Engineering Materials
Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

Eutectic cast irons
None of these
Hypoeutectic cast irons
Hypereutectic cast irons

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Engineering Materials
Recrystallization temperature is one

At which crystals first start forming from molten metal when it is cooled
At which crystals grow bigger in size
At which change of allotropic form takes place
At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated

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Engineering Materials
Dow metal contains

90% aluminium and 90% copper
92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg
94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
90% magnesium and 9% aluminium with some copper

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