| 1. | The sum of the percentage of tricalcium silicate and dicalcium silicate for Portland cement varies from ? | |
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50 to 60%
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60 to 70%
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70 to 80%
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80 to 90%
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Report Question| 2. | The resistance of an aggregate to wear is known as ? | |
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shear value
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crushing value
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abrasion value
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impact value
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| 3. | Which of following proportion of different ingredients of concrete mix confirm to the arbitrary method of mixing ? | |
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1:2:5
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1:3:7
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1:4:8
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1:5:9
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| 4. | In the manufacture of pozzolana cement, the amount of pozzolana material added to ordinary Portland cement clinkers is about ? | |
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20%
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30%
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40%
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50%
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| 5. | Le-chatelier apparatus is used to perform ? | |
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fineness test
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soundness test
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consistency test
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compressive strength test
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| 6. | More water should not be added in the concrete mix, as to increase ? | |
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strength
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durability
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water-cement ratio
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all of these
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| 7. | In preliminary test, the concrete is placed in the mould in .......... layers of equal volume ? | |
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two
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three
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four
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five
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| 8. | The ordinary concrete is not used for ............. grade of concrete mix ? | |
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M 10
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M 20
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M 25
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M 40
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| 9. | The aggregate which pass through 4.75 mm IS sieve and entirely retain on 75 micron IS sieve called ? | |
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cyclopean aggregate
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coarse aggregate
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fine aggregate
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all in aggregate
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| 10. | The diameter of the pipe line used for transportation of concrete by pumps should not exceed ? | |
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10 cm
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20 cm
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30 cm
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40 cm
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