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Civil Engineering
Design Of Concrete Structures
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Q.1
The effect of adding calcium chloride in concrete isi) to increase shrinkageii) to decrease shrinkageiii) to increase setting timeiv) to decrease setting timeThe correct answer is
(i) and (iii)
(i)and(iv)
(ii) and (iii)
(ii) and (iv)
Q.2
Bulking of sand is maximum if moisture content is about
2 %
4 %
6 %
10 %
Q.3
The percentage of voids in cement is approximately
25%
40%
60%
80%
Q.4
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.5
According to IS: 456-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.6
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.7
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.8
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.9
Minimum grade of concrete to be used in reinforced concrete as per IS:456-is
M15
M20
M10
M25
Q.10
In T-shaped R C. retaining walls, the main reinforcement in the stem is provided on
the front face in one direction
the front face in both directions
the inner face in one direction
the inner face in both directions
Q.11
According to ISI recommendations, the maximum depth of stress block for balanced section of a beam of effective depth d is
0.43 d
0.55 d
0.68 d
0.85 d
Q.12
Which of the following R.C. retaining walls is suitable for heights beyond 6m?
L-shaped wall
T-shaped wall
counterfort type
all of the above
Q.13
Which of the following has high tensile strength ?
plain hot rolled wires
cold drawn wires
heat treated rolled wires
all have same tensile strength
Q.14
In a counterfort retaining wall, the main reinforcement is provided on thei) bottom face in front counterfortii) inclined face in front counterfortiii) bottom face in back counterfortiv) inclined face in back counterEortThe correct answer is
(i) and (ii),
(ii) and (iii)
(i) and (iv)
(iii) and (iv)
Q.15
In order to obtain the best workability of concrete, the preferred shape of aggregate is
rounded
elongated
angular
all of the above
Q.16
Modulus of rupture of concrete is a measure of
flexural tensile strength
direct tensile strength
compressive strength
split tensile strength
Q.17
Normally prestressing wires are arranged in the
upper part of the beam
lower part of the beam
center
anywhere
Q.18
A higher modular ratio shows
higher compressive strength of con-crete
lower compressive strength of concrete
higher tensile strength of steel
lower tensile strength of steel
Q.19
To minimize the effect of differential settlement, the area of a footing should be designed for
Dead load only
Dead load + live load
Dead load + fraction of live load
Live load + fraction of dead load
Q.20
The load carrying capacity of a helically reinforced column as compared to that of a tied column is about
5% less
10% less
5% more
10% more
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