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Engineering Materials

Engineering Materials
The percentage of carbon in grey iron castings usually varies between

5 to 7%
0.5 to 1%
2.5 to 4.5%
0.012

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Engineering Materials
A material is said to be allotropic, if it has

Fixed structure at all temperatures
Different crystal structures at different temperatures
Any one of the above
Atoms distributed in random pattern

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Engineering Materials
Process of Austempering results in

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

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Engineering Materials
In low carbon steels, ________ raises the yield point and improves the resistance to atmospheric corrosion.

Sulphur
Phosphorus
Manganese
Silicon

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Engineering Materials
The machinability of steel is improved by adding

Sulphur, lead and phosphorus
Chromium
Nickel
Nickel and chromium

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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.

None of these
Less than
Equal to
More than

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