Civil Engineering MCQs

Page No. 293

Which of the following is the purest form of iron ?


acast iron


bwrought iron


cmild steel


d high carbon steel


View Answer wrought iron

The basic purpose of a retarder in concrete is_____________?


a to increase the initial setting time of cement paste in concrete


bto decrease the initial setting time of cement paste in concrete


cto render the concrete more water tight


d to improve the workability of concrete mix



The most commonly used retarder in cement is_________________?


agypsum


bcalcium chloride


ccalcium carbonate


dnone of the above


View Answer gypsum

The ultimate tensile strength of structural mild steel is about_________________?


a160N/mm2


b260N/mm2


c420 N/mm2


d520 N/mm2


View Answer 420 N/mm2

Which of the following cements contains maximum percentage of dicalcium silicate?


aordinary Portland cement


blow heat cement


crapid hardening cement


dsulphate resisting cement


View Answer low heat cement

Three basic raw materials which are needed in large quantities for production of steel are_______________?


airon ore, coal and sulphur


b iron ore, carbon and sulphur


ciron ore, coal and lime stone


diron ore, carbon and lime stone



Which of the following gradients exerts maximum influence on properties of steel?


airon


bcarbon


cmanganese


dsulphur


View Answer carbon

The most common admixture which is used to accelerate the initial set of concrete is______________?


agypsum


bcalcium chloride


ccalcium carbonate


dnone of the above


View Answer calcium chloride

The maximum quantity of calcium chloride used as an accelerator in cement in percentage by weight of cement is_______________?


a1


b2


c3


d4


View Answer 2

Which of the following cements is suitable for use in massive concrete structures such as large dams ?


aordinary Portland cement


blow heat cement


crapid hardening cement


dsulphate resisting cement


View Answer low heat cement

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