Concrete Technology and Design

111. If P, Y and Z are the weights of cement, fine aggregates and coarse aggregates respectively and W/C is the water cement ratio, the minimum quantity of water to be added to first batch, is obtained by the equation

1. 0.1P + 0.3Y + 0.1Z = W/C × P
2. 0.3P + 0.1Y + 0.01Z = W/C × P
3. 0.4P + 0.2Y + 0.01Z = W/C × P
4. 0.5P + 0.3Y + 0.01Z = W/C × P

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112. If the average compressive strength is 4000 kg/cm¹ and standard deviation is 500, the co-efficient of variation is

1. 10 %
2. 12.5 %
3. 15 %
4. 18.5 %

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113. If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called

1. Balanced beam
2. Under-reinforced beam
3. Over-reinforced beam
4. None of the above

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114. If the depth of moist sand in a cylinder is 15 cm and the depth of the sand when fully inundated with water is 12 cm, the bulking of the moist sand, is

1. 10 %
2. 12 %
3. 15 %
4. 25 %

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115. If the effective plan area of a warehouse is 54 sq. m, and maximum height of piles permitted is 270 cm, the number of cement bags to be stored, is

1. 2000 bags
2. 2200 bags
3. 2400 bags
4. 2700 bags

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116. If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer of 150 litre capacity, is

1. 15,900 litres
2. 16,900 litres
3. 17,900 litres
4. 18,900 litres

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117. If the engineer-in-charge approves, the 10 cm cubes may be used for the work test of concrete provided maximum nominal size of aggregate, does not exceed

1. 10 cm
2. 15 cm
3. 20 cm
4. 25 cm

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118. If the foundations of all the columns of a structure are designed on the total live and dead load basis, then

1. There will be no settlement of columns
2. There will be no differential settlement
3. The settlement of exterior columns will be more than interior columns
4. The settlement of interior columns will be more than exterior columns

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119. If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly reinforced rectangular balanced section will be

1. 0.35 d
2. 0.40 d
3. 0.45 d
4. Dependent on grade of concrete also

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120. If the size of panel in a flat slab is 6 m × 6 m, then as per Indian Standard Code, the widths of column strip and middle strip are

1. 3.0 m and 1.5 m
2. 1.5 m and 3.0 m
3. 3.0 m and 3.0 m
4. 1.5 m and 1.5 m

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