Concrete Technology and Design

81. For given workability the grading requiring the least amount of water is one that gives

  1. Greatest surface area for the given cement and aggregates
  2. Least surface area for the given cement and aggregates
  3. Least weight for the given cement and aggregates
  4. Greatest weight for the given cement and aggregates

Correct answer: (A)
Greatest surface area for the given cement and aggregates

82. For preparing a test-specimen, it is necessary

  1. To mix cement and fine aggregate by dry hand
  2. To mix coarse aggregates
  3. To mix water to the cement, fine aggregates and coarse aggregates
  4. All the above

Correct answer: (D)
All the above

83. For preparing ordinary concrete, the quantity of water used, is

  1. 5% by weight of aggregates plus 20% of weight of cement
  2. 10% by weight of aggregates plus 10% of weight of cement
  3. 5% by weight of aggregates plus 30% of weight of cement
  4. 30% by weight of aggregates plus 10% of weight of cement

Correct answer: (C)
5% by weight of aggregates plus 30% of weight of cement

84. For quality control of Portland cement, the test essentially done is

  1. Setting time
  2. Tensile strength
  3. Consistency
  4. All the above

Correct answer: (D)
All the above

85. For road pavements, the cement generally used, is

  1. Ordinary Portland cement
  2. Rapid hardening cement
  3. Low heat cement
  4. Blast furnace slag cement

Correct answer: (B)
Rapid hardening cement

86. For the construction of cement concrete dams, the maximum permissible size of the aggregates, is

  1. 40 mm
  2. 50 mm
  3. 60 mm
  4. 70 mm

Correct answer: (A)
40 mm

87. For the construction of cement concrete floor, the maximum permissible size of aggregate, is

  1. 4 mm
  2. 6 mm
  3. 8 mm
  4. 10 mm

Correct answer: (D)
10 mm

88. For the construction of R.C.C. slabs, columns, beams, walls, etc. the grade of concrete mix used, is

  1. 1 : 3 : 6
  2. 1 : 1½ : 3
  3. 1 : 2 : 4
  4. 1 : 1 : 2

Correct answer: (C)
1 : 2 : 4

89. For the construction of the retaining structures, the type of concrete mix to be used, is

  1. 1 : 3 : 6
  2. 1 : 2 : 4
  3. 1 : 1½ : 3
  4. 1 : 4 : 8

Correct answer: (C)
1 : 1½ : 3

90. For the construction of thin R.C.C. structures, the type of cement to be avoided, is

  1. Ordinary Portland cement
  2. Rapid hardening cement
  3. Low heat cement
  4. Blast furnace slag cement

Correct answer: (D)
Blast furnace slag cement

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