Download Aptitude Crack
img not found img not found

Building Materials

Q1: For the manufacture of Portland cement, the proportions of raw materials used, are

A lime 63% ; silica 22% ; other ingredients 15%

B lime 22% ; silica 63% ; other ingredients 15%

C silica 40% ; lime 40% ; other ingredients 20%

D silica 70% ; lime 20% ; other ingredients 10%.

ANS:A - lime 63% ; silica 22% ; other ingredients 15%

Lime(CaO)---> 60-67%.
Silica(SiO2)---> 17-25%.
Aluminium(Al2O3)---> 3-8%.
Iron oxide (Fe2O3)---> 0.5-6%.
Magnesia(MgO)---> 0.1-4%.
Sulphur trioxide (SO3)---> 1-2%.
Soda and potash (Na2O+K2O)---> 0.5-1.3%.
Gypsum (CaSO4.2H2O)---> 3-4%.



img not found
img

For help Students Orientation
Mcqs Questions

One stop destination for examination, preparation, recruitment, and more. Specially designed online test to solve all your preparation worries. Go wherever you want to and practice whenever you want, using the online test platform.