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Engineering Materials

Engineering Materials
Eutectoid reaction occurs at

723°C
600°C
1493°C
1147°C

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Engineering Materials
When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.

Less than
None of these
More than
Equal to

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Engineering Materials
Gamma iron exits at following temperature

Between 1400°C and 1539°C
Near melting point
Between 910°C and 1400°C
Room temperature

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Engineering Materials
The ratio of the volume occupied by the atoms to the total volume of the unit cell is called

Coordination number
Atomic packing factor
None of these
Space lattice

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Engineering Materials
Process of Austempering results in

Martenistic structure
Lamellar layers of carbide distributed throughout the structure
Carburised structure
Formation of bainite structure

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Engineering Materials
Which of the following impurity in cast iron makes it hard and brittle?

Sulphur
Manganese
Phosphorus
Silicon

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