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Engineering Materials

Engineering Materials
According to Indian standard specifications, plain carbon steel designated by 40 C8 means that the carbon content is

0.4 to 0.6%
0.6 to 0.8%
0.35 to 0.45%
0.0004

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Engineering Materials
The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is

770°C
1050°C
910°C
Below recrystallization temperature

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Engineering Materials
The crystal structure of brass is

Orthorhombic crystalline structure
F.C.C.
H.C.P.
C.C.

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Engineering Materials
The machinability of steel is increased by

Phosphorous and aluminium
Sulphur, graphite and aluminium
Silicon and sulphur
Phosphorous, lead and sulphur

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Engineering Materials
Quenching is not necessary when hardening is done by

Case hardening
Nitriding
Any one of these
Flame hardening

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Engineering Materials
Delta iron occurs at temperature of

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

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