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Engineering Materials

Engineering Materials
Crystal structure of a material is, generally, examined by

X-ray techniques
Naked eye
Metallurgical microscope
Optical microscope

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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
Sulphur in cast iron

Increases hardness and brittleness
Make the iron white and hard
Aids fusibility and fluidity
Makes the iron soft and easily machinable

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Engineering Materials
Gamma iron exits at following temperature

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

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Engineering Materials
Addition of copper to aluminium results in

One of the best known age and precipitation hardening systems
Improvement of corrosion resistance
Improvement of casting characteristics
Improving machinability

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Engineering Materials
Free cutting steels

Can be cut freely
Is used where rapid machining is the prime requirement
Require minimum cutting force
Contain carbon in free from

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