CSLB CONCRETE C8 LICENSE 1 AND 2 EXAM NEWEST 2024
WITH COMPLETE QUESTIONS AND CORRECT VERIFIED
ANSWERS (DETAILED ANSWERS) ALREADY GRADED A+ 100%
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#1
What is the volume of a cylinder if the diameter equals 3 feet and the length
equals to 12 feet? - ANSWER-84.78 cubic feet
Explanation:
There are two ways to solve the problem. However, regardless of which
method is used, you need to first determine the area of the circle then multiply
it by the length.Traditional MethodUse the following formula:Area of the circle
= π x r x rWhere π = 3.14 and radius (r) = 1.5 feet (half of the diameter
length)Area = 3.14 x 1.5 x 1.5Area = 7.065 sq. ft.Multiply area by the length to
find the volume.7.065 x 12 = 84.78Shortcut MethodArea of the circle is 78.5%
of the square. Treat the circle as a square and solve for the area.Find the area
of the square instead of the circle.3' x 3' = 9 sq. ft.Since circle is 78.5% of the
square, multiply area of the square by 78.5% (or .785 if there is no percentage
sign on the calculator).9 sq. ft. x .785 = 7.065 square feetMultiply area by the
length to find the volume.7.065 x 12 = 84.78 cubic feet
Where are spiral rebar ties used? - ANSWER-In round columns
,Control joints in sidewalks should be spaced at what intervals? - ANSWER-Equal
to the width of the slab
Explanation:
Generally the control joints in sidewalks should be spaced equal to the width of
the slab, but not more than 6 feet apart.
One cubic foot of cement weighs approximately: - ANSWER-95 lbs
How many cubic yard of concrete is required for a 4" slab with the diameter of
15 feet? - ANSWER-2 ½ cubic yards
Explanation:
Traditional MethodUse the following formula:Area of the circle = π x r x rWhere
π = 3.14 and radius (r) = 7.5 feet (half of the diameter length)Area = 3.14 x 7.5 x
7.5Area = 176.625 sq. ft.Multiply area by the depth of the slab (in feet) to find
the volume in cubic feet.176.625 x .333 = 58.82 cubic feetConvert cubic feet
into cubic yards.58.82 ÷ 27 = 2.18 cubic yardsSince 2.18 is not a given option,
round up the number to 2.5 cubic yardsShortcut MethodThis problem can be
solved using a much simpler method. First is to find the area of the square,
then convert it into the area of the circle by multiplying it by 78.5%.Area of the
square = 15' x 15' = 225 square feetArea of the circle = 225 x .785 = 176.625
square feetDivide the volume by 81 to solve for the cubic yards for a 4"
slab.176.625 ÷ 81 = 2.18 cubic yardsSince 2.18 is not a given option, round up
the number to 2.5 cubic yards
The normal tolerance for the location of bends and ends of reinforcing bar is: -
ANSWER-+/- 2 inches
How many cubic yards of backfill are required for a 3' x 5' trench, 1500 ft long,
with a 1 foot diameter pipe? - ANSWER-789.72
,Explanation:
Step 1. Find the net face area of the trench deducting for pipe.Face area
including pipe: 3 x 5 = 15 square feetArea of the pipe: 𝐴=𝜋𝑟2A = 3.14 x .5 x .5A
= 0.785Find the face area of the trench minus area of the pipe, which will give
you the net area for the backfill.15 - 0.785 = 14.215Step 2. Find the total
volume of the backfill.14.215 x 1500 = 21322.5 cubic feetConvert the volume
into cubic yards.21322.5 ÷ 27 = 789.72 cubic yards
When can the live load be calculated by multiplying the height, width and
length of a pour and dividing by the deadload? - ANSWER-Never
Tensile strength in concrete is achieved by: - ANSWER-The use of steel
reinforcement.
Refer to the house plan. What is the total cost for the foundation slab if the
contractor charges $3.54 per square foot? - ANSWER-$6524.90
Explanation:
The easiest way to solve for the area of the slab is to image a full rectangle of
the slab and subtract void areas from the area of the slab.
Rectangle area: 28.167' x 71.5'= 2013.94 sq ftLeft void area: 6.667' x 1.83' =
12.2 sq ftCenter void area: 11.5' x 1.83' = 21.045 sq ftRight void area: 9.167' x
15' = 137.505Net area of the foundation slab: 2013.94 - 12.2 - 21.045 - 137.505
= 1843.19 sq ft.Calculate the price of the slab.1843.19 sq ft x $3.54 = $6524.90
What is the minimum spacing of parallel reinforcing bars placed in two or more
layers? - ANSWER-1 inch
, Explanation:
According to the American Concrete Institute, where parallel reinforcement is
placed in two or more layers, bars in the upper layers shall be placed directly
above bars in the bottom layer with clear distance between layers not less than
1 inch.
When applying concrete to concrete there are several factors to consider.
Which is most important? - ANSWER-In most cases the most important is the
bond.
What is the purpose of the rebar? - ANSWER-To increase the tensile strength
There are many ornamental uses of concrete, including casting architectural
elements, ornaments, and faux finishes. How would you describe terrazzo in
the simplest terms? - ANSWER-A special combination of colored rock and glass
for floors.
What is the minimum size of anchor bolt can be used in seismic category E? -
ANSWER-#5
The building code requires 5/8" anchor bolt to be used in seismic category E.
Construction loads are: - ANSWER-The maximum loads to which a structure will
ever be subjected.
In some cases it may be necessary to use stronger or double ties. Why? -
ANSWER-As a safety precaution when workers may need to climb on
reinforcement.
What size of rebar is used to reinforce stem wall? - ANSWER-#4
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