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RCC Structures Design
Quiz 5
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Q.1
Design of a two way slab simply supported on edges and having no provision to prevent the corners from lifting, is made by
Rankine formula
Marcus formula
Rankine Grashoff formula
Grashoff formula
Q.2
Cantilever retaining walls can safely be used for a height not more than
3 m
4 m
5 m
6 m
Q.3
An intermediate T-beam reinforced with two layers of tensile steel with clear cover 13 cm encased with the floor of a hall 12 meters by 7 meters, is spaced at 3 meters from adjoining beams and if the width of the beam is 20 cm, the breadth of the flange is
300 cm
233 cm
176 cm
236 cm
Q.4
A part of the slab may be considered as the flange of the T-beam if
Flange has adequate reinforcement transverse to beam
It is built integrally with the beam
It is effectively bonded together with the beam
All the above
Q.5
The pitch of the main bars in a simply supported slab, should not exceed its effective depth by
Three times
Four times
Five times
Six times
Q.6
Top bars are extended to the projecting parts of the combined footing of two columns L distance apart for a distance of
0.1 L from the outer edge of column
0.1 L from the centre edge of column
Half the distance of projection
One-fourth the distance of projection
Q.7
For a ribbed slab
Clear spacing between ribs shall not be greater than 4.5 cm
Width of the rib shall not be less than 7.5 cm
Overall depth of the slab shall not exceed four times the breadth of the rib
All the above
Q.8
The length of lap in tension reinforcement should not be less than the bar diameter × (actual tension / four times the permissible average bond stress) if it is more than
18 bar diameters
24 bar diameters
30 bar diameters
36 bar diameters
Q.9
As the percentage of steel increases
Depth of neutral axis decreases
Depth of neutral axis increases
Lever arm increases
Lever arm decreases
Q.10
If the bearing capacity of soil is 10 tonnes/cm² and the projection of plain concrete footing from walls, is a cm, the depth D of footing is
D = 0.0775 a
D = 0.775 a
D = 0.775 √a
D = 0.775 a²
Q.11
For normal cases, stiffness of a simply supported beam is satisfied if the ratio of its span to its overall depth does not exceed
10
15
20
25
Q.12
If depth of slab is 10 cm, width of web 30 cm, depth of web 50 cm, centre to centre distance of beams 3 m, effective span of beams 6 m, the effective flange width of the beam, is
200 cm
300 cm
150 cm
100 cm
Q.13
Based on punching shear consideration, the overall depth of a combined footing under a column A, is
(Area of the column A × Safe punching stress)/Load on column A
(Perimeter of column A × Safe punching stress)/(Load on column A + Upward pressure × Area of the column)
(Perimeter of column A × Safe punching stress)/(Load on column A × Upward pressure × Area of the column)
None of these
Q.14
According to load factor method, the permissible load ‘W’ on a short column reinforced with longitudinal bars and lateral stirrups, is
Stress in concrete × area of concrete
Stress in steel × area of steel
Stress in concrete × area of concrete + Stress in steel × area of steel
None of these
Q.15
Distribution of shear intensity over a rectangular section of a beam, follows:
A circular curve
A straight line
A parabolic curve
An elliptical curve
Q.16
If the shear stress in a R.C.C. beam is
Equal or less than 5 kg/cm², no shear reinforcement is provided
Greater than 4 kg/cm², but less than 20 kg/cm², shear reinforcement is provided
Greater than 20 kg/cm², the size of the section is changed
All the above
Q.17
In a pre-stressed member it is advisable to use
Low strength concrete only
High strength concrete only
Low strength concrete but high tensile steel
High strength concrete and high tensile steel
Q.18
A raft foundation is provided if its area exceeds the plan area of the building by
10 %
20 %
40 %
50 %
Q.19
The weight of reinforced concrete, is generally taken as
2200 kg/m³
2300 kg/m³
2400 kg/m³
2500 kg/m³
Q.20
A pre-cast pile generally used, is
Circular
Square
Octagonal
Square with corners chamfered
Q.21
High strength concrete is used in pre-stressed member
To overcome high bearing stresses developed at the ends
To overcome bursting stresses at the ends
To provide high bond stresses
All the above
Q.22
Design of R.C.C. cantilever beams, is based on the resultant force at
Fixed end
Free end
Mid span
Mid span and fixed support
Q.23
The diameter of longitudinal bars of a column should never be less than
6 mm
8 mm
10 mm
12 mm
Q.24
In a simply supported slab, alternate bars are curtailed at
1/4th of the span
1/5th of the span
1/6th of the span
1/7th of the span
Q.25
If L is the effective span of a R.C.C. beam which is subjected to maximum shear q
max
at the ends, the distance from either end over which stirrups for the shear, are provided, is
(L/2) (1 - 3/q
max
)
(L/3) (1 - 5/q
max
)
(L/2) (1 - 5/q
max
)
(L/2) (1 - 2/q
max
)
Q.26
If d is the diameter of a bar, f
t
is allowable tensile stress and f
b
, is allowable bond stress, the bond length is given by
f
t
.d/4f
b
(π/4). (f
t
.d/f
b
)
π f
t
.d²/f
b
(π/4). (f
t
.d3/f
b
)
Q.27
As per IS : 1343, total shrinkage for a pre-tensioned beam, is
3.0 × 10⁻²
3.0 × 10⁻³
3.0 × 10⁻⁵
3.5 × 10⁻⁵
Q.28
The section of a reinforced beam where most distant concrete fibre in compression and tension in steel attains permissible stresses simultaneously, is called
Balanced section
Economic section
Critical section
All the above
Q.29
In the zone of R.C.C. beam where shear stress is less than 5 kg/cm², nominal reinforcement is provided at a pitch of
One-half lever arm of the section
One-third lever arm of the section
Lever arm of the section
One and half lever arm of the section
Q.30
Distribution reinforcement in a simply supported slab, is provided to distribute
Load
Temperature stress
Shrinkage stress
All the above
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