RCC Sheet 33

1) Question.

If the ratio of long and short spans of a two way slab with corners held down is r, the actual reduction of B.M. is given by
Answer.
- 1
  
  $\frac{5}{6} \frac{r}{1 + r^{2}} M$
- 2
  
  $\frac{5}{6} \frac{r^{2}}{1 + r^{2}} M$
- 3
  
  $\frac{5}{6} \frac{r^{2}}{1 + r^{3}} M$
- 4
  
  $\frac{5}{6} \frac{r^{2}}{1 + r^{4}} M$
Answer: 4

Explanation:
2) Question.

If $l_{1}$ and $l_{2}$ are the lengths of long and short spans of a two way slab simply supported on four edges and carrying a loaw w per unit area, the ratio of the loads split into $w_{1}$ and $w_{2}$ acting on strips parallel to $l_{2}$ and $l_{1 <}$
Answer.
- 1
  
  $\frac{w_{1}}{w_{2}} = \frac{l_{2}}{l_{1}}$
- 2
  
  $\frac{w_{1}}{w_{2}} = {(\frac{l_{2}}{l_{1}})}^{2}$
- 3
  
  $\frac{w_{1}}{w_{2}} = {(\frac{l_{2}}{l_{1}})}^{3}$
- 4
  
  $\frac{w_{1}}{w_{2}} = {(\frac{l_{2}}{l_{1}})}^{4}$
Answer: 4

Explanation:
3) Question.

If K is constant depending upon the ratio of the width of the slab to its effective span l, x is the distance of the concentrated load from the nearer support, bw is the width of the area of contact of the concentrated load measured parallel to the supported enge, the effective width of the slab be is
Answer.
- 1
  
  $\frac{K}{x} (1 + \frac{x}{d}) + b w$
- 2
  
  $K x (1 - \frac{x}{l}) + b w$
- 3
  
  $K x (1 + \frac{x}{l}) - b w$
- 4
  
  $K x (1 + \frac{x}{l}) + b w$
Answer: 2

Explanation:
4) Question.

If the length of an intermediate span of a continuous slab is 5m, the length of the end span is kept
Answer.
- 1
  
  4.5 m
- 2
  
  4.0 m
- 3
  
  3.5 m
- 4
  
  3.0 m
Answer: 1

Explanation:
5) Question.

For a continuous floor slab supported on beams, the ratio of end span length and intermediate span length, is
Answer.
- 1
  
  0.6
- 2
  
  0.7
- 3
  
  0.8
- 4
  
  0.9
Answer: 4

Explanation:
6) Question.

For a continuous slab supported at ends and carried over intermediate beams,
Answer.
- 1
  
  Max. sagging B.M. for th end spans = $\frac{w l^{2}}{10}$
- 2
  
  Max. hogging B.M. over penultimate supports = $- \frac{w l^{2}}{10}$
- 3
  
  max. sagging B.M. for the interior spans = $+ \frac{w l^{2}}{12}$
- 4
  
  All of the above
Answer: 4

Explanation:
7) Question.

If the permissible compressive stress for a concrete in bending is $C k g / m^{2}$ , the modular ratio is
Answer.
- 1
  
  2800/C
- 2
  
  2300/2C
- 3
  
  2800/3C
- 4
  
  $2800 / C^{2}$
Answer: 3

Explanation:
8) Question.

The weight of reinforced concrete, is generally taken as
Answer.
- 1
  
  $2200 k g / m^{3}$
- 2
  
  $2300 k g / m^{3}$
- 3
  
  $2400 k g / m^{3}$
- 4
  
  $2500 k g / m^{3}$
Answer: 3

Explanation:
9) Question.

If tghe diameter of the main reinforcement in a slab is 16 mm, the concrete cover to main bars is
Answer.
- 1
  
  12 mm
- 2
  
  13 mm
- 3
  
  14 mm
- 4
  
  16 mm
Answer: 4

Explanation:
10) Question.

The transverse reinforcements provided at right angles to the main reinforcement
Answer.
- 1
  
  distribute the load
- 2
  
  resist the temperature stresses
- 3
  
  resist the shrinkage stress
- 4
  
  all the above
Answer: 4

Explanation:

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