AND 100% CORRECT ANSWERS|LATEST
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
1
,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.
2
, 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.
3
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
1
,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.
2
, 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.
3
