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

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

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Chemical Engineering Basics
Compression ratio of an I.C. engine is the ratio of the

Pressure after compression to that before compression
None of these
Clearance volume to the volume swept by piston per stroke
Volume of air in cylinder before compression to that after compression

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