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Engineering Materials

Engineering Materials
Super conduction by metals is observed in the temperature range of

Below 10°K
Above 100°K
Around 100°C
Around 0°C

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Engineering Materials
Pearlite consists of

6.67% carbon and 93.33% iron
13% carbon and 87% ferrite
13% ferrite and 87% cementite
13% cementite and 87% ferrite

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Engineering Materials
The bond formed by transferring electrons from one atom to another is called

Covalent bond
None of these
Metallic bond
Ionic bond

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Engineering Materials
Gun metal contains

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

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Engineering Materials
Delta-iron occurs between the temperature ranges of

900°C to 1400°C
1400°C to 1530°C
600°C to 900°C
400°C to 600°C

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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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