Case Analysis & Practical Application Flashcards

You arrive to repair a cracked ceramic floor tile and find multiple surrounding tiles also crack when lightly tapped. What does a hollow sound indicate, and what is the correct repair scope?

Answer: Debonded tiles with failed adhesive; remove and re-set all hollow tiles, not just the cracked one

A hollow sound indicates tiles have lost adhesion to the substrate; all debonded tiles must be removed and reset or cracking will recur.

A homeowner reports that their circuit breaker trips only when the air conditioner and the microwave are on at the same time. The breaker is 20 amps. What is the correct assessment?

Answer: The combined load exceeds the circuit rating; the microwave should be on a dedicated circuit

Tripping only under combined load indicates the circuit is genuinely overloaded; the NEC recommends dedicated circuits for large appliances like microwaves.

You are replacing window weatherstripping and notice the wood stops are rotted at the sill corners. The homeowner asks if you can just replace the weatherstripping. What should you advise?

Answer: Replace the rotted stops first, then install weatherstripping, to prevent continued moisture damage and air infiltration

Rotted stops indicate ongoing moisture intrusion; replacing them before applying weatherstripping addresses the cause and ensures the repair lasts.

A homeowner's outdoor wood fence posts are rotting at ground level after only five years. What was the most likely installation error?

Answer: Posts rated for above-ground use were installed in-ground without proper concrete footing depth

Using above-ground rated lumber in direct contact with soil accelerates rot; in-ground posts require pressure-treated lumber rated for ground contact (UC4B or UC4C).

You are installing a new bathroom exhaust fan to replace a non-ducted fan. The shortest path to exterior exhaust runs through a cold attic. What is the correct installation practice for the duct?

Answer: Use rigid or semi-rigid metal duct, insulate it in the attic section, and terminate with a backdraft-dampered exterior cap

Insulated rigid duct prevents condensation in cold attics, and a backdraft damper prevents cold air from entering when the fan is off; venting into the attic is a code violation.

A customer reports that their kitchen faucet has low hot water pressure but normal cold water pressure. Other hot water fixtures in the house have normal pressure. What is the most likely cause?

Answer: The faucet's hot water inlet valve or cartridge has debris restricting flow

Low hot pressure at only one fixture points to a localized restriction, most likely a clogged inlet screen or a failing cartridge in that specific faucet.

A homeowner wants to add a 240V outlet in the garage for an EV charger. You open the panel and find no open breaker slots. What is the safest next step?

Answer: Evaluate the panel's total capacity and advise the homeowner that a subpanel or load center upgrade may be needed

Adding high-draw circuits to a full panel requires assessing total load and potentially upgrading; arbitrarily removing circuits or overloading a panel creates fire hazards.