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Engineering Materials

Engineering Materials
The property of a material which enables it to retain the deformation permanently, is called

Ductility
Plasticity
Brittleness
Malleability

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Engineering Materials
Sulphur in cast iron

Make the iron white and hard
Makes the iron soft and easily machinable
Aids fusibility and fluidity
Increases hardness and brittleness

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Engineering Materials
The surface hardness of the following order is achieved by nitriding operation

600 VPN
1500 VPN
250 VPN
1000 to 1100 VPN

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Engineering Materials
The electric process of steel making is especially adapted to

High speed tool steel
All of these
Magnet steel
Alloy and carbon tool steel

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Engineering Materials
The machinability of steel is increased by

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

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Engineering Materials
Bronze contains

70% copper and 30% zinc
90% copper and 10% tin
85 - 92% copper and rest tin with little lead and nickel
70 - 75% copper and rest tin

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