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Engineering Materials

Engineering Materials
Which of the following material has maximum ductility?

Nickel
Aluminium
Mild steel
Copper

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Engineering Materials
Sulphur in steel

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

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Engineering Materials
In grey cast iron, carbon is present in the form of

Cementite
Spheroids
Flakes
Free carbon

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

Silicon
Manganese
Phosphorus
Sulphur

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Engineering Materials
Gun metal contains

70 - 78% copper and rest tin
70% copper and 30% zinc
85 - 92% copper and rest tin with little lead and nickel
90% copper and 10% tin

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Engineering Materials
In the lower part of the blast furnace (zone of fusion), the temperature is

1200°C to 1300°C
800°C to 1000°C
1500°C to 1700°C
400° to 700°C

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