CSLB Concrete C8 License Practice Test #1 NEWEST
ACTUAL EXAM QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+
What is the volume of a cylinder if the diameter equals 3 feet and the
length equals to 12 feet? - CORRECT ANSWER 84.78 cubic feet
Where are spiral rebar ties used? - CORRECT ANSWER In round
columns
Control joints in sidewalks should be spaced at what intervals? -
CORRECT 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: - CORRECT ANSWER
95 lbs
How many cubic yard of concrete is required for a 4" slab with the
diameter of 15 feet? - CORRECT 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: - CORRECT 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? - CORRECT 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? - CORRECT
ANSWER Never
Tensile strength in concrete is achieved by: - CORRECT 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? - CORRECT 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? - CORRECT 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? - CORRECT ANSWER In most
cases the most important is the bond.
What is the purpose of the rebar? - CORRECT 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? - CORRECT 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? - CORRECT ANSWER #5
The building code requires 5/8" anchor bolt to be used in seismic
category E.
Construction loads are: - CORRECT 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? - CORRECT ANSWER As a safety precaution when workers may
need to climb on reinforcement.
ACTUAL EXAM QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+
What is the volume of a cylinder if the diameter equals 3 feet and the
length equals to 12 feet? - CORRECT ANSWER 84.78 cubic feet
Where are spiral rebar ties used? - CORRECT ANSWER In round
columns
Control joints in sidewalks should be spaced at what intervals? -
CORRECT 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: - CORRECT ANSWER
95 lbs
How many cubic yard of concrete is required for a 4" slab with the
diameter of 15 feet? - CORRECT 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: - CORRECT 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? - CORRECT 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? - CORRECT
ANSWER Never
Tensile strength in concrete is achieved by: - CORRECT 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? - CORRECT 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? - CORRECT 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? - CORRECT ANSWER In most
cases the most important is the bond.
What is the purpose of the rebar? - CORRECT 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? - CORRECT 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? - CORRECT ANSWER #5
The building code requires 5/8" anchor bolt to be used in seismic
category E.
Construction loads are: - CORRECT 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? - CORRECT ANSWER As a safety precaution when workers may
need to climb on reinforcement.
