Practice Test: Question Set - 08
1. The ratio of the breadth to effective depth of a beam is kept
- (A) 0.25
- (B) 0.50
- (C) 0.70
- (D) 0.75
2. In a cantilever retaining wall without a heel slab
- (A) Thickness
of the stem is kept same throughout
- (B) Base
slab is made 10 cm thicker than the stem
- (C) Width
of the base slab is kept 0.7 time the total height of the wall
- (D) All
the above
3. ‘P’ is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is ‘A’ and sectional modulus is ‘Z’. The maximum stress ‘f’ in the beam, subjected to a maximum bending moment ‘M’, is
- (A) f = (P/A)
+ (Z/M)
- (B) f = (A/P)
+ (M/Z)
- (C) f = (P/A)
+ (M/Z)
- (D) f = (P/A)
+ (M/6Z)
4. A T-beam behaves as a rectangular beam of a width equal to its flange if its neutral axis
- (A) Remains
within the flange
- (B) Remains
below the slab
- (C) Coincides
the geometrical centre of the beam
- (D) None of
these
5. For the design of a simply supported T-beam the ratio of the effective span to the overall depth of the beam is limited to
- (A) 10
- (B) 15
- (C) 20
- (D) 25
6. A reinforced concrete cantilever beam is 3.6 m long, 25 cm wide and has its lever arm 40 cm. It carries a load of 1200 kg at its free end and vertical stirrups can carry 1800 kg. Assuming concrete to carry one-third of the diagonal tension and ignoring the weight of the beam, the number of shear stirrups required, is
- (A) 30
- (B) 35
- (C) 40
- (D) 45
7. The width of the rib of a T-beam, is generally kept between
- (A) 1/7 to 1/3
of rib depth
- (B) 1/3
to 1/2 of rib depth
- (C) 1/2 to 3/4
of rib depth
- (D) 1/3 to 2/3
of rib depth
8. A ribbed slab is provided for
- (A) A plain
ceiling
- (B) Thermal
insulation
- (C) Acoustic
insulation
- (D) All the
above
9. To ensure that the hogging bending moment at two points of suspension of a pile of length L equals the sagging moment at its centre, the distances of the points of suspension from either end, is
- (A) 0.107 L
- (B) 0.207 L
- (C) 0.307 L
- (D) 0.407 L
10. The stresses developed in concrete and steel in reinforced concrete beam 25 cm width and 70 cm effective depth, are 62.5 kg/cm2 and 250 kg/cm2 respectively. If m = 15, the depth of its neutral axis is
- (A) 20 cm
- (B) 25 cm
- (C) 30 cm
- (D) 35 cm
11. If the depth of actual neutral axis of a doubly reinforced beam
- (A) Is
greater than the depth of critical neutral axis, the concrete attains its
maximum stress earlier
- (B) Is less than
the depth of critical neutral axis, the steel in the tensile zone attains its
maximum stress earlier
- (C) Is
equal to the depth of critical neutral axis; the concrete and steel attain
their maximum stresses simultaneously
- (D) All
the above
12. If the modular ratio is ‘m’, steel ratio is ‘r’ and overall depth of a beam is ‘d’, the depth of the critical neutral axis of the beam, is
- (A) [m/(m
- r)] d
- (B) [m/(m
+ r)] d
- (C) [(m +
r)/m] d
- (D) [(r -
m)/m] d
13. The maximum diameter of a bar used in a ribbed slab, is
- (A) 12 mm
- (B) 6 mm
- (C) 20 mm
- (D) 22 mm
14. A column is regarded as long column if the ratio of its effective length and lateral dimension, exceeds
- (A) 10
- (B) 15
- (C) 20
- (D) 25
15. According to the steel beam theory of doubly reinforced beams
- (A) Tension
is resisted by tension steel
- (B) Compression
is resisted by compression steel
- (C) Stress
in tension steel equals the stress in compression steel
- (D) All
the above
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