Concrete Technology and Design

131. In case of hand mixing of concrete, the extra cement to be added is

  1. 5 %
  2. 10 %
  3. 15 %
  4. 20 %

Correct answer: (B)
10 %

132. In counterfort retaining walls, the main reinforcement in the stem at support is

  1. Not provided
  2. Provided only on inner face
  3. Provided only on front face
  4. Provided both on inner and front faces

Correct answer: (B)
Provided only on inner face

133. In counterfort type retaining walls
(i) The vertical slab is designed as a continuous slab
(ii) The heel slab is designed as a continuous slab
(iii) The vertical slab is designed as a cantilever
(iv) The heel slab is designed as a cantilever
The correct answer is

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

Correct answer: (A)
(i) and (ii)

134. In order to obtain the best workability of concrete, the preferred shape of aggregate is

  1. Rounded
  2. Elongated
  3. Angular
  4. All of the above

Correct answer: (A)
Rounded

135. In pre-stressed concrete

  1. Forces of tension and compression change but lever arm remains unchanged
  2. Forces of tension and compressions remain unchanged but lever arm changes with the moment
  3. Both forces of tension and compression as well as lever arm change
  4. Both forces of tension and compression as well as lever arm remain unchanged

Correct answer: (B)
Forces of tension and compressions remain unchanged but lever arm changes with the moment

136. In reinforced concrete footing on soil, the minimum thickness at edge should not be less than

  1. 100 mm
  2. 150 mm
  3. 200 mm
  4. 250 mm

Correct answer: (B)
150 mm

137. In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for

  1. 20 times
  2. 25 times
  3. 30 times
  4. 50 times

Correct answer: (B)
25 times

138. In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively

  1. Compressive and tensile
  2. Tensile and compressive
  3. Both compressive
  4. Both tensile

Correct answer: (B)
Tensile and compressive

139. In the design of a front counterfort in a counterfort retaining wall, the main reinforcement is provided on
(i) Bottom face near counterfort
(ii) Top face near counterfort
(iii) Bottom face near centre of span
(iv) Top face near centre of span
The correct answer is

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

Correct answer: (C)
Both (i) and (iv)

140. In the method of voids for determination of the quantity of cement paste, it is assumed that

  1. Voids in coarse aggregates are filled by fine aggregates
  2. Voids in fine aggregates are filled by the cement paste
  3. Volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra
  4. All the above

Correct answer: (D)
All the above

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