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Engineering Materials

Engineering Materials
The machinability of steel is improved by adding

Sulphur, lead and phosphorus
Chromium
Nickel and chromium
Nickel

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Engineering Materials
An engineer's hammer is made of

High carbon steel
Cast iron
Forged steel
Mild steel

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Engineering Materials
Closed packed hexagonal space lattice is found in

Alpha-iron, tungsten, chromium and molybdenum
None of these
Zinc, magnesium, cobalt, cadmium, antimony and bismuth
Gamma-iron, aluminium, copper, lead, silver and nickel

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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
Fatigue strength is not high
Modulus of elasticity is fairly low

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Engineering Materials
Hardness of upper bainite (acicular structure) is about

RC 57
RC 65
RC 48
RC 80

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Engineering Materials
The hardness is the property of a material due to which it

Can be rolled or hammered into thin sheets
Breaks with little permanent distortion
Can be drawn into wires
Can cut another metal

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