Chemical Engineering Basics
Oxygen cylinders used for autogenous (cutting/welding) purposes are

Welded steel cylinders
Heat treated before use
Seamless & made of steel
Made by sand casting

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

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

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