Concrete Technology and Design

161. Normally pre-stressing wires are arranged in the

1. Upper part of the beam
2. Lower part of the beam
3. Center
4. Anywhere

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162. On a grading curve, the gap grading is represented by

1. A horizontal line
2. A vertical line
3. N.W. inclined line
4. N.E. inclined line

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163. Ordinary concrete is not used for concrete grade

1. M 100
2. M 150
3. M 250
4. M 400

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164. Ordinary Portland cement is manufactured from

1. Lime stone and clay
2. Gypsum and lime
3. Pozzolana
4. Lime, pozzolana and clay

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165. Particles of 0.002 mm size are that of

1. Clay
2. Sand
3. Gravel
4. None of these

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166. Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana cement, is

1. 30 %
2. 40 %
3. 50 %
4. 60 %

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167. Permissible compressive strength of M 150 concrete grade is

1. 100 kg/cm²
2. 150 kg/cm²
3. 200 kg/cm²
4. 250 kg/cm²

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168. Permissible compressive strength of M 200 concrete grade is

1. 100 kg/cm²
2. 150 kg/cm²
3. 200 kg/cm²
4. 250 kg/cm²

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169. Permissible compressive strength of M 300 concrete grade is

1. 100 kg/cm²
2. 150 kg/cm²
3. 200 kg/cm²
4. 300 kg/cm²

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170. Pick up the correct proportions of chemical ingredients of cement

1. Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3
2. Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3
3. Alumina : Silica : Lime : Iron oxide : 63 : 22 : 6 : 3
4. Iron oxide : Alumina : Silica : Lime : 63 : 22 : 6 : 3

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