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Quiz 3
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Q.1
The thickness of base slab of a retaining wall generally provided, is
One half of the width of the stem at the bottom
One-third of the width of the stem at the bottom
One fourth of the width of the steam at the bottom
Width of the stem at the bottom
Q.2
The amount of reinforcement for main bars in a slab, is based upon
Minimum bending moment
Maximum bending moment
Maximum shear force
Minimum shear force
Q.3
The transverse reinforcements provided at right angles to the main reinforcement
Distribute the load
Resist the temperature stresses
Resist the shrinkage stress
All the above
Q.4
If ‘W’ is weight of a retaining wall and ‘P’ is the horizontal earth pressure, the factor of safety against sliding, is
1.0
1.25
1.5
2.0
Q.5
The maximum area of tension reinforcement in beams shall not exceed
0.15 %
1.5 %
4 %
1 %
Q.6
An R.C.C. beam of 25 cm width and 50 cm effective depth has a clear span of 6 meters and carries a U.D.L. of 3000 kg/m inclusive of its self weight. If the lever arm constant for the section is 0.865, the maximum intensity of shear stress, is
8.3 kg/cm²
7.6 kg/cm²
21.5 kg/cm²
11.4 kg/cm²
Q.7
Lapped splices in tensile reinforcement are generally not used for bars of size larger than
18 mm diameter
24 mm diameter
30 mm diameter
36 mm diameter
Q.8
If the size of a column is reduced above the floor, the main bars of the columns, are
Continued up
Bent inward at the floor level
Stopped just below the floor level and separate lap bars provided
All the above
Q.9
For initial estimate for a beam design, the width is assumed
1/15th of span
1/20th of span
1/25th of span
1/30th of span
Q.10
Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than
42 diameters from the centre of the column
42 diameters from the inner edge of the column
42 diameters from the outer edge of the column
24 diameters from the centre of the column
Q.11
After pre-stressing process is completed, a loss of stress is due to
Shrinkage of concrete
Elastic shortening of concrete
Creep of concrete
All the above
Q.12
If a rectangular pre-stressed beam of an effective span of 5 meters and carrying a total load 3840 kg/m, is designed by the load balancing method, the central dip of the parabolic tendon should be
5 cm
10 cm
15 cm
20 cm
Q.13
[A + (m - 1)ASC] known as equivalent concrete area of R.C.C. is given by
Modular ratio method
Load factor method
Ultimate load method
None of these
Q.14
The reinforced concrete beam which has width 25 cm, lever arm 40 cm, shear force 6t/cm², safe shear stress 5 kg/cm² and B.M. 24 mt,
Is safe in shear
Is unsafe in shear
Is over safe in shear
Needs redesigning
Q.15
In a combined footing for two columns carrying unequal loads, the maximum hogging bending moment occurs at
Less loaded column
More loaded column
A point of the maximum shear force
A point of zero shear force
Q.16
On piles, the drop must be at least
80 cm
100 cm
120 cm
140 cm
Q.17
If the maximum dip of a parabolic tendon carrying tension P is h and the effective length of the pre-stressed beam is L, the upward uniform pressure will be
8hp/l
8hp/l²
8hl/p
8hl/p²
Q.18
Pick up the incorrect statement from the following: Tensile reinforcement bars of a rectangular beam
Are curtailed if not required to resist the bending moment
Are bent up at suitable places to serve as shear reinforcement
Are bent down at suitable places to serve as shear reinforcement
Are maintained at bottom to provide at least local bond stress
Q.19
According to the steel beam theory of doubly reinforced beams
Tension is resisted by tension steel
Compression is resisted by compression steel
Stress in tension steel equals the stress in compression steel
All the above
Q.20
If the diameter of longitudinal bars of a square column is 16 mm, the diameter of lateral ties should not be less than
4 mm
5 mm
6 mm
8 mm
Q.21
The diameter of main bars in R.C.C. columns, shall not be less than
6 mm
8 mm
10 mm
12 mm
Q.22
The maximum diameter of a bar used in a ribbed slab, is
12 mm
6 mm
20 mm
22 mm
Q.23
If a bent tendon is required to balance a concentrated load W at the centre of the span L, the central dip h must be at least
WL/P
WL/2P
WL/3P
WL/4P
Q.24
A singly reinforced concrete beam of 25 cm width and 70 cm effective depth is provided with 18.75 cm² steel. If the modular ratio (m) is 15, the depth of the neutral axis, is
20 cm
25 cm
30 cm
35 cm
Q.25
The width of the flange of a T-beam, which may be considered to act effectively with the rib depends upon
Breadth of the rib
Overall thickness of the rib
Centre to centre distance between T-beams
All the above
Q.26
An R.C.C. lintel is spanning an opening of 2 m span in a brick wall. The height of the roof is 2.9 m above the floor level and that of the opening is 2.1 m above the floor level. The lintel is to be designed for self weight plus
Triangular load of the wall
UDL of wall
UDL of wall + load from the roof
Triangular load + load from the roof
Q.27
Minimum spacing between horizontal parallel reinforcement of the same size should not be less than
One diameter
2.5 diameters
3 diameters
3.5 diameters
Q.28
Minimum spacing between horizontal parallel reinforcement of different sizes, should not be less than
One diameter of thinner bar
One diameter of thicker bar
Twice the diameter of thinner bar
None of these
Q.29
A T-beam behaves as a rectangular beam of a width equal to its flange if its neutral axis
Remains within the flange
Remains below the slab
Coincides the geometrical centre of the beam
None of these
Q.30
An R.C.C. beam of 6 m span is 30 cm wide and has a lever arm of 55 cm. If it carries a U.D.L. of 12 t per m and allowable shear stress is 5 kg/cm², the beam
Is safe in shear
Is safe with stirrups
Is safe with stirrups and inclined bars
Needs revision of section
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