Which is false statement about case hardening? Case hardening is done by

Engineering Materials
Which is false statement about case hardening? Case hardening is done by

Nitriding

Electroplating

Cyaniding

Induction hardening

Nitriding

Electroplating

Cyaniding

Induction hardening

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Engineering Materials
Which is false statement about annealing? Annealing is done to

Soften material

Harden steel slightly

Relieve stresses

Improve machining characteristic

Soften material

Harden steel slightly

Relieve stresses

Improve machining characteristic

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Engineering Materials
Addition of silicon to aluminium results in

Improvement of casting characteristics

Improvement of corrosion resistance

One of the best known age and precipitation hardening systems

Improving machinability

Improvement of casting characteristics

Improvement of corrosion resistance

One of the best known age and precipitation hardening systems

Improving machinability

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Engineering Materials
White cast iron

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

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

Is produced by annealing process. It is soft, tough and easily machined metal

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

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

Is produced by annealing process. It is soft, tough and easily machined metal

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

Brittle fracture is always preceded by noise

Cup and cone formation is characteristic for brittle materials

Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture

High temperature and low strain rates favour brittle fracture

Brittle fracture is always preceded by noise

Cup and cone formation is characteristic for brittle materials

Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture

High temperature and low strain rates favour brittle fracture

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Engineering Materials
A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as

Precipitation

Heat treatment

Recrystallization

Allotropic change

Precipitation

Heat treatment

Recrystallization

Allotropic change

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Engineering Materials

Engineering Materials Which is false statement about case hardening? Case hardening is done by

Engineering Materials Which is false statement about annealing? Annealing is done to

Engineering Materials Addition of silicon to aluminium results in

Engineering Materials White cast iron

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

Engineering Materials A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as

Engineering Materials
Which is false statement about case hardening? Case hardening is done by

Engineering Materials
Which is false statement about annealing? Annealing is done to

Engineering Materials
Addition of silicon to aluminium results in

Engineering Materials
White cast iron

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

Engineering Materials
A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as