Chemical Engineering Basics
Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of portland cement. The component of Portland cement which first hardens is

3CaO . Al2O₃
3CaO . SiO₂
5CaO . 3 Al2O₃
2CaO . SiO₂

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Chemical Engineering Basics
Which of the following are made out of the carbon steel having carbon content of 0.9 to 1% ?

Small punches, broaches reamers and springs
Cutlery, screws, rivets and files
Forgings like can shaft, structural steel plate, threading dies and drawing dies
Mandrels, twist drills, small lathe tools and razors

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