ExamFoundry

Welcome to your C-43 Sheet Metal - Practice Exam 2

When installing a kitchen exhaust hood in a commercial building, NFPA 96 requires the exhaust fan to continue running after the cooking equipment is shut off. What is the minimum post-cooking exhaust purge time?

1 minute

5 minutes

The purge time is variable and set by the installing contractor — no minimum is specified

No post-cooking operation is required

None

When calculating the bid price for a commercial sheet metal project, which cost category is MOST often underestimated by beginning estimators?

Raw material cost

Labor burden (payroll taxes, workers comp, health insurance, and benefits added on top of base wage)

Equipment rental cost

Permit fees

None

When installing a sheet metal roof curb for a rooftop HVAC unit, what is the minimum height of the curb above the finished roof surface per industry standard?

4 inches

8 inches

12 inches

18 inches

None

A sheet metal contractor receives a purchase order for 500 linear feet of pre-manufactured 5-inch K-style aluminum gutter at $1.20 per linear foot plus 8% sales tax. What is the total material cost including tax?

$600.00

$648.00

$660.00

$576.00

None

What is the purpose of a 'shop drawing' submitted by a sheet metal contractor?

A sketch made in the field by the installation crew

A detailed drawing prepared by the contractor showing exactly how the sheet metal work will be fabricated and installed — submitted to the design team for review and approval before fabrication begins

A drawing showing the location of the contractor's shop

A financial document showing the cost breakdown of the project

None

When sealing sheet metal duct joints with UL 181-listed mastic, what is the minimum thickness of mastic that should be applied?

Paper thin — a very thin coat is all that is needed

1/16 inch minimum thickness — enough to fill all gaps and create a continuous seal over the joint

1/4 inch minimum thickness

1 inch minimum thickness

None

What is the purpose of 'pre-task planning' (job hazard analysis) before a sheet metal crew begins work on a new project phase?

Pre-task planning is a paperwork exercise with no practical safety benefit

Pre-task planning identifies the specific hazards of the planned work for that day (falls, struck-by, electrical, chemical) and specifies the controls that will be used (PFAS, guardrails, PPE, LOTO) — it is performed before work starts each day or when new work phases begin

Pre-task planning is only required when a supervisor is present

Pre-task planning is only required for the first day of work on a project

None

What is the purpose of a 'standing seam' in flat roofing or wall panel applications?

A seam that is visible from the interior of the building

A raised vertical rib formed by folding and locking adjacent panel edges upward — the raised seam prevents water from running over the seam and into the joint between panels, providing watertight performance without sealants

A seam that is laid flat and soldered

A structural seam that supports roof loads

None

What is the purpose of a 'formed S-slip' in rectangular duct connections?

An S-shaped connector that joins two duct sections on opposite (top and bottom) sides, with a drive clip on the remaining two sides to complete the connection

A type of sealant applied in an S-pattern at duct joints

A formed steel angle used to reinforce duct corners

A connector used only for round duct fittings

None

10.

What is the purpose of a 'turning vane' installed inside a rectangular duct elbow?

To add structural stiffness to the elbow walls

To redirect airflow smoothly around the bend, reducing turbulence, pressure loss, and noise compared to a plain elbow

To provide a mounting point for duct sensors

To connect two duct sections at the elbow

None

11.

When reviewing plans for a sheet metal project, what does a dashed line on an HVAC plan typically represent?

Existing ductwork to be demolished

Supply air ductwork above the ceiling

Return air ductwork above the ceiling

Sheet metal to be painted a dark color

None

12.

When a sheet metal worker is cutting galvanized steel with an angle grinder equipped with a cutting disc, what is the MOST critical PPE requirement?

Knee pads

A full face shield (not just safety glasses) to protect against sparks and grinding disc fragments that can shatter and become high-velocity projectiles

Hearing protection only

Steel-toed boots only

None

13.

On a set of HVAC drawings, the symbol '12x8' on a rectangular duct indicates:

The duct is 12 inches tall and 8 inches wide

The duct is 12 inches wide and 8 inches tall (the first number is always width; the second is height)

The duct has a 12-inch diameter and 8-foot length

The duct requires 12 gauge and 8 gauge metal

None

14.

What is the purpose of 'stiffening beads' (cross-beads) formed on a flat sheet metal duct panel?

To mark the bend lines for brake forming

To add rigidity to the flat panel, preventing it from flexing and producing the 'drumming' or 'oil-canning' sound under air pressure changes

To improve the appearance of the duct panel

To provide attachment points for insulation

None

15.

Which type of expansion joint is commonly used in long runs of copper gutter to accommodate thermal movement?

A fixed welded joint

A slip joint (expansion sleeve) that allows one gutter section to slide inside another by 1-2 inches, accommodating thermal expansion and contraction without buckling the gutter

A standard riveted lap joint sealed with caulk

An offset joint that bends the gutter around the expansion movement

None

16.

What is the minimum width of a clear walking path that must be maintained in a sheet metal shop under Cal/OSHA requirements?

18 inches

28 inches

36 inches

48 inches

None

17.

When soldering two pieces of copper sheet metal, what is the purpose of 'tinning' the soldering iron tip before use?

To cool the iron down to the proper temperature

To coat the tip with a thin layer of solder so heat transfers efficiently to the work and solder flows smoothly — an un-tinned, oxidized tip transfers heat poorly and causes poor solder flow

To harden the tip for long-term use

To clean flux off the iron tip

None

18.

What is the Cal/OSHA requirement for a safety data sheet (SDS) in a sheet metal shop?

SDSs are only required for chemicals used in quantities over 5 gallons

An SDS must be immediately accessible (within the work area) for every hazardous chemical used in the shop — workers must be trained on where to find the SDS and how to read it

SDSs are only required for toxic chemicals — common items like solder and flux do not require SDSs

SDSs only need to be maintained at the company's main office, not at job sites

None

19.

A sheet metal worker is fabricating a 45-degree elbow for a 10-inch diameter round duct. Using 3-piece construction (2 end pieces + 1 center piece), what is the angle cut on each end piece?

22.5 degrees

11.25 degrees

45 degrees

15 degrees

None

20.

What type of joint is used to connect two pieces of sheet metal end-to-end with no overlap — butting the edges directly against each other and welding?

Lap joint

Butt joint (butt weld)

Hem joint

Standing seam joint

None

21.

When sheet metal panels are fabricated with a 'concealed fastener' system, how are the panels attached to the building structure?

With exposed screws through the panel face

With concealed clips that attach to the building structure, over which the panel edge snaps or slides — the clip is completely hidden when the next panel is installed

With adhesive bonding only

With compression locks between panels without any fasteners

None

22.

When reviewing mechanical drawings for a sheet metal ductwork installation, what does 'CFM' represent?

Cubic Feet of Metal — the quantity of sheet metal required

Cubic Feet per Minute — the volumetric airflow rate the duct system must carry

Cost Factor Multiplier — a pricing adjustment for complex installations

Compound Fitting Method — the technique used for complex duct fittings

None

23.

When installing a sheet metal valley on a tile roof, the valley metal must extend a minimum of how many inches under the tile on each side?

4 inches

6 inches

10 inches

12 inches

None

24.

When working on a commercial rooftop installing sheet metal, which of the following represents a 'leading edge' fall hazard?

Working near an interior roof drain

Working at the unprotected edge of the roof where sheet metal panels are being installed progressively outward — each new leading edge of the advancing work is an unguarded fall hazard

Working near a rooftop HVAC unit

Working in the center of the roof away from all edges

None

25.

What is the minimum thickness of aluminum sheet metal for standing seam roofing panels per SMACNA?

.019 inch (approximately 26 gauge equivalent in aluminum)

0.032 inch (approximately 22-24 gauge equivalent in aluminum)

0.050 inch

0.080 inch

None

26.

When a sheet metal contractor submits a change order for extra work on a commercial project, the change order should include:

Only the additional material cost

The additional labor hours, labor rate, material costs, equipment, overhead markup, and profit margin for the extra work — plus a description of the scope change and its cause

Only a general estimate without itemization

Only the contractor's signature — no pricing breakdown is required

None

27.

What is the standard overlap for a 'lap joint' in sheet metal flashing work per SMACNA?

1 inch minimum

3 inches minimum

6 inches minimum

12 inches minimum

None

28.

What is the purpose of 'fall protection planning' before sheet metal workers begin work on a steep-slope metal roof installation?

Fall protection planning is only required after a worker falls

Fall protection planning identifies: anchor point locations and capacities; the type of PFAS components required; the maximum fall distance with available clearance; the rescue plan if a worker falls and is suspended in the harness; and assigns fall protection responsibilities to specific crew members — all before work begins

Fall protection planning is the responsibility of the building owner only

Fall protection planning is only required for work above 20 feet

None

29.

A sheet metal contractor is bidding a project that requires 2,000 linear feet of 6-inch round spiral duct. If spiral duct comes in 5-foot sections and the material cost is $4.50 per linear foot, what is the total material cost?

$4,500

$9,000

$18,000

$2,000

None

30.

When a sheet metal worker is exposed to zinc oxide fumes during welding of galvanized steel, what are the initial symptoms of metal fume fever?

Immediate unconsciousness

Delayed symptoms appearing 4-12 hours after exposure: fever, chills, muscle aches, and flu-like symptoms — often described as feeling like having the flu

Immediate burning sensation in the throat only

No symptoms — zinc oxide exposure is harmless at any level

None

31.

When fabricating a 'cheek plate' for a rectangular duct offset fitting, what does the term 'cheek' refer to?

The bottom face of the duct

The flat side panels of the offset fitting that connect the two parallel duct runs

The seam allowance at the end of the duct

The turning vanes inside the fitting

None

32.

When cutting sheet metal with aviation snips, what do the colors RED, GREEN, and YELLOW handles indicate?

Red = heavy gauge; Green = medium gauge; Yellow = light gauge

Red = cuts left curves; Green = cuts right curves; Yellow = cuts straight lines

Red = for steel only; Green = for aluminum only; Yellow = for stainless steel only

The color indicates the manufacturer — all colors cut the same way

None

33.

What is the purpose of 'heat tape' (self-regulating electric resistance cable) sometimes installed in gutters and downspouts in California mountain regions?

To heat the gutter metal to prevent warping from cold temperatures

To prevent ice dams from forming in gutters and downspouts in freezing temperatures — the heat tape maintains the gutter and downspout above freezing so that snowmelt can drain rather than freezing and blocking drainage

To improve the conductivity of aluminum gutters

To prevent birds from nesting in the gutters

None

34.

What is a 'soffit panel' in sheet metal building applications?

A panel installed on the wall above a window opening

A sheet metal panel installed on the underside of an eave overhang or covered walkway (the horizontal soffit area) — soffit panels provide a finished, weather-resistant surface to the underside of eave overhangs and may include ventilation perforations to allow attic ventilation

A wall panel installed at the base of a building (kickplate)

A panel used to cover mechanical equipment on a rooftop

None

35.

A sheet metal worker is using a nibbler to cut 22-gauge galvanized steel. The nibbler leaves a rough edge. What tool is used to deburr (smooth) this edge?

A plasma cutter

A file, deburring tool, or bench grinder with a wire wheel

A hand seamer

A riveter

None

36.

What is the difference between a Type I and a Type II exhaust hood?

Type I is used for bathroom exhaust; Type II is used for kitchen exhaust

Type I is a grease-rated hood for cooking equipment that produces grease-laden vapors (ranges, fryers, grills); Type II is a heat-and-moisture hood for equipment that does not produce grease (dishwashers, ovens, steamers)

Type I is installed outdoors; Type II is installed indoors

Type I is manufactured; Type II is field-fabricated

None

37.

When installing a pre-manufactured metal chimney through a wood-framed cathedral ceiling and roof, what must be installed at the ceiling penetration?

A simple drywall ring is sufficient

A listed ceiling support box (radiation shield) that maintains the required clearance between the chimney and the combustible framing and provides structural support for the chimney — it must be the same UL-listed system as the chimney

Any fireproof material can be used as the ceiling radiation shield

No special treatment is needed at the ceiling — only the roof penetration requires special treatment

None

38.

A sheet metal contractor is installing a roof drainage system that includes an internal (interior) downspout. What is the primary advantage of an interior downspout over an exterior downspout?

Lower material cost

Protection from freezing in cold climates and a cleaner building exterior appearance — interior downspouts are routed through the building interior where they are protected from freeze-thaw and are concealed

Faster installation

Interior downspouts always have greater drainage capacity

None

39.

When installing a gravity ventilator (gravity vent cap) on a commercial roof, what is the minimum height of the ventilator above the finished roof surface to prevent rain entry?

1 inch

3 inches

6 inches

12 inches

None

40.

When using a power drill to install sheet metal screws in a roofing application, what PPE is required SPECIFICALLY because of the screw installation activity?

A hard hat only

Safety glasses to protect against metal chips and broken drill bits that can become projectiles during screw driving, and cut-resistant gloves when handling sheet metal

Hearing protection only

No PPE is required for screw driving

None

41.

When installing an aluminum drip edge on a new construction roof, at what point during the roofing sequence is it installed at the rake edge?

Before the underlayment, under the underlayment at the rake

After the underlayment is installed, on top of the underlayment at the rake — the rake drip edge is installed last at the rake so that the underlayment is covered at the edge

Before the decking is installed

After all shingles are installed

None

42.

When sheet metal workers are using ladders for extended periods during gutter installation on a residential project, what ergonomic practice reduces musculoskeletal injury risk?

Always lean forward over the ladder to reach the gutter

Position the ladder so that work can be performed without reaching overhead or to the side — reposition the ladder frequently so the worker is always working within a comfortable, upright reach zone directly in front of their body

Work with one hand only so the other hand is free for balance

Use only extension ladders — step ladders cause ergonomic problems

None

43.

When sheet metal workers are working overhead (above their head height) to install ceiling-mounted ductwork, which PPE is MOST important to prevent struck-by injuries?

Steel-toed boots

A hard hat to protect against tools or metal pieces falling from the overhead work, plus safety glasses to protect against falling debris and overhead cutting activities

Hearing protection only

Knee pads for the overhead work position

None

44.

When installing a sheet metal flue collar (boot) around a round furnace flue pipe where it penetrates a sloped roof, what must be done to ensure the collar is watertight?

Caulk alone is sufficient — no other measures are needed

The flexible rubber collar must compress tightly against the pipe as the lead or rubber skirt of the boot is cut to fit the pipe diameter exactly; the boot must be installed with its base under the shingles on the upslope side and over the shingles on the downslope side; and the collar is sealed with a compatible sealant at the pipe

The pipe must be cut flush with the roof surface

The collar is installed over all shingles and secured with roofing nails only

None

45.

When installing a flexible duct connection between a sheet metal duct and a vibrating piece of HVAC equipment (fan, AHU, or heat pump), what is the minimum length of flexible duct connector required?

2 inches

6 inches

12 inches

24 inches

None

46.

What is the purpose of 'material handling equipment' (such as a rooftop conveyor or motorized hoist) when installing heavy sheet metal panels on a commercial rooftop?

To increase the decorative appearance of the installation

To reduce the manual lifting hazards to sheet metal workers — heavy metal panels can exceed safe manual lifting limits, and mechanical assistance prevents musculoskeletal injuries from repetitive heavy lifting

To comply with union contract requirements only

Equipment is never used for sheet metal installation — all work is done manually

None

47.

What is the standard maximum spacing for sheet metal gutter brackets (spikes and ferrules, hidden hangers, or strap hangers) in California applications?

12 inches

24 inches

36 inches

48 inches

None

48.

When installing aluminum gutters in California's coastal areas, which type of gutter hanger fastener should be used?

Plain carbon steel screws

Stainless steel screws or hot-dipped galvanized screws — both are corrosion-resistant and compatible with aluminum in a marine environment

Copper rivets

Aluminum rivets — always use the same metal as the gutter

None

49.

When a sheet metal contractor is installing sheet metal wall panels using exposed fasteners, what is required at each fastener location to prevent water infiltration?

No special treatment is needed — exposed fasteners are always watertight

A neoprene or EPDM gasketed screw (screw with an integral washer-backed neoprene gasket) must be used so that the gasket compresses against the panel surface when the screw is tightened, creating a watertight seal at each fastener penetration

Apply caulk over each screw head after installation

Use a washer cut from felt underlayment under each screw head

None

50.

When operating a forklift to move sheet metal coils or panel bundles in a shop or on a job site, what is PROHIBITED?

Lifting loads to the specified capacity of the forklift

Carrying passengers (riding on the forks or load) — forklifts are rated for loads only, not for carrying workers

Using the forklift with the load tilted back

Driving the forklift with the load raised only enough to clear the floor

None

51.

When installing a roof drain leader (downspout) connected to an underground storm sewer, what type of cleanout should be installed?

No cleanout is required — underground storm sewer connections never need cleaning

A cleanout access point (clean out tee or wye with removable plug) must be installed at the base of the downspout at or near the transition from vertical leader to horizontal underground pipe

The cleanout is installed at the roof drain level only

Cleanouts are only required for sanitary sewer connections — not storm drainage

None

52.

What is the hazard of 'repetitive motion' in a sheet metal fabrication shop, and how is it controlled?

Repetitive motion causes sheet metal to fatigue — it is a material hazard, not a worker hazard

Repetitive motion injuries (musculoskeletal disorders such as carpal tunnel syndrome and rotator cuff injuries) result from repeated hand motions (seaming, hammering, screw driving) — controlled by job rotation, ergonomic tool selection, work-rest schedules, and early reporting of symptoms

Repetitive motion is only a hazard for workers over 50 years old

Repetitive motion only occurs in office environments — it is not a shop hazard

None

53.

What does the abbreviation 'TDC' stand for in sheet metal ductwork installation?

Top Down Connection — the duct connects from above

Transverse Duct Connection — a proprietary flanged duct connection system using formed flanges and corner clips

Total Duct Capacity — the maximum CFM a duct section can carry

Thermal Duct Coating — a coating applied to reduce heat gain

None

54.

What is the purpose of a 'diverter' or 'splash guard' installed inside a gutter at the point where a valley drains into the gutter?

To redirect water away from the downspout

To slow and redirect the concentrated high-velocity stream of water from a roof valley so it does not shoot over the front lip of the gutter during heavy rain

To filter debris from the valley before it enters the downspout

To prevent ice dams at the valley discharge point

None

55.

When fabricating a galvanized steel duct, the SMACNA standard requires reinforcement (cross-breaking, beading, or angle iron reinforcement) when the duct width exceeds what dimension for low-pressure applications?

6 inches

12 inches

19 inches

36 inches

None

56.

What is the difference between 'galvanized' and 'galvalume' sheet metal?

Galvanized and galvalume are identical products with different brand names

Galvanized is coated with pure zinc; galvalume (Zn-Al-Si alloy coating) has a coating of approximately 55% aluminum, 43.4% zinc, and 1.6% silicon — galvalume provides superior corrosion resistance and heat resistance compared to pure zinc galvanized

Galvalume is heavier gauge than galvanized

Galvanized is used only for roofing; galvalume is only for ductwork

None

57.

What tool is used in a sheet metal shop to form a circular disc into a cone shape using a spinning process?

A brake press

A metal spinning lathe (spinning mandrel)

A nibbler

A Pittsburgh seamer

None

58.

What does Cal/OSHA require employers to do when a new employee is hired into a shop that uses hazardous chemicals?

Wait 30 days before providing any training

Provide Hazard Communication (HazCom) training before the employee begins work with or is potentially exposed to hazardous chemicals — covering: the SDS system; chemical hazards; PPE requirements; safe handling procedures; and emergency procedures

Provide training only if the employee specifically requests it

Post a list of chemicals on the break room bulletin board — no formal training is required

None

59.

What is the purpose of a 'T-bar' or 'hat channel' used in sheet metal soffit panel installation?

A decorative trim piece used at the edge of the soffit

Horizontal furring members fastened to the building structure to which soffit panels are attached — they provide a flat, level nailing surface for the soffit panels and create the proper soffit plane regardless of variations in the framing behind

A type of downspout connector

A tool used to form soffit panels on the job site

None

60.

When installing a round downspout that changes direction from vertical to horizontal (or at an offset), what fitting is used?

A round elbow (typically 75-degree or 90-degree)

A tee fitting

A reducer

A straight coupling

None

61.

What is the required safety inspection frequency for a portable ladder used daily in a sheet metal shop?

Once per year during the annual safety inspection

Before each use — the worker must visually inspect the ladder for cracked rails, broken rungs, damaged feet, and missing labels before climbing

Monthly inspections only

Only after the ladder has been involved in an incident

None

62.

When using a power shear (squaring shear) in a sheet metal shop, which safety practice is CRITICAL?

Always cut with the machine running at maximum speed

Keep fingers and hands clear of the blade at all times; use the hold-down clamp to secure the metal; and never attempt to remove cut pieces from under the blade while the machine is running

Stand to the side of the machine only — standing in front is acceptable

Remove the blade guard to improve visibility of the cut line

None

63.

When fabricating a round-to-round concentric reducer fitting, which layout method is used?

Parallel line development

Radial line development — the same method used for cone patterns

Triangulation

No pattern is needed — it is always purchased pre-manufactured

None

64.

When using a squaring shear to cut sheet metal, what is the function of the 'back gauge'?

A safety guard that prevents the worker's hands from reaching the blade

A movable stop attached to the rear of the shear table that allows the worker to position the sheet metal at a precise distance from the blade for consistent cut widths without measuring each piece

A device that adjusts the blade gap for different metal gauges

A clamp that holds the sheet metal flat during cutting

None

65.

What is a 'TDF' (Tab Drive Flange) or 'TDC' duct connection, and when is it preferred over S-slip and drive?

TDF/TDC is preferred for very small ducts under 6 inches

TDF/TDC is a formed-flange transverse connection system preferred for larger ducts (typically 14 inches and above) and higher-pressure applications because it provides a stronger, more airtight connection than S-slip and drive

TDF/TDC is a type of sealant application, not a connection method

TDF/TDC is only used for circular duct connections

None

66.

How many 4' x 8' sheets of 24-gauge galvanized steel are needed to fabricate 50 rectangular elbow fittings, each requiring 2.5 square feet of metal (including waste)?

11 sheets

16 sheets

20 sheets

25 sheets

None

67.

When designing a sheet metal drainage system, what factor determines whether a single downspout or multiple downspouts are needed for a given roof area?

The color of the downspout

The maximum drainage area per downspout based on local design rainfall intensity and downspout size — larger roof areas and higher rainfall require more downspouts

The height of the building above grade

The preference of the building owner

None

68.

What type of respiratory protection is required when spray-applying mastic sealant to sheet metal ductwork in a confined or poorly ventilated space?

No respiratory protection — mastic is always water-based and harmless

A half-face respirator with organic vapor cartridges (for solvent-based mastic) or a particulate respirator (for water-based mastic during spray application) — the specific cartridge type depends on the mastic formulation

A supplied-air respirator is always required regardless of mastic type

Only natural ventilation (opening a window) is needed for mastic application

None

69.

When installing a sheet metal ridge cap on a standing seam metal roof, the ridge cap must overlap the standing seam panels by at least:

1 inch on each side

3 inches on each side

6 inches on each side

12 inches on each side

None

70.

When installing coping caps on a parapet wall, the coping cap must shed water in which direction?

Toward the roof side only — water must never run to the exterior wall face

The coping cap must be sloped toward the roof side (inward) so that water drains onto the roof surface where it reaches the roof drain system — not toward the exterior building face where it would stain the wall and eventually erode the masonry

Level is acceptable — the direction of water flow is not critical for coping caps

Toward the exterior wall face only

None

71.

What is the purpose of 'mastic sealant' applied to sheet metal duct joints?

Mastic is applied as a structural adhesive to hold duct sections together

Mastic is a thick, flexible sealant applied over duct seams and joints to fill gaps and prevent air leakage — it is more durable than duct tape and remains flexible through temperature cycling, making it the preferred method for sealing ductwork per California Title 24 energy code

Mastic is applied to prevent corrosion only on the exterior of ductwork

Mastic replaces the need for mechanical connections like S-slips and drive clips

None

72.

When fabricating a rectangular duct transition (a fitting that changes from one rectangular size to another), what is the maximum offset angle per side recommended by SMACNA to minimize turbulence?

15 degrees

30 degrees

45 degrees

60 degrees

None

73.

What is 'duct leakage' and why does it matter for sheet metal estimating?

Duct leakage refers to water leaking into the duct — it never affects cost

Duct leakage is air escaping through gaps, seams, or pinholes in the ductwork — excessive leakage reduces HVAC efficiency and may require the contractor to seal all seams with mastic or tape, adding labor cost not included in a standard estimate

Duct leakage is the loss of sheet metal off the truck during delivery

Duct leakage only matters for Type I kitchen exhaust ducts

None

74.

What is the purpose of 'traffic control' setup when sheet metal workers are working in or adjacent to a parking lot or street?

To improve the appearance of the work zone

To protect sheet metal workers from vehicle traffic and to warn drivers to avoid the work zone — cones, barricades, and flaggers create a buffer zone between workers and moving vehicles

Traffic control is only required when workers are in the street — parking lots never require traffic control

Traffic control is always the building owner's responsibility

None

75.

When a sheet metal contractor is installing stainless steel Type I kitchen exhaust ductwork, why is stainless steel preferred over carbon steel for this application?

Stainless steel is always cheaper than carbon steel

Stainless steel provides superior corrosion resistance to the grease, steam, and acidic cleaning chemicals used in commercial kitchen environments, as well as better resistance to the high temperatures in the exhaust stream

Stainless steel is required because it is the only material approved by the CSLB

Carbon steel is never used in any commercial HVAC application

None

76.

When rigging sheet metal ductwork sections for a crane pick, the rigger must ensure the load is balanced. What is the consequence of an unbalanced rig?

The duct section may tip, shift, or spin during the lift — creating a striking hazard for workers and potentially causing the duct to contact the crane cable or building structure

An unbalanced rig only affects the appearance of the lift — it has no safety consequences

The ductwork will automatically balance itself once lifted

An unbalanced rig only affects the crane's fuel consumption

None

77.

When preparing a bid for a rooftop HVAC equipment curb installation, which item is MOST important to verify before finalizing the price?

The color of the HVAC unit

Whether the curb dimensions match the HVAC unit's base dimensions exactly, and the structural capacity of the roof deck to support the unit and curb

The manufacturer of the sheet metal curb

The height of the building

None

78.

What is a 'conductor head' (also called a conductor box or leader head) used for in a sheet metal drainage system?

An electrical conduit connection point in the gutter

A decorative flared transition fitting mounted on the building face that connects the gutter outlet to the top of the rectangular downspout — it collects water from the gutter and directs it into the downspout while providing an overflow point before the downspout

A cap installed at the top of a downspout to prevent debris from entering

A fitting that connects two downspout sections together

None

79.

What is the purpose of 'housekeeping' in a sheet metal fabrication shop from a fire prevention standpoint?

Housekeeping is a quality of life issue with no fire safety implications

Sheet metal scraps, oily rags, cardboard packaging, and flammable cutting fluids accumulate rapidly in a busy shop — regular housekeeping (removing flammable scrap, properly storing chemicals, disposing of rags in closed metal containers) dramatically reduces the fuel load available for a shop fire and is required by Cal/OSHA Title 8 Section 3228

Housekeeping in a shop only matters for OSHA inspections

Sheet metal shops have no fire risk — metal is non-combustible

None

80.

A sheet metal contractor needs to calculate the area of a hip roof for a standing seam metal roofing project. The building is 40 feet wide and 60 feet long with a 6:12 roof pitch. What is the slope factor applied to the horizontal plan area?

1.000

1.118

1.250

1.414

None

81.

When installing a prefabricated metal chimney (factory-built chimney) for a wood-burning fireplace, what is the minimum clearance from the top of the chimney to any part of the roof structure?

2 feet above the highest point of the roof within 10 feet

3 feet above the point of penetration through the roof AND 2 feet above any part of the roof within 10 feet of the chimney — whichever is greater

1 foot above the ridge

6 inches above the roofline

None

82.

When installing a sheet metal exhaust duct through a fire-rated wall assembly, what is typically required?

The duct can pass through without any special treatment

A fire damper (or combination fire/smoke damper) must be installed at the wall penetration to close automatically when the duct reaches a certain temperature, preventing fire spread through the duct opening in the rated assembly

The duct must be insulated only

The duct must be routed around the rated wall — penetrations are never permitted

None

83.

When installing a commercial kitchen Type I exhaust hood with an integral grease collection system, where must the grease troughs drain?

Into the kitchen floor drain

Into a UL-listed grease-rated container or grease trap — grease must not be discharged to the sanitary sewer without a trap

Into the exhaust duct above the hood

Grease drains are not required — grease evaporates in the exhaust stream

None

84.

What is the purpose of a 'job cost report' during an active sheet metal construction project?

A report submitted to the CSLB at project completion

A tracking document comparing actual costs incurred to date (labor hours, material costs) against the budgeted estimate for each cost code — used to identify overruns early and take corrective action

A document listing all subcontractors involved in the project

A report of all safety incidents during the project

None

85.

When a sheet metal contractor is performing hot work (torch soldering or cutting) on a roof, what safety measure is specifically required by most fire codes and jurisdictions?

The contractor must hire a private fire marshal

A hot work permit from the authority having jurisdiction (building owner's fire safety coordinator or local fire department), specifying fire prevention measures and a fire watch period after work stops

Hot work on a roof is prohibited — cold-process methods must always be used

A fire safety inspection is only required after the project is complete

None

86.

When reviewing a set of plans for a commercial kitchen exhaust system, the sheet metal contractor notices the Type I exhaust duct must have a minimum clearance from combustible construction. What is the minimum clearance per NFPA 96?

0 inches (no clearance required)

3 inches

6 inches

18 inches

None

87.

A sheet metal worker is fabricating a 90-degree elbow for a 12-inch diameter round duct using the 5-piece gore method. How many individual pieces will the finished elbow consist of?

2 pieces

3 pieces

5 pieces

9 pieces

None

88.

When sheet metal workers work near energized electrical equipment during an HVAC installation, what is the FIRST protective measure?

Wear rubber-soled boots

Request that the electrical contractor de-energize (lock out) all nearby electrical circuits before beginning any work in proximity to energized conductors

Work as fast as possible to minimize exposure time

Place a rubber mat on the floor near the electrical panel

None

89.

What is the purpose of a 'pitch pocket' (pitch pan) used in sheet metal roofing?

A container for storing roofing pitch (asphalt) on the jobsite

A sheet metal flashing collar installed around irregular-shaped penetrations (structural support columns, cables, pipes) that cannot be flashed with a standard pipe boot — the collar is filled with a pourable sealer (pitch) to create a watertight seal

A gauge used to measure roof pitch

A tool used to spread roofing pitch on a BUR roof

None

90.

Which California agency licenses sheet metal contractors?

California Department of Industrial Relations (DIR)

Contractors State License Board (CSLB)

California Air Resources Board (CARB)

California Department of Consumer Affairs (DCA) — Mechanical Division

None

91.

When transporting large sheets of sheet metal in an open truck bed or on a flatbed, what is required to secure the load?

The weight of the metal alone is sufficient to hold it in place

The metal sheets must be secured with tie-down straps or chains at multiple points and must not extend more than 3 feet beyond the rear of the vehicle without a red flag or amber light — California Vehicle Code governs load securement

Only the front of the load needs to be secured

Load securement is only required for loads over 1,000 lbs

None

92.

When installing a rain gutter on a fascia with a slight outward lean (the top of the fascia leans away from the building), how should the gutter be positioned?

The gutter should follow the fascia angle exactly, leaning outward

The gutter should be shimmed or re-pitched level regardless of the fascia angle, or the fascia should be re-mounted plumb — the gutter must not tilt outward, which causes water to spill over the front lip

The gutter should be tilted inward toward the building to compensate

The fascia angle never affects gutter performance

None

93.

A contractor is estimating a job that requires 800 square feet of 26-gauge galvanized steel for ductwork. If 26-gauge galvanized steel costs $0.85 per square foot and has a 15% waste factor, what is the total material cost?

$680

$782

$800

$920

None

94.

What is a 'plenum' in HVAC ductwork systems?

A small round duct section used for branch connections

A large sheet metal chamber that receives air from the air handling unit and distributes it to multiple duct branches, or that collects return air from multiple branches

A type of seam used in duct fabrication

A filter housing used in HVAC systems

None

95.

When fabricating a rectangular duct elbow using a cornice brake, what is the sequence of bends to form the elbow?

Make all bends simultaneously using multiple brakes

Lay out the pattern flat, then bend each side in sequence starting with the longest side, using the brake's back gauge to maintain consistent dimensions

Weld the four sides separately and then assemble

Cut the metal into four separate pieces and rivet them together

None

96.

A sheet metal contractor is calculating the lineal footage of gutter required for a building. The building has four sides, each 50 feet long. One side has no gutter (it drains to an interior scupper). What is the total lineal footage of gutter needed?

150 feet

200 feet

250 feet

300 feet

None

97.

What is the purpose of 'offset clips' used when installing sheet metal coping caps on a parapet wall with brick or stone facing?

To provide a decorative raised detail on the coping

To create a standoff between the coping cap and the top of the parapet, allowing the coping cap to be leveled and anchored at the correct height regardless of variations in the masonry surface height

To reduce the weight of the coping cap

To allow water to drain between the cap and the parapet

None

98.

When evaluating a job site for a sheet metal roofing installation, which condition would MOST likely require a structural engineering review before proceeding?

The roof has a 6:12 pitch

The existing roof has two layers of composition shingles that must be removed before the new metal roof is installed

The roof has large HVAC units that will remain in place, and the structural engineer must verify the deck can support the additional dead load of the metal roofing system

The building is located in a coastal zone

None

99.

When sheet metal ductwork is installed in an unconditioned attic space in California, what does Title 24 require regarding duct insulation?

No insulation is required for ductwork in attic spaces

Ducts in unconditioned attic spaces must be insulated to a minimum R-6 (some applications require R-8) to prevent excessive heat gain (in summer) and heat loss (in winter) that would reduce system efficiency

Only supply ducts need insulation — return ducts in attics do not require insulation

All ductwork in California must be R-19 regardless of location

None

100.

When installing sheet metal flashing at a parapet wall, the counter flashing that is embedded in the masonry joint must overlap the base flashing by at least:

1 inch

2 inches

3 inches

6 inches

None

1 out of 100

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