RCC Sheet 47

1) Question.

The limitting moment of resistance for a singly reinforced beam using Fe250 steel and general grade concrete, is
Answer.
- 1
  
  $0.133 σ_{c k} b d^{2}$
- 2
  
  $0.135 σ_{c k} b d^{2}$
- 3
  
  $0.149 σ_{c k} b d^{2}$
- 4
  
  $0.138 σ_{c k} b d^{2}$
Answer: 3

Explanation:
2) Question.

The depth of neutral axis of a section 200 mm x 300 mm reinforced and 3 bars each of 20 mm diameter in tension and having characteristic strength of concrete and steel $15 N / m m^{2}$ and $250 N / m m^{2}$ respectively, is
Answer.
- 1
  
  159 mm
- 2
  
  169 mm
- 3
  
  179 mm
- 4
  
  190 mm
Answer: 1

Explanation:
3) Question.

The depth of neutral axis of a singly reinforced beam from the extreme compression fibre is:

where $α_{y}$ and $σ_{c k}$ are the characteristic strength of steel and concrete respectively and $A_{t}$ is the area of tension steel
Answer.
- 1
  
  $2.417 \frac{σ_{y} A_{t}}{σ_{c k} b}$
- 2
  
  $2.417 \frac{σ_{c k} A_{t}}{σ_{b} b}$
- 3
  
  $2.417 \frac{σ_{y} b}{σ_{c k} A_{t}}$
- 4
  
  $2.417 \frac{σ_{c k} b}{σ_{y} A_{t}}$
Answer: 1

Explanation:
4) Question.

Characteristic load on structure is defined as the load which has probability not being exceeded during the life time of the structure
Answer.
- 1
  
  85%
- 2
  
  90%
- 3
  
  95%
- 4
  
  None of these
Answer: 3

Explanation:
5) Question.

The characteristic strength $(α_{k})$ of concrete is usually referred to
Answer.
- 1
  
  5 days cube strength
- 2
  
  7 days cube strength
- 3
  
  21 days cube strength
- 4
  
  28 days cube strength
Answer: 4

Explanation:
6) Question.

The characteristic strength of steel is defined as the value of the strength of steel below which not more than
Answer.
- 1
  
  2% of the test results fail
- 2
  
  3% of the test results fail
- 3
  
  4% of the test results fail
- 4
  
  5% of the test results fail
Answer: 4

Explanation:
7) Question.

The depth of neutral axis of singly reinforced beam
Answer.
- 1
  
  decreases with the increases of characteristic strength of steel
- 2
  
  increases with the increases of characteristic strength of steel
- 3
  
  remains unaffected the change of characteristic strength of steel
- 4
  
  none of these
Answer: 1

Explanation:
8) Question.

The ratio of the limiting value of the depth of neutral axis and the depth of the section of a singly reinforced beam is equal to

where $σ_{y}$ is the characteristic strength and $E_{s}$ is the modulus of elasticity of steel
Answer.
- 1
  
  $\frac{0.0035}{0.0055 + 0.87 \frac{σ_{y}}{E_{s}}}$
- 2
  
  $\frac{0.0055}{0.0035 + 0.87 \frac{σ_{y}}{E_{s}}}$
- 3
  
  $\frac{0.0035}{0.0035 + 0.87 \frac{σ_{y}}{E_{s}}}$
- 4
  
  None of these
Answer: 1

Explanation:
9) Question.

In under reinforced singly reinforced beam, comcrete crushes at its maximum strain i.e.,
Answer.
- 1
  
  0.35%
- 2
  
  0.30%
- 3
  
  0.25%
- 4
  
  0.20%
Answer: 1

Explanation:
10) Question.

Yielding of steel in singly reinforced beam occurs in
Answer.
- 1
  
  balanced reinforced beam
- 2
  
  under-reinforced beam
- 3
  
  over reinforced beam
- 4
  
  none of these
Answer: 1

Explanation:
11) Question.

Tension failure occurs is singly reinforced beam in
Answer.
- 1
  
  balanced reinforced beam
- 2
  
  under-reinforced beam
- 3
  
  onver reinforced beam
- 4
  
  none of these
Answer: 2

Explanation:
12) Question.

Compression failure of simply reinforced beam occurs
Answer.
- 1
  
  balanced reinforced beam
- 2
  
  under-reinforced beam
- 3
  
  over reinforced beam
- 4
  
  none of these
Answer: 3

Explanation:
13) Question.

If the ratio of steel to concrete in a beam is such that maximum strain in both materials reach simultaneously, the beam is referred to
Answer.
- 1
  
  blanced reinforced beam
- 2
  
  under reinforced beam
- 3
  
  over reinforced beam
- 4
  
  none of these
Answer: 1

Explanation:
14) Question.

The maximum depth of neutral axis of singly reinforced beam is kept
Answer.
- 1
  
  half the depth of the cross section
- 2
  
  to ensure that tensile steel reaches its yield stress
- 3
  
  to ensure that tensile steel reaches its working stress
- 4
  
  at the centre of the tensile steel
Answer: 2

Explanation:
15) Question.

The distance between the lines of action of compression and tensile forces in a singly reinforced beam is called
Answer.
- 1
  
  effective depth
- 2
  
  lever aim
- 3
  
  neutral axis
- 4
  
  none of these
Answer: 2

Explanation:
16) Question.

The ratio of the distance of the line of action of forace of compression from the xtreme top fibre and the depth of the neutral axis from the extreme fbre is
Answer.
- 1
  
  0.32
- 2
  
  0.34
- 3
  
  0.38
- 4
  
  0.42
Answer: 4

Explanation:
17) Question.

If the partial safety factor on crecrete is 1.5, the design force of compression in the reinforced concrete beam is

where $b_{x}$ is the ara of compression block
Answer.
- 1
  
  $0.32 σ_{c k} b_{x}$
- 2
  
  $0.33 σ_{c k} b_{x}$
- 3
  
  $0.36 σ_{c k} b_{x}$
- 4
  
  $0.34 σ_{c k} b_{x}$
Answer: 3

Explanation:
18) Question.

The ratio of the force of compression in the parabolic stress block and their in rectangular stress block of a reinforced concrete beam at limit state collapse of a reinforced concrete beam at limit state collapse, is
Answer.
- 1
  
  0.8885
- 2
  
  0.8886
- 3
  
  0.8887
- 4
  
  0.8883
Answer: 1

Explanation:
19) Question.

The ratio of the depth of the parabolic and rectangular portion block at the limit state of collapse of a singly reinforced section is
Answer.
- 1
  
  1:2
- 2
  
  4:3
- 3
  
  3:4
- 4
  
  4:5
Answer: 2

Explanation:
20) Question.

Pick up the correct statement from the following:
Answer.
- 1
  
  At limit state of collapse, the residing moment on the section provided by the internal forces, is called the ultimate moment by resistance
- 2
  
  The entire section of the beam at limit state of collapse, above the neutral axis remains in compression
- 3
  
  The entire section of the beam at limit state of collapse, below the neutral axis remains intension and the concrete gets cracked
- 4
  
  All of these
Answer: 4

Explanation:

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