Free ALCI Practice Questions

Question 1

After peeling back the wrap on an attic supply duct, an installer finds a loose sheet-metal takeoff. A 3/8-inch gap remains even when the takeoff is held in its correct position. Neither metal piece is damaged, and the work order includes repairing this connection. Which repair is appropriate before the wrap is restored?

Accepted Answer

Secure the takeoff with appropriate screws, then cover the gap with mesh and mastic.

Answer

Embed mesh in mastic around the gap and let the cured mastic hold the takeoff in position.

Answer

Secure the takeoff with appropriate screws, then bridge the gap with mastic without reinforcement.

Answer

Fasten the takeoff and seal the insulation jacket tightly around it to contain the escaping air.

Question 2

For a panel separating a test chamber from the room, an installer records: fan running; smoke stationary at the joint; manometer reading 0 Pa; both pressure-tube ends open to the room. Which interpretation is valid for the required 75-Pa smoke test?

Accepted Answer

Pressure across the panel is unverified because both tubes are sampling the same space.

Answer

The zero reading confirms that the panel joint has no remaining air leakage.

Answer

The running fan has failed to create a pressure difference between the room and chamber.

Answer

Swapping the two tubes at the gauge will verify the negative pressure inside the chamber.

Question 3

The crew leader marks a plumbing chase for sealing. An installer exposes ceiling gypsum on three sides, but the fourth edge remains beneath a removable batt and a loose storage-floor board. The board is clear of utilities and hazardous materials. To prepare a durable seal, the installer needs to expose:

Accepted Answer

The entire perimeter back to intact ceiling finish, including below the loose floorboard.

Answer

The top of the floorboard only, so the patch can be attached without exposing the cavity beneath it.

Answer

The nearest framing faces only, leaving the covered ceiling edge to be filled with foam after fitting.

Answer

Three ceiling edges only, with an oversized patch covering the concealed fourth edge.

Question 4

Before dense-packing a floored attic, the crew tests the machine using a box with an internal volume of 1.5 ft³. The empty box weighs 4.8 lb; filled, it weighs 10.5 lb. The work order specifies a minimum density of 3.5 lb/ft³. Which interpretation and next step are correct?

Accepted Answer

Density is 3.8 lb/ft³; retain the settings and smoke-check the first packed cavity at 75 Pa before filling the remainder.

Answer

Density is 7.0 lb/ft³; retain the settings and smoke-check the first packed cavity at 75 Pa before filling the remainder.

Answer

Density is 5.7 lb/ft³; retain the settings and smoke-check the first packed cavity at 75 Pa before filling the remainder.

Answer

Density is 3.8 lb/ft³; fill the remaining floor cavities with these settings, then smoke-check the completed section at 75 Pa.

Question 5

While a crew air-seals a gas-heated home, a carbon monoxide alarm sounds and two occupants report new headaches and nausea. No one smells smoke or fuel. What takes priority?

Accepted Answer

Move everyone outdoors and call 911 from outside; do not reenter until emergency responders give clearance.

Answer

Turn off exhaust equipment, open windows, and repeat the carbon monoxide check before deciding whether the house must be evacuated.

Answer

Send the occupants outside while the installer checks appliance vents for the source.

Answer

Shut off the heater, silence the alarm, and monitor the occupants inside the home.

Question 6

The work order retains a serviceable non-IC recessed light and calls for a sealed enclosure. The proposed box has a 1/2-inch gypsum top, no insulation above it, and sides extending through the full insulation depth. Insulation would be 4 inches from the lamp can but only 1-1/2 inches from its attached wiring box. Select the needed revision.

Accepted Answer

Move the enclosure side out to leave 4 inches between the insulation and the attached wiring box.

Answer

Leave the enclosure dimensions unchanged and line the wiring-box side with sheet metal to shield the heat.

Answer

Replace the gypsum top with foam board to offset the greater heat loss that a larger enclosure would create.

Answer

Defer sealing and request an IC-rated replacement, because a non-IC fixture cannot remain below an airtight enclosure.

Question 7

A bathroom fan has a 4-inch round outlet. Two exterior wall termination locations are approved: one is 8 feet away with one broad turn; the other is 18 feet away with three turns. Both satisfy the project's weather-protection and separation requirements. Which installation best preserves exhaust performance?

Accepted Answer

An 8-foot run of 4-inch insulated flex duct connected airtight to a full-sized hood at the nearer location.

Answer

An 8-foot run of 3-inch insulated flex duct connected to a 4-inch exterior hood at the nearer location.

Answer

An 18-foot run of 4-inch insulated flex duct with three turns connected to a full-sized hood at the farther location.

Answer

A 4-inch insulated flex duct ending just inside a nearby soffit vent, avoiding a dedicated exterior duct connection.

Question 8

Loose-fill insulation is at the specified depth over an exterior wall top plate, but wind passes beneath the soffit chute and through the insulation. The chute already maintains a clear 1-inch channel below the roof deck. The roof ventilation path must remain in service. How should the wind-washing problem be corrected?

Accepted Answer

Fit a wind block beneath the chute above the top plate; preserve the roof channel.

Answer

Add more loose-fill above the top plate without changing the air path beneath the chute.

Answer

Extend the chute farther toward the ridge without closing the opening below its lower end.

Answer

Close the soffit openings and rely on the existing ridge vent to ventilate the roof.

Question 9

An installer has fitted sheet-metal air stops around a propane-only vent and a wood-burning chimney. The available silicone RTV sealant is rated to 600°F and listed for gas-vent use, but has no approval for wood-chimney use. Which material decision is justified?

Accepted Answer

Use it at the propane vent; select a suitable noncombustible sealant for the wood chimney.

Answer

Use the RTV at both locations if each repair passes a smoke test.

Answer

Use the RTV at either location after covering the cured sealant with an additional layer of sheet-metal flashing.

Answer

Set the RTV aside for both locations because silicone sealants cannot be used at any combustion vent.

Question 10

The next bypass is between exposed ceiling joists in an unfloored attic. The joists are sound and adequate for the worker, tools, and platform. A properly sized temporary work platform is available. Choose the appropriate access plan for the repair.

Accepted Answer

Support and secure the platform on the joists, keeping body and equipment loads off the ceiling finish.

Answer

Lay the platform on the insulation between the joists so it spreads the worker's weight across the ceiling.

Answer

Support the worker on a joist; store heavy bags on the ceiling between joists.

Answer

Defer the repair until a carpenter installs a permanent walkway across the attic.

Free ALCI Practice Questions

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