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

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Chemical Engineering Basics
Which of the following is not a characteristic observed in material failure by fatigue fracture ?

Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface
Initiation of crack from below the surface does not occur
Initation of crack occurs on the surface of the machine part
Plastic deformation of material does not occur

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