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Engineering Materials

Engineering Materials
In nodular iron, graphite is in the form of

Flakes
Spheroids
Free carbon
Cementite

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

None of these
Metallic bond
Covalent bond
Ionic bond

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Engineering Materials
Which is false statement about properties of aluminium?

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

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Engineering Materials
Corrosion resistance of steel is increased by addition of

Sulphur, phosphorus, lead
Vanadium, aluminium
Chromium and nickel
Tungsten, molybdenum, vanadium, chromium

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Engineering Materials
The percentage of carbon in grey iron castings usually varies between

0.012
5 to 7%
2.5 to 4.5%
0.5 to 1%

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Engineering Materials
Delta iron occurs at temperature of

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

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