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Engineering Materials

Engineering Materials
In high speed steels, manganese is used to tougher the metal and to increase its

Critical temperature
Melting point
Hardness
Yield point

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Engineering Materials
The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is

Nickel
Vanadium
Cobalt
Chromium

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Engineering Materials
Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio

50 : 20 : 20 : 10
50 : 20 : 10 : 20
30 : 20 : 30 : 20
40 : 30 : 20 : 10

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

Malleability
Plasticity
Brittleness
Ductility

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Engineering Materials
Bell metal contains

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

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Engineering Materials
Ball bearings are, usually, made from

Low carbon steel
Medium carbon steel
High carbon steel
Chrome steel

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