Exam (elaborations)

CSLB B GENERAL Study Guide Graded A

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Course
NU1426

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NU1426

CSLB B GENERAL Study Guide Graded A+ PTICH what size of a circuit breaker can be installed on a line with 7 outlets 14 AWG wire? how many roof squares are in the roof measuring 45' by 50'? total drop for a 120' pipe with a 2% slope? how many 4"x4" tiles do you need to tile 30"x60" shower floor...

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Uploaded on March 12, 2024
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CSLB B GENERAL Study Guide Graded A+

1). Ptich

 Ans: rise/span

2). What size of a circuit breaker can be installed on a line with 7 outlets 14 awg wire?

 Ans: 15 amp; according to code, the conductor ampacity rating for a 14 gauge wire is
15 amps. for 12 gauges wire is 20 amps. the number of outlets does not determine the
size of circuit breaker.

3). How many roof squares are in the roof measuring 45' by 50'?

 Ans: 22.5; (45x50) / 100 (roofing squares made of 10'x10').

4). Total drop for a 120' pipe with a 2% slope?

 Ans: 2'5" = 120x2%=2.4

5). How many 4"x4" tiles do you need to tile 30"x60" shower floor and three walls 60" high with
1/4" grout? allow 10% for waste.

 Ans: step 1: calculate total area: shower pan: 30"x60" = 1800 square inches. two small
walls 2 @( 30"x60")= 3600 square inches. back wall= 60"x60"=3600
total= 9000 square inches.
step 2: calculate tile coverage including grout. 4 1/4" x4 1/4" = 18.0625
step 3: divide 9000/18.0625 = 499 tiles
step 4: add 10%
499x.10= 50 tiles
549

6). The load area of skylight is equal to

 Ans: inside dimension of a deck mounted skylight; inside area of the skylight curb;
rough opening in the roof.

7). How many kwh will be consumed by a 500w lightbulb running for 3 hours?

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,  Ans: 1.5 kWh. step one solve for total watt-hours= 500w x 3=1500
step 2 convert: 1 kilowatt= 1000 watt
1500/1000=1.5

8). How many board feet do you need for a wall 20' long with 2x4 studs 8 feet high spaced at
16 o.c.?

 Ans: Step 1: convert wall length and stud height into inches, by multiplying length by
12.
wall: 20'x12=240"
stud: 8'x12=96"
step 2: divide wall length by the spacing of the studs
240"/16"= 15 studs + 1 starter= 16 studs total
step 3: figure out board feet
board feet= thickness in inches x width in inches x length in inches / 144.
2"x4"x96"/144=5.33 board feet per stud.
step 4: multiply board feet by number of studs
5.33x16=85.28 board feet.

9). Which of the following is a low slope roof system

 Ans: modified bitumen; can be applied to a slope no less than 1/4:12

10). The slope of a roof is the sum of the ___ divided by the ____

 Ans: rise;run

11). Calculate the total cost of trusses needed for a new framing project, where a gable roof is
50' long, each truss is spaced every 24" and the price of each truss is $80.

 Ans: 2080

12). What is a permanent or well-known elevation reference point?

 Ans: benchmark

13). In a l shaped kitchen, two parallel lines are 24' each and you are told that the remaining
lines are 12' each. to install a hardwood floor, what area are you covering?

 Ans: 432

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, 14). A brick wall has a total of 44 courses. if 3 bricks and 3 mortar joints equal 8", then how
hieght is the wall

 Ans: 10 feet

15). How many square feet is found in a single roofing square of composition shingles

 Ans: 100 square feet

16). Charging valve

 Ans:

17). How many bundles of 30-year asphalt shingles are in a square of roofing

 Ans: 3 bundles

18). Who is finally responsible for an approved set of plans

 Ans: contractor

19). The inverter requires minimum voltage unput of 350 volts, how many 48-volt modules
need to be connected in a seires configuration to meet the minimum voltage input?

 Ans: in a series configuration, the sum of voltage all all individual moduels will equal
to the total voltage output. divide voltage requirement by the voltage that is generated by
each module. 350/48=7.29

20). What is the sf of a gable 12 ft wide and 6 ft high

 Ans: 36 sqft height xbase/2

21). Which plan from a set of blueprints will give the true measurement of a rake

 Ans: elevation plan

22). The job requires 28 construction squares for siding. how many sf of siding do you need to
buy?

 Ans: 2800; 100 square feet in each construction square.

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