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Civil Engineering
Concrete Technology And Design Of Concrete Structures
Quiz 2
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Q.1
If nominal shear stress tv exceeds the design shear strength of concrete xc, the nominal shear reinforcement as per IS : 456-1978 shall be provided for carrying a shear stress equal to
xv
xc
Tv + Tc
Q.2
Minimum pitch of transverse reinforcement in a column is
the least lateral dimension of the member
sixteen times the smallest diameter of longitudinal reinforcement bar to be tied
forty-eight times the diameter of transverse reinforcement
lesser of the above three values
Q.3
In case of hand mixing of concrete, the extra cement to be added is
5%
10%
15%
20%
Q.4
The main reinforcement in the heel of a T-shaped R.C. retaining wall is provided on
top face perpendicular to wall
bottom face perpendicular to wall
both top and bottom faces perpendicular to wall
none of the above
Q.5
1% of voids in a concrete mix would reduce its strength by about
5%
10 %
15%
20%
Q.6
The strength of concrete after one year as compared to 28 days strength is about
10 to 15% more
15 to 20% more
20 to 25% more
25 to 50% more
Q.7
Due to circumferential action of the spiral in a spirally reinforced column
Capacity of column is decreased
Ductility of column reduces
Capacity of column is decreased but ductility of column increases
Both the capacity of column and ductility of column increase
Q.8
The temperature reinforcement in the vertical slab of a T-shaped R.C. retaining wall is
Not needed
Provided equally on inner and front faces
Provided more on inner face than on front face
Provided more on front face than on inner face
Q.9
Increase in the moisture content in concrete
reduces the strength
increases the strength
does not change the strength
all of the above
Q.10
Which of the following statements is incorrect?
Minimum cross sectional area of longitudinal reinforcement in a column is 0.8%
Spacing of longitudinal bars measured along the periphery of column should not exceed 300 mm
Reinforcing bars in a column should not be less than 12 mm in diameter
The number of longitudinal bars provided in a circular column should not be less than four
Q.11
For walls, columns and vertical faces of all structural members, the form work is generally removed after
24 to 48 hours
3 days
7 days
14 days
Q.12
As compared to ordinary portland cement, high alumina cement has
higher initial setting time but lower final setting time
lower initial setting time but higher final setting time
higher initial and final setting times
lower initial and final setting times
Q.13
The purpose of reinforcement in pre-stressed concrete is
To provide adequate bond stress
To resist tensile stresses
To impart initial compressive stress in concrete
All of the above
Q.14
For a cantilever of effective depth of 0.5m, the maximum span to satisfy vertical deflection limit is
3.5 m
4 m
4.5 m
5 m
Q.15
A beam curved in plan is designed for
bending moment and shear
bending moment and torsion
shear and torsion
bending moment, shear and torsion
Q.16
The load factors for live load and dead load are taken respectively as
1.5 and 2.2
2.2 and 1.5
1.5 and 1.5
2.2 and 2.2
Q.17
Admixtures which cause early setting, and hardening of concrete are called
workability admixtures
accelerators
retarders
air entraining agents
Q.18
Finer grinding of cement
affects only the early development of strength
affects only the ultimate strength
both (a) and (b)
does not affect the strength
Q.19
Prestress loss due to friction occurs
only in post-tensioned beams
only in pretensioned beams
in both post-tensioned and preten-sioned beams
none of the above
Q.20
The maximum value of hoop compression in a dome is given by (where, w = load per unit area of surface of dome R = radius of curvature d = thickness of dome)
wR / 4d
wR/2d
wR/d
2wR/d
Q.21
Stress strain curve of high tensile steel
has a definite yield point
does not show definite yield point but yield point is defined by 0.1% proof stress
does not show definite yield point but yield point is defined by 0.2% proof stress
does not show definite yield point but yield point is defined by 2% proof stress,
Q.22
While designing the pile as a column, the end conditions are nearly
both ends hinged
both ends fixed
one end fixed and other end hinged
one end fixed and other end free
Q.23
The compressive strength of 100 mm cube as compared to 150 mm cube is always
less
more
equal
none of the above
Q.24
Approximate value of shrinkage strain in concrete, is
0.003
0.0003
0.00003
0.03
Q.25
The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by
tcr – rcs = tct
fcr>fcs>fc.
fcr
fc5>fcr>fC
Q.26
According to IS: 456-1978, the column or the strut is the member whose effective length is greater than
The least lateral dimension
2 times the least lateral dimension
3 times the least lateral dimension
4 times the least lateral dimension
Q.27
If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called
balanced beam
under-reinforced beam
over-reinforced beam
none of the above
Q.28
Ratio of permissible stress in direct compression and bending compression is
less than 1
between 1 and 1.5
between 1.5 and 2.0
greater than 2
Q.29
According to IS: 456-1978, the maximum reinforcement in a column is
2 %
4%
6 %
8 %
Q.30
In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the meridional force is always
zero
tensile
compressive
tensile or compressive
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