Concrete Technology and Design

241. The light weight aggregates are obtained from

  1. Sedimentary rocks
  2. Metamorphic rocks
  3. Igneous rocks
  4. Volcanic source

Correct answer: (D)
Volcanic source

242. The limits of percentage p of the longitudinal reinforcement in a column is given by

  1. 0.15% to 2%
  2. 0.8% to 4%
  3. 0.8% to 6%
  4. 0.8% to 8%

Correct answer: (C)
0.8% to 6%

243. The load carrying capacity of a helically reinforced column as compared to that of a tied column is about

  1. 5 % less
  2. 10 % less
  3. 5 % more
  4. 10 % more

Correct answer: (C)
5 % more

244. The load factors for live load and dead load are taken respectively as

  1. 1.5 and 2.2
  2. 2.2 and 1.5
  3. 1.5 and 1.5
  4. 2.2 and 2.2

Correct answer: (B)
2.2 and 1.5

245. The lower water cement ratio in concrete, introduces

  1. Smaller creep and shrinkage
  2. Greater density and smaller permeability
  3. Improved frost resistance
  4. All the above

Correct answer: (D)
All the above

246. The main object of compaction of concrete, is:

  1. To eliminate air holes
  2. To achieve maximum density
  3. To provide intimate contact between the concrete and embedded materials
  4. All the above

Correct answer: (D)
All the above

247. The main reason for providing number of reinforcing bars at a support in a simply supported beam is to resist in that zone

  1. Compressive stress
  2. Shear stress
  3. Bond stress
  4. Tensile stress

Correct answer: (C)
Bond stress

248. The main reinforcement in the heel of a T-shaped R.C. retaining wall is provided on

  1. Top face perpendicular to wall
  2. Bottom face perpendicular to wall
  3. Both top and bottom faces perpendicular to wall
  4. None of the above

Correct answer: (A)
Top face perpendicular to wall

249. The main reinforcement in the toe of a T-shaped R C. retaining wall is provided on
(i) Top face parallel to the wall
(ii) Top face perpendicular to the wall
(iii) Bottom face parallel to the wall
(iv) Bottom face perpendicular to the wall
The correct answer is

  1. Only (ii) is correct
  2. (i) and (ii) are correct
  3. (iii) and (iv) are correct
  4. Only (iv) is correct

Correct answer: (D)
Only (iv) is correct

250. The maximum amount of dust which may be permitted in aggregates is

  1. 5% of the total aggregates for low workability with a coarse grading
  2. 10% of the total aggregates for low workability with a fine grading
  3. 20% of the total aggregates for a mix having high workability with fine grading
  4. All the above

Correct answer: (D)
All the above

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