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Engineering Materials

Engineering Materials
Drop forging dies contain carbon of the order of

0.6 to 0.7%
0.25 to 0.5%
0.1 to 0.2%
0.7 to 0.9%

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Engineering Materials
When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces

Alloy cast iron
Malleable cast iron
White cast iron
Nodular cast iron

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Engineering Materials
Shock resisting steels should have

Low hardness
Low tensile strength
Toughness
Low wear resistance

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Engineering Materials
Delta iron occurs at temperature of

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

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Engineering Materials
Bell metal contains

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

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Engineering Materials
Quenching is not necessary when hardening is done by

Any one of these
Nitriding
Case hardening
Flame hardening

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