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Engineering Materials

Engineering Materials
Aluminium bronze contains aluminium and copper in the ratio of

40 : 60
0.47916666666667
2.5277777777778
2.1180555555556

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Engineering Materials
Cast iron is manufactured in

Open hearth furnace
Blast furnace
Bessemer converter
Cupola

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Engineering Materials
Which is false statement about properties of aluminium?

Modulus of elasticity is fairly low
Creep strength limits its use to fairly low temperatures
Fatigue strength is not high
Wear resistance is very good

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Engineering Materials
Bell metal contains

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

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Engineering Materials
Sulphur in steel

Acts as deoxidiser
Lowers the toughness and transverse ductility
Decreases tensile strength and hardness
Reduces the grain size

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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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