RCC Sheet 49

1) Question.

Thickness of slab is taken
Answer.
- 1
  
  0.10 d
- 2
  
  0.20 d
- 3
  
  0.15 d
- 4
  
  0.25 d
Answer: 2

Explanation:
2) Question.

If shear stresses generated exceed the shear strength of beam in which no shear strength is provided, cracks get formed at approximately $θ^{o}$ to the axis of the beam where $θ$ is
Answer.
- 1
  
  $25^{o}$
- 2
  
  $30^{o}$
- 3
  
  $45^{o}$
- 4
  
  $50^{o}$
Answer: 3

Explanation:
3) Question.

If the ratio of effective depth of compression steel and effective depth of tensile in double reinforced beam is 0.2, than
Answer.
- 1
  
  compression stress in steel = 0.87 fy
- 2
  
  compression stress in steel = 0.46 fck
- 3
  
  neither (a) nor (b)
- 4
  
  both (a) and (b)
Answer: 4

Explanation:
4) Question.

Pick up the incorrect statement from the following. In double reinforced beams,
Answer.
- 1
  
  steel is provided both on tension and compression sides
- 2
  
  the moment of resistance is the sum of limiting resistance of singly reinforced section and the additional moment given by compression steel
- 3
  
  the moment of resistance is the sum of limiting resistance of singly reinforced section, the addition moment given by compression steel and extra tensile steel
- 4
  
  none of these
Answer: 2

Explanation:
5) Question.

A double reinforced beam may be provided from structural point of view
Answer.
- 1
  
  structural point of view
- 2
  
  architectural point of view
- 3
  
  head room point of view
- 4
  
  all of these
Answer: 4

Explanation:
6) Question.

The maximum strain in the tension reinforcement in the section of flexural members shall not be less than

where $f_{y}$ is the characteristic strength of steel and $E_{s}$ is the modules of elasticity
Answer.
- 1
  
  $\frac{f_{y}}{E_{s}} + 0.002$
- 2
  
  $\frac{f_{y}}{1.15} E_{s} + 0.002$
- 3
  
  $1.15 \frac{f_{y}}{E_{s}} + 0.002$
- 4
  
  none of these
Answer: 2

Explanation:
7) Question.

For the design purposes of flexural members, the partial safety factor for stress in the reinforcment
Answer.
- 1
  
  $r_{m} = 1.5$
- 2
  
  $r_{m} = 1.15$
- 3
  
  $r_{m} = 1.25$
- 4
  
  $r_{m} = 1.35$
Answer: 2

Explanation:
8) Question.

The compression stress in concrete at the level of centroid of compression steel is equal to:

where $F_{c k}$ is the characteristic strenth of concrete
Answer.
- 1
  
  $0.446 F_{c k}$
- 2
  
  $0.416 F_{c k}$
- 3
  
  $0.36 F_{c k}$
- 4
  
  $0.57 F_{c k}$
Answer: 1

Explanation:
9) Question.

For the design of flexural members, the safety partial fact for compressive strenth
Answer.
- 1
  
  $r_{m} = 1.2$
- 2
  
  $r_{m} = 1.4$
- 3
  
  $r_{m} = 1.5$
- 4
  
  $r_{m} = 1.25$
Answer: 3

Explanation:
10) Question.

For design purposes of flexural members, the compressive strength of concrete is assumed to be
Answer.
- 1
  
  0.67 times the characteristic strength
- 2
  
  0.57 times the characteristic strength
- 3
  
  0.73 times the characteristic strength
- 4
  
  0.42 times the characteristic strength
Answer: 1

Explanation:
11) Question.

In over reinforced singly beam,
Answer.
- 1
  
  the concrete reaches its compressive strength before steel reaches its yielding stress
- 2
  
  the concrete fails when it has reached strain of 0.3 to 0.4%
- 3
  
  the failure occurs without visible signs
- 4
  
  all of these
Answer: 4

Explanation:
12) Question.

At the moment of the capacity of the beam:
Answer.
- 1
  
  the failure is gradual
- 2
  
  ten failure is preceded by the condensing of cracks
- 3
  
  there is sifnificant increase in deflection
- 4
  
  all of the above
Answer: 4

Explanation:
13) Question.

The capacity of a beam is determined by the load which causes:
Answer.
- 1
  
  cracks in tensile zone
- 2
  
  crushing of concrete in compression zone
- 3
  
  yielding of steel
- 4
  
  the shift of neutral axis
Answer: 3

Explanation:
14) Question.

When strains in compression zone of the concrete of a loaded singly reinforced beam, cause crushing of concrete, the failure is known as
Answer.
- 1
  
  primary compression failure
- 2
  
  secondary compression failure
- 3
  
  primary tensile failure
- 4
  
  secondary tensile failure
Answer: 2

Explanation:
15) Question.

Pick up the correct statement from the following. When a singly reinforced concrete beam loaded with gradually increasing load, and concrete develop cracks:
Answer.
- 1
  
  the cracks move upwards close to the neutral plane
- 2
  
  the neutral plane gradually shifts with further cracking
- 3
  
  the full tension is taken by steel
- 4
  
  all of these
Answer: 4

Explanation:
16) Question.

Pick up the correct statement form the
Answer.
- 1
  
  concrete is strong in compression
- 2
  
  concrete is very weak intension
- 3
  
  the modules of rupture of concrete is only a fraction of the compression strenth
- 4
  
  all of these
Answer: 4

Explanation:
17) Question.

If $f_{c k}$ = the characteristic compressive strength of concrete and axis the area of gross section of the member, the compression member is not checked if the member is subjected to a design axial load greater than
Answer.
- 1
  
  $F_{c k} A_{c}$
- 2
  
  $0.1 F_{c k} A_{c}$
- 3
  
  $0.2 F_{c k} A_{c}$
- 4
  
  $0.5 F_{c k} A_{c}$
Answer: 3

Explanation:
18) Question.

If $T_{v}$ is the nominal shear stress in beams of uniform depth (d), and breadth (b), subjected to shear force $V_{u}$ due to design load, then
Answer.
- 1
  
  $T_{v} = \frac{V_{u}}{b d}$
- 2
  
  $T_{v} = \frac{. 5 V_{u}}{b d}$
- 3
  
  $T_{v} = \frac{0.3 V_{u}}{b d}$
- 4
  
  $T_{v} = \frac{. 1 V_{u}}{b d}$
Answer: 1

Explanation:
19) Question.

If f = characteristic strength of the meteiral and $Y_{m}$ is apporpriate partical safety factor than the design strength of the material
Answer.
- 1
  
  $f d = \frac{f}{r m}$
- 2
  
  $f d = \frac{f}{r m}$
- 3
  
  $f d = \frac{3 f}{r m}$
- 4
  
  none of these
Answer: 1

Explanation:
20) Question.

If $a_{e r}$ = distance from the point considered to the surface of the nearest longitudinal bar, $C_{m i n}$ = minimum cover to the longitudinal bar, $C_{m i n}$ =minimum cover to the longitudinal bar, $σ_{μ}$ =average steel strain at the level considered, h= overall depth of the member and x = depth of the neutral axis in case of reinforced simply supp
Answer.
- 1
  
  $\frac{3 a_{c r} ε_{m}}{1 + \frac{2 (a_{c r} - C_{m i n})}{h - r}}$
- 2
  
  $\frac{3 C_{r} ε_{m}}{1 + \frac{2 (a_{c r} - C_{m i n})}{h + r}}$
- 3
  
  $\frac{2 a_{c r} ε_{m}}{1 + \frac{2 (a_{c r} - C_{m i n})}{h - r}}$
- 4
  
  $\frac{2 a_{c r} ε_{m}}{1 + \frac{2 (a_{c r} - C_{m i n})}{h + r}}$
Answer: 1

Explanation:

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