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Engineering Materials

Engineering Materials
Which of the following impurity in cast iron makes it hard and brittle?

Phosphorus
Manganese
Silicon
Sulphur

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Engineering Materials
The hardness of steel primarily depends on

Shape of carbides and their distribution in iron
Percentage of alloying elements
Heat treatment employed
Percentage of carbon

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Engineering Materials
Which is false statement about tempering? Tempering is done to

Improve machinability
Improve ductility
Improve toughness
Release stresses

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Engineering Materials
Wrought iron

Is a ductile material
All of these
Can be easily forged or welded
Cannot stand sudden and excessive shocks

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Engineering Materials
Age hardening is related to

Silver
Copper
Duralumin
Brass

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Engineering Materials
Body centered cubic space lattice is found in

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

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