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Guide for G21 - National Standard Low-Voltage Electrician

Quiz G21 - National Standard Low-Voltage Electrician

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Quiz

1/10
Site Preparation and Sitework
A contractor is preparing a site for a new commercial structure and must establish the finished floor elevation relative to a benchmark. Which instrument is most appropriate for transferring elevations across the site over moderate distances with high accuracy?
Select the answer
1 correct answer
A.
Plumb bob
B.
Automatic level
C.
Tape measure
D.
Framing square

Quiz

2/10
Concrete and Foundations
A contractor is ordering ready-mix concrete for a footing with a specified compressive strength of 3,000 psi at 28 days. Which of the following ingredients most directly influences the water-cement ratio and therefore the final strength?
Select the answer
1 correct answer
A.
Amount of mixing water relative to cement
B.
Color of the aggregate
C.
Type of reinforcement
D.
Curing temperature only

Quiz

3/10
Masonry
A mason is installing a single-wythe CMU wall that will serve as an exterior bearing wall. Which mortar type provides the best balance of compressive strength and workability for most load-bearing above-grade applications?
Select the answer
1 correct answer
A.
Type K
B.
Type N
C.
Type M
D.
Type O

Quiz

4/10
Wood and Plastics
A framer is selecting wood structural panel sheathing for the exterior walls of a two-story residence. Which marking on the panel confirms that it is suitable for exterior exposure and load-bearing wall use?
Select the answer
1 correct answer
A.
APA Exposure 1 wall sheathing grade stamp
B.
Interior-use PS-1 plywood only
C.
Unstamped CDX
D.
Non-structural hardboard

Quiz

5/10
Thermal and Moisture Protection
In a cold climate, where should the primary vapor retarder typically be installed in an insulated wood-framed wall?
Select the answer
1 correct answer
A.
On the exterior of the sheathing
B.
On the warm (interior) side of the insulation
C.
In the middle of the insulation
D.
Directly in contact with brick veneer

Quiz

6/10
Doors, Windows, and Glazing
The IBC requires safety glazing in specific locations to reduce the risk of human impact injury. Which of the following locations typically requires safety glazing?
Select the answer
1 correct answer
A.
A skylight above a roof deck
B.
Glazing in a door, sidelight, or within 24 inches of a door and less than 60 inches above the floor
C.
Any window over 10 square feet
D.
Decorative leaded glass in any location

Quiz

7/10
Finishes
A contractor is hanging 5/8-inch Type X gypsum board on 24-inch on-center steel studs in a 1-hour rated wall. Which of the following fastener spacings typically meets code for the screws along framing members?
Select the answer
1 correct answer
A.
4 inches on center at edges only
B.
8 inches on center on the field and 12 inches at the perimeter for fire-rated assemblies with specific listed assembly requirements
C.
24 inches on center everywhere
D.
Adhesive only, no screws

Quiz

8/10
Mechanical and Plumbing Systems
What is the minimum required combustion air opening for a naturally drafted gas water heater located in a small mechanical closet without other combustion air supply?
Select the answer
1 correct answer
A.
No opening is required
B.
Openings sized per the mechanical code, typically using the rule of 1 square inch per 1,000 BTU/h input for each opening with all-indoor air, or other prescribed methods
C.
Only a ceiling grille is required
D.
A single 2-inch diameter hole

Quiz

9/10
Electrical Systems
In a dwelling unit, the NEC requires that receptacle outlets in dwelling unit kitchens serving the countertop surfaces be protected by which type of device?
Select the answer
1 correct answer
A.
GFCI only
B.
AFCI only
C.
Both GFCI and AFCI protection for 125-volt, 15- and 20-ampere receptacles serving countertop surfaces in dwelling unit kitchens (per current NEC editions)
D.
No protection required

Quiz

10/10
Means of Egress
The IBC specifies the minimum number of exits required from a space based on occupant load and common path of travel. At what occupant load does a single space typically require at least two exits or exit access doorways?
Select the answer
1 correct answer
A.
10 or more
B.
Greater than the single-exit occupant load threshold, which is 49 for most occupancies (with occupancy-specific exceptions)
C.
100 or more regardless of use
D.
500 or more
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  • Quiz name:G21 - National Standard Low-Voltage Electrician
  • Total number of questions:661
  • Number of questions for the test:50
  • Pass score:80%

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