RCC Sheet 25

1) Question.

The section of a reinforced beam where most distant concrete fibre in compression and tension in steel attains permissible stresses simultaneously, is called
Answer.
- 1
  
  balanced section
- 2
  
  economic section
- 3
  
  critical section
- 4
  
  all the above
Answer: 4

Explanation:
2) Question.

A singly reinforced beam has breadth b, effective depth d, depth of neutral axis n and critical neutral axis $n_{1}$ . If $f_{c}$ and $f_{t}$ are permissible compressive and tensile stresses, the moment to resistance of the beam, is
Answer.
- 1
  
  $b n \frac{f_{c}}{2} (d - \frac{n}{3})$
- 2
  
  $A t f_{t} (d - \frac{n}{3})$
- 3
  
  $\frac{1}{2} n_{1} (1 - \frac{n_{1}}{3}) c b d^{2}$
- 4
  
  all the above
Answer: 4

Explanation:
3) Question.

If d and n are the effective depth and depth of the neutral axis respectively of a singley reinforced beam, the lever arm of the beam, is
Answer.
- 1
  
  d
- 2
  
  n
- 3
  
  $d + \frac{n}{3}$
- 4
  
  $d - \frac{n}{3}$
Answer: 4

Explanation:
4) Question.

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
Answer.
- 1
  
  $\frac{m}{m - r} d$
- 2
  
  $\frac{m}{m + r} d$
- 3
  
  $\frac{m + r}{m} d$
- 4
  
  $\frac{r - m}{m} d$
Answer: 2

Explanation:
5) Question.

In a singly reinforced beam, the effective depth is measured from its compression edge to
Answer.
- 1
  
  tensile edge
- 2
  
  tensile reinforcement
- 3
  
  neutral axis of the beam
- 4
  
  longitudinal central axis
Answer: 2

Explanation:
6) Question.

In a singly reinforced beam
Answer.
- 1
  
  compression is borne entirely by concrete
- 2
  
  steel possesses initial stresses when embeded in concrete
- 3
  
  plane sections transverse to the centre line of the beam before bending remain plane after bending
- 4
  
  elastic modulii for concrete and steel have different values within the limits of deformation of the beam
Answer: 3

Explanation:
7) Question.

The advantage of reinforced concrete, is due to
Answer.
- 1
  
  monolithic character
- 2
  
  fire-resistiing and durability
- 3
  
  economy because of less maintence cost
- 4
  
  All the above
Answer: 4

Explanation:
8) Question.

The length of a combined footing for two columns is L, the centre to centre distance between the columns is l, and the distance of centre of gravity of the column loads from the centre of left hand column is $x$ . In order to have uniformly distributed load on the footing, the projection ( $a_{2}$ ) on the right hand side of the column is
Answer.
- 1
  
  $a_{2} = \frac{L}{2} + (l - x)$
- 2
  
  $a_{2} = \frac{L}{2} - (l - x)$
- 3
  
  $a_{2} = L + (l - x)$
- 4
  
  $a_{2} = L - (l - x)$
Answer: 2

Explanation:
9) Question.

According to Grashoff-Rankine theory for a two-way slab
Answer.
- 1
  
  $\frac{W_{L}}{W_{B}} = \frac{B}{L}$
- 2
  
  $\frac{W_{L}}{W_{B}} = {(\frac{B}{L})}^{2}$
- 3
  
  $\frac{W_{L}}{W_{B}} = {(\frac{B}{L})}^{3}$
- 4
  
  $\frac{W_{L}}{W_{B}} = {(\frac{B}{L})}^{4}$
Answer: 4

Explanation:
Where L = Long span of a slab

B = Short span of a slab

$W_{L}$ = Load carried by the slab in the direction of long span, and

$W_{B}$ = Load carried by the slab in the direction of short span
10) Question.

According to the load factor method, the permissible load (W) on a short column reinforced width longitudinal bars and lateral stirrups, is equal to
Answer.
- 1
  
  $σ_{c b} . A_{c}$
- 2
  
  $σ_{s t} . A_{t}$
- 3
  
  $σ_{c b} . A_{c} + σ_{s t} . A_{t}$
- 4
  
  $σ_{s t} . A_{c} + σ_{c b} . A_{t}$
Answer: 3

Explanation:
Where $σ_{c b} a n d σ_{s t}$ = Stress in concrete and steel respectively, and

$A_{c} a n d A_{t}$ = Area of concrete and steel respectively

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