RCC Sheet 27

1) Question.

Pick up the incorrect statement from the following:

Tensile reinforcement bars of a rectangular beam
Answer.
- 1
  
  are curtailed if not required to resist the bending moment
- 2
  
  are bent up at suitable places to serve as shear reinforcement
- 3
  
  are bent down at suitable places to serve as shear reinforcement
- 4
  
  are maintained at bottom to provided at least local bond stress
Answer: 3

Explanation:
2) Question.

For M 150 mix concrete, according to I.S. specifications, local bond stress, is
Answer.
- 1
  
  $5 k g / c m^{2}$
- 2
  
  $10 k g / c m^{2}$
- 3
  
  $15 k g / c m^{2}$
- 4
  
  $25 k g / c m^{2}$
Answer: 2

Explanation:
3) Question.

In a beam the local bond stress $S_{b}$ is equal to
Answer.
- 1
  
  $\frac{S h e a r f o r c e}{L e v e r a r m x T o t a l p e r i m e t e r o f r e i n f o r c e m e n t}$
- 2
  
  $\frac{T o t a l p e r i m e t e r o f r e i n f o r c e m e n t}{L e v e r a r m x S h e a r f o r c e}$
- 3
  
  $\frac{L e v e r a r m}{S h e a r f o r c e x T o t a l p e r i m e t e r o f r e i n f o r c e m e n t}$
- 4
  
  $\frac{L e v e r a r m}{B e n d i n g m o m e n t x T o t a l p e r i m e t e r}$
Answer: 1

Explanation:
4) Question.

If the average bending stress is $6 k g / c m^{2}$ for M 150 grade concrete, the length of embedment of a bar of diameter d according to I.S. 456 specifications, is
Answer.
- 1
  
  28 d
- 2
  
  38 d
- 3
  
  48 d
- 4
  
  58 d
Answer: 4

Explanation:
5) Question.

If $S_{b}$ is the average bond stress on a bar of diameter d subjected to maximum stress t, the length of the embedment l is give by
Answer.
- 1
  
  $l = \frac{d t}{S_{b}}$
- 2
  
  $l = \frac{d t}{2 S_{b}}$
- 3
  
  $l = \frac{d t}{3 S_{b}}$
- 4
  
  $l = \frac{d t}{4 S_{b}}$
Answer: 4

Explanation:
6) Question.

The maximum shear stress (q) in concrete of a reinforced cement concrete beam is
Answer.
- 1
  
  $\frac{S h e a r f o r c e}{L e v e r a r m x W i d t h}$
- 2
  
  $\frac{L e v e r a r m}{S h e a r f o r c e x W i d t h}$
- 3
  
  $\frac{W i d t h}{L e v e r a r m x S h e a r f o r c e}$
- 4
  
  $\frac{S h e a r f o r c e x W i d t h}{L e v e r a r m}$
Answer: 1

Explanation:
7) Question.

Dimensions of a beam need be change if the shear sterss is more than
Answer.
- 1
  
  $10 k g / c m^{2}$
- 2
  
  $15 k g / c m^{2}$
- 3
  
  $20 k g / c m^{2}$
- 4
  
  $25 k g / c m^{2}$
Answer: 3

Explanation:
8) Question.

Spacing of stirrups in a rectangular beam, is
Answer.
- 1
  
  kept constant throughtout the length
- 2
  
  decreased towards the centre of the beam
- 3
  
  increased at the ends
- 4
  
  increased at the centre of the beam
Answer: 4

Explanation:
9) Question.

According to I.S.: 456 specifications, the safe diagonal tensile stress for M 150 grade concrete, is
Answer.
- 1
  
  $5 k g / c m^{2}$
- 2
  
  $10 k g / c m^{2}$
- 3
  
  $15 k g / c m^{2}$
- 4
  
  $25 k g / c m^{2}$
Answer: 1

Explanation:
10) Question.

Distribution of shear intensity over a rectangular section of a beam, following:
Answer.
- 1
  
  a circular curve
- 2
  
  a straight line
- 3
  
  a parabolic curve
- 4
  
  an elliptical curve
Answer: 3

Explanation:

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