Concrete Technology and Design

221. The depth of footing for an isolated column is governed by
(i) Maximum bending moment
(ii) Shear force
(iii) Punching shear
The correct answer is

  1. Only (i)
  2. (i) and (ii)
  3. (i) and (iii)
  4. All (i), (ii) and (iii)

Correct answer: (D)
All (i), (ii) and (iii)

222. The design yield stress of steel according to IS: 4561978 is:

  1. 0.37 fy
  2. 0.57 fy
  3. 0.67 fy
  4. 0.87 fy

Correct answer: (D)
0.87 fy

223. The diameter of the Vicat plunger is 10 mm and its length varies from

  1. 20 mm to 30 mm
  2. 30 mm to 40 mm
  3. 40 mm to 50 mm
  4. 50 mm to 60 mm

Correct answer: (C)
40 mm to 50 mm

224. The diameter of ties in a column should be

  1. More than or equal to one fourth of diameter of main bar
  2. More than or equal to 5 mm
  3. More than 5 mm but less than one-fourth of diameter of main bar
  4. More than 5 mm and also more than one-fourth of diameter of main bar

Correct answer: (D)
More than 5 mm and also more than one-fourth of diameter of main bar

225. The dimensions of a 35 litre forma for measuring aggregates by volume, are:

  1. length 30 cm, breadth 25 cm, height 30 cm
  2. length 39 cm, breadth 25 cm, height 32 cm
  3. length 27 cm, breadth 27 cm, height 48 cm
  4. length 220 cm, breadth 25 cm, height 40 cm

Correct answer: (C)
length 27 cm, breadth 27 cm, height 48 cm

226. The effect of adding calcium chloride in concrete is
(i) To increase shrinkage
(ii)To decrease shrinkage
(iii) To increase setting time
(iv) To decrease setting time
The correct answer is

  1. (i) and (iii)
  2. (i) and (iv)
  3. (ii) and (iii)
  4. (ii) and (iv)

Correct answer: (B)
(i) and (iv)

227. The effect of creep on modular ratio is

  1. To decrease it
  2. To increase it
  3. Either to decrease or to increase it
  4. To keep it unchanged

Correct answer: (B)
To increase it

228. The entrained air in concrete

  1. Increases workability
  2. Decreases workability
  3. Decreases resistance to weathering
  4. Increases strength

Correct answer: (A)
Increases workability

229. The factor of safety for

  1. Steel and concrete are same
  2. Steel is lower than that for concrete
  3. Steel is higher than that for concrete
  4. None of the above

Correct answer: (B)
Steel is lower than that for concrete

230. The factor which affects workability, is

  1. Water content and its temperature
  2. Shape and size of the aggregates
  3. Air entraining agents
  4. All the above

Correct answer: (D)
All the above

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