Engineering Materials
Induction hardening is the process of

Heating and cooling rapidly
Increasing hardness throughout
Inducing hardness by continuous process
Hardening surface of work-piece to obtain hard and wear resistant surface

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Engineering Materials
Ductile cast iron

Is produced by annealing process. It is soft, tough and easily machined metal
Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

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Engineering Materials
Which of the following statement is true about brittle fracture?

High temperature and low strain rates favour brittle fracture
Cup and cone formation is characteristic for brittle materials
Brittle fracture is always preceded by noise
Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture

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