Civil Engineering Exams (Principles of Structural Analysis and Design) – Page 4

#60. It is a property of a material that has the ability to absorb energy in the plastic range.
A Toughness
B Brittleness
C Stiffness
D Resilience
Answer: Toughness
#61. It is a property of a material to absorb energy in elastic range.
A Toughness
B Brittleness
C ductility
D Resilience
Answer: Resilience
#62. It is the property of the material to defuse the plastic range without breaking.
A Toughness
B Brittleness
C ductility
D Resilience
Answer: ductility
#63. It is the point through which the resultant of the resistance to the applied force acts.
A Center of rigidity
B Eccentricity
C Center of mass
D point of inflection
Answer: Center of rigidity
#64. It is the distance between the center of mass and center of rigidity
A eccentricity
B deflection
C moment arm
D drift
Answer: eccentricity
#65. A 9 m cantilever retaining wall is subjected to active pressure increasing from 3 kN/m at the top(free end) to 54 kN/m at the base(fixed end) per meter strip of length of wall along its longitudinal axis. What is the maximum shear in kN.
A 265.5 kN
B 156.5 kN
C 256.5 kN
D 165.5 kN
Answer: 256.5 kN
#66. A 9 m cantilever retaining wall is subjected to active pressure increasing from 3 kN/m at the top(free end) to 54 kN/m at the base(fixed end) per meter strip of length of wall along its longitudinal axis. What is the maximum moment.
A 121.5 kN.m
B 688.5 kN.m
C 567 kN.m
D 810 kN.m
Answer: 810 kN.m
#67. A 9 m cantilever retaining wall is subjected to active pressure increasing from 3 kN/m at the top(free end) to 54 kN/m at the base(fixed end) per meter strip of length of wall along its longitudinal axis. If the wall were laterally supported at the free end, determine the moment at the base. For increasing triangular load FEM at the top is \( \frac{wL^2}{30}\), FEM at the base is \(\frac{wL^2}{20}\).
A -504.252 kN.m.
B 504.252 kN.m.
C 306 kN.m.
D -306 kN.m.
Answer: -306 kN.m.
#68. A pressure vessel, 320 mm in diameter is to be fabricated from steel plates. The vessel is to carry an internal pressure of 4 MPa. Find the required thickness of the plate if the vessel is to be cylindrical. The allowable stress is 120 MPa.
A 4 mm
B 5 mm
C 6 mm
D 7 mm
Answer: 6 mm
#69. A pressure vessel, 320 mm in diameter is to be fabricated from steel plates. The vessel is to carry an internal pressure of 4 MPa. What is the required thickness of the plate if the vessel is to be spherical? Allowable stress is 120 MPa.
A 2 mm
B 3 mm
C 4 mm
D 5 mm
Answer: 3 mm
#70. A spiral column 600 mm in diameter has an unsupported height of 2.4 m. The column is bent in single curvature and is braced against sidesways.
Given:

Axial load at service condition:

Dead Load, DL = 3200 KN

Live Load, LL = 1420 KN

Concrete compressive strength, fc' = 27.5 MPa
Steel yield strenght, fy = 413 MPa
What is the slenderness ratio of the column? Assume that column ends are pinned.
A 16
B 15
C 17
D 14
Answer: 16
#71. A spiral column 600 mm in diameter has an unsupported height of 2.4 m. The column is bent in single curvature and is braced against sidesways.
Given:

Axial load at service condition:

Dead Load, DL = 3200 KN

Live Load, LL = 1420 KN

Concrete compressive strength, fc' = 27.5 MPa
Steel yield strength, fy = 413 MPa
If the required steel ratio is 1.7 %, find the corresponding number of 32 mm diameter bars.
A 5
B 6
C 7
D 8
Answer: 6
#72. A spiral column 600 mm in diameter has an unsupported height of 2.4 m. The column is bent in single curvature and is braced against sidesways.
Given:

Axial load at service condition:

Dead Load, DL = 3200 KN

Live Load, LL = 1420 KN

Concrete compressive strength, fc' = 27.5 MPa
Steel yield strength, fy = 413 MPa
Find the number of 32 mm diameter bars required at ultimate design load strength, U = 1.2 D +1.6 L.
A 8
B 9
C 10
D 12
Answer: 10
#73. A trial batch for normal weight concrete with an average 28th day compressive strength of 42 MPa is to be proportioned based on the following:
Slump 50 mm to 100 mm
WC ratio by weight 0.41
Sp. gr. of cement 3.15
Sp. gr. of coarse aggregate 2.68
Sp. gr. fine aggregate 2.64
Water (net mixing) 200 kg/m3
Volume of rodded coarse aggregates 0.64 m3/m3
Unit Weight of Sand 15.7 kN / m3
Unit weight of concrete 23.6 kN/m3
What is the required dry rodded weight (KN) of coarse aggregate?
A 8 kN
B 7 kN
C 9 kN
D 10 kN
Answer: 10 kN
#74. A trial batch for normal weight concrete with an average 28th day compressive strength of 42 MPa is to be proportioned based on the following:
Slump 50 mm to 100 mm
WC ratio by weight 0.41
Sp. gr. of cement 3.15
Sp. gr. of coarse aggregate 2.68
Sp. gr. fine aggregate 2.64
Water (net mixing) 200 kg/m3
Volume of rodded coarse aggregates 0.64 m3/m3
Unit Weight of Sand 15.7 kN / m3
Unit weight of concrete 23.6 kN/m3
What is the combined weight of cement and water?
A 6.86 kN
B 6.74 kN
C 10 kN
D 9.44 kN
Answer: 6.74 kN
#75. A trial batch for normal weight concrete with an average 28th day compressive strength of 42 MPa is to be proportioned based on the following:
Slump 50 mm to 100 mm
WC ratio by weight 0.41
Sp. gr. of cement 3.15
Sp. gr. of coarse aggregate 2.68
Sp. gr. fine aggregate 2.64
Water (net mixing) 200 kg/m3
Volume of rodded coarse aggregates 0.64 m3/m3
Unit Weight of Sand 15.7 kN / m3
Unit weight of concrete 23.6 kN/m3
How much is the required weight of the dry sand?
A 6.74 kN
B 10 kN
C 6.86 kN
D 4.78 kN
Answer: 6.86 kN
#76. The spiral column is to be designed to carry a safe load of 2900 kN. Using a steel ratio ρg = 0.025 relative to the gross concrete area, what should be the minimum column diameter (mm)?
A 450
B 400
C 410
D 475
Answer: 450
#77. The spiral column is to be designed to carry a safe load of 2900 kN. The column diameter is 600 mm and the ratio of steel reinforcement to the gross concrete area, ρg = 0.02. Find the required minimum diameter of the main reinforcement.
A 28 mm ϕ
B 36 mm ϕ
C 16 mm ϕ
D 25 mm ϕ
Answer: 36 mm ϕ
#78. The spiral column is to be designed to carry a safe load of 2900 kN. What is the design axial strength of the column?
A 6813 kN
B 8631 kN
C 5813 kN
D 5836 kN
Answer: 5813 kN
#79. An 8m high retaining wall is subjected to lateral earth pressure increasing from 0 at the top to 138 kPa at the base. Flexural rigidity EI = 4.5 x 10 14 N.mm2. Analyze per meter length of wall.
Which of the following gives the moment at the base of the cantilever retaining wall?
A 1472 kN.m
B 589 kN.m
C -1472 kN.m
D -589 kN.m
Answer: 1472 kN.m