer and explanation under each question.
A contractor is replacing a painted window in a 1965 two-bedroom rental house. No lead testing has been performed. The foreman estimates that only 2 square feet of paint will be disturbed and proposes treating the job as minor maintenance. Under EPA's Renovation, Repair and Painting Rule, the QCI should require:
Correct answer: A - A certified renovation firm, a designated certified renovator, and the required lead-safe work practices.
Before insulating a repaired sheet-metal return plenum, a QCI examines a 1-inch-wide opening. The work specification adopts Standard Work Specifications detail 5.0106.1 for duct sealing. The proposed sealing materials are compatible with the duct and rated for the application. Select the repair that satisfies the detail's requirement for this opening.
Correct answer: A - A mechanically fastened rigid patch, with mesh and mastic extending at least 1 inch past the repair joint on all sides
A natural-draft water heater vents normally with the furnace blower off. With the blower running, the combustion appliance zone falls from -1 Pa to -8 Pa relative to outdoors, and spillage persists after two minutes. Door positions and exhaust-fan settings have not changed; ambient CO remains at 2 ppm. Which line of investigation is best supported?
Correct answer: B - Test the duct system for leakage and pressure imbalances affecting the appliance zone.
The final blower-door report lists 4.2 ACH50 and marks an air-sealing target of no more than 5.0 ACH50 as met. The measured airflow is 1,120 CFM50. The house has 1,500 square feet of conditioned floor area with 8-foot ceilings; an attached 500-square-foot garage with the same height is outside the tested enclosure. The report included the garage volume. Which corrected entry is appropriate?
Correct answer: D - 5.6 ACH50; the specified air-sealing target has not been met.
On a privately funded retrofit, the contract adopts the ASHRAE 62.2-2016 continuous local bathroom-exhaust requirement, with no higher airflow minimum. A 0.7-sone fan exhausts outdoors and delivers a verified 26 cfm continuously. Separate equipment provides whole-dwelling ventilation. The contractor proposes replacing the bathroom fan because it cannot deliver 50 cfm. Is that replacement necessary to satisfy the local-exhaust airflow requirement?
Correct answer: D - No. Its measured continuous airflow exceeds the 20-cfm local bathroom-exhaust minimum.
An interior infrared scan on a cold day shows narrow, evenly spaced cool stripes aligned with wood studs. The insulated cavity surfaces between them are warmer. The pattern remains unchanged during blower-door depressurization, and targeted physical checks find full, dry cavity insulation. What explains these findings most convincingly?
Correct answer: C - Greater conductive heat flow through the wood framing than through the insulated cavities
Midway through a final inspection, a properly functioning ambient CO monitor reads 82 ppm in the hallway. The household CO alarm is silent, and the occupants report no symptoms. A water-heater flue measurement taken earlier was 120 ppm air-free. Under ANSI/BPI-1200-S-2017, what must take priority now?
Correct answer: A - Stop the inspection, advise evacuation, leave, and have emergency services notified from outside.
A ventilation assessment for an existing 1,800-square-foot, three-bedroom home with four residents uses ASHRAE 62.2-2016. No infiltration credit or local-exhaust supplement applies. For continuous operation, the total rate is Q = 0.03 × floor area + 7.5 × (bedrooms + 1), in cfm. The installed fan is rated at 110 cfm but delivers 72 cfm through the completed duct system. Which finding should be recorded?
Correct answer: C - The requirement is 84 cfm; installed airflow is insufficient and needs correction and retesting.
The original work order called for a new bathroom fan and duct. An authorized change order instead specified repairing the duct and commissioning the existing fan. Inspection confirms that this revised work was completed and that the existing fan meets the required flow. The invoice nevertheless charges for a new fan as well as the verified duct repair. How should the QCI recommend reconciling the invoice?
Correct answer: C - Remove the uninstalled fan charge and retain the authorized, verified duct-repair charge.
At handoff, a resident switches the newly commissioned whole-dwelling ventilation fan off and says, 'I'll turn it on when I shower so it won't waste electricity.' The system is designed to run continuously, with a temporary boost for bathing. Which response best completes the occupant instruction?
Correct answer: A - Demonstrate normal and boost modes, then have the resident restore normal operation.
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