RCC Sheet 45

1) Question.

If $A_{c}$ , $A_{s c}$ and A ae areas of concrete, longitudinal steel and section of a R.C.C. column and m and $σ_{c}$ are the modular ratio and maximum stress in the configuration of concrete, the strength of column is
Answer.
- 1
  
  $σ_{c} A_{c} + m σ_{c} A_{s c}$
- 2
  
  $σ_{c} (A - A_{s c}) + m σ_{c} A_{s c}$
- 3
  
  $σ_{c} [A + (m - 1) A_{s c}]$
- 4
  
  all the above
Answer: 4

Explanation:
2) Question.

If the effective length of a 32 cm diameter R.C.C. column is 4.40 m, its slenderness ratio, is
Answer.
- 1
  
  40
- 2
  
  45
- 3
  
  50
- 4
  
  55
Answer: 4

Explanation:
3) Question.

An R.C.C. column is treated as long if its slenderness ratio is greater than
Answer.
- 1
  
  30
- 2
  
  35
- 3
  
  40
- 4
  
  50
Answer: 4

Explanation:
4) Question.

An R.C.C. column is treated as short column if its slenderness ratio is less than
Answer.
- 1
  
  30
- 2
  
  35
- 3
  
  40
- 4
  
  50
Answer: 4

Explanation:
5) Question.

Pick up the correct statement from the
Answer.
- 1
  
  Lateral reinforcement in R.C.C. columns is provided to prevent the longitudinal reinforcement from buckling
- 2
  
  Lateral reinforcement prevents the shearing of concrete on diagonal plane
- 3
  
  Lateral reinforcement stops breaking away of concrete cover, due to buckling
- 4
  
  All the above
Answer: 4

Explanation:
6) Question.

The diameter of main bars in R.C.C. columns, shall not be less than
Answer.
- 1
  
  6 mm
- 2
  
  8 mm
- 3
  
  10 mm
- 4
  
  12 mm
Answer: 4

Explanation:
7) Question.

The steel generally used in R.C.C. work, is
Answer.
- 1
  
  stainless
- 2
  
  mildsteel
- 3
  
  high carbon steel
- 4
  
  high tension steel
Answer: 2

Explanation:
8) Question.

The minimum clear cover for R.C.C. columns shall be
Answer.
- 1
  
  greater of 40 mm or diameter
- 2
  
  smaller of 40 mm or diameter
- 3
  
  greater of 25 mm or diameter
- 4
  
  smaller of 25 mm or diameter
Answer: 3

Explanation:
9) Question.

An R.C.C. lintel is spanning an opening of 2 m span in a brick wall. The height of the roof is 2.9 m above the floor level and that of the opening is 2.1 m above the floor level. The lintel is to be designed for self weight plus
Answer.
- 1
  
  triangular load of the wall
- 2
  
  UDL of wall
- 3
  
  UDL of wall + load from the roof
- 4
  
  triangular load + load from the roof
Answer: 3

Explanation:
10) Question.

Steel beam theory is used for
Answer.
- 1
  
  design of simple steel beams
- 2
  
  steel beams encased in concrete
- 3
  
  doubly reinforced beams ignoring compressive stress in concrete
- 4
  
  beams if shear exceeds 4 times allowable shear stress
Answer: 3

Explanation:
11) Question.

Design of R.C.C. cantilever beams, is based on the resultant force at
Answer.
- 1
  
  fixed end
- 2
  
  free end
- 3
  
  mid span
- 4
  
  mid apan and fixed support
Answer: 2

Explanation:
12) Question.

Design of R.C.C. simply supported beams carrying U.D.L. is based on the resultant B.M. at
Answer.
- 1
  
  supports
- 2
  
  mid span
- 3
  
  every section
- 4
  
  quarter span
Answer: 4

Explanation:
13) Question.

The minimum number of main steel bars provided in R.C.C.
Answer.
- 1
  
  rectangular columns is 4
- 2
  
  circular columns is 6
- 3
  
  octagonal columns is 8
- 4
  
  all the above
Answer: 4

Explanation:
14) Question.

The allowable tensile stress in mild steel stirrups, reinforced cement concrete, is
Answer.
- 1
  
  $1400 k g / c m^{2}$
- 2
  
  $190 k g / c m^{2}$
- 3
  
  $260 k g / c m^{2}$
- 4
  
  $230 k g / c m^{2}$
Answer: 1

Explanation:
15) Question.

In previous Quention above if F=4000 kg, M = 2000 kg.m, d = 20 cm, $l_{a} = 18 c m$ , O = 6 cm, the spacing of 2 legged 12 mm $ϕ$ stirrups of mild steel $(f_{c} = 1400 k g / m^{2})$ should be
Answer.
- 1
  
  100 mm
- 2
  
  140 mm
- 3
  
  170 mm
- 4
  
  260 mm
Answer: 1

Explanation:
16) Question.

If bending moment is M, shear force is F effective depth is d, lever arm is $l_{a}$ area of reinforcement is $A_{s}$ and sum of the circumferences of main reinforcement is O, the bond stress beased on working stress methods, is
Answer.
- 1
  
  $\frac{F}{l_{a} O}$
- 2
  
  $\frac{M}{l_{a} A_{s}}$
- 3
  
  $\frac{M}{d O}$
- 4
  
  $\frac{F}{A_{a} . d}$
Answer: 1

Explanation:
17) Question.

An R.C.C. roof slab is designed as a two way slab it
Answer.
- 1
  
  it supports live loads in both directions
- 2
  
  the ratio of spans in two directions is less than 2
- 3
  
  the slab is continuous over two supports
- 4
  
  the slab is discontinuous at edges
Answer: 2

Explanation:
18) Question.

A simply supported beam .6 m long and of effective depth 50 cm, carries a uniformly distributed load 2400 kg/m including its self weight. If the lever arm factor is 0.85 and permissible tensile stress of steel is $1400 k g / m^{2}$ , the area of steel required, is
Answer.
- 1
  
  $14 c m^{2}$
- 2
  
  $15 c m^{2}$
- 3
  
  $16 c m^{2}$
- 4
  
  $17 c m^{2}$
Answer: 3

Explanation:
19) Question.

The live load to be considered for an inacessible roof, is
Answer.
- 1
  
  Nil
- 2
  
  $75 k g / m^{2}$
- 3
  
  $150 k g / m^{2}$
- 4
  
  $200 k g / m^{2}$
Answer: 2

Explanation:
20) Question.

A reinforced concrete cantilever beam is 3.6 m long, 25 cm wide and has its lever arm 40 cm. It carries a load of 1200 kg at its free end and vertical strrups can carry 1800 kg. Assuming concrete to carry one-third of thediagonal tension and ignoring the weight of the beam, the number of shear stirrups required, is
Answer.
- 1
  
  30
- 2
  
  35
- 3
  
  40
- 4
  
  45
Answer: 3

Explanation:

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