Engineering Materials
Recrystallization temperature is one

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

ANSWER DOWNLOAD EXAMIANS APP

Engineering Materials
Duralumin contains

5 to 6% tin, 2 to 3% copper and rest aluminium
3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
4 to 4.5% magnesium, 3 to 4% copper and rest aluminium

ANSWER DOWNLOAD EXAMIANS APP

Engineering Materials
Malleable cast iron

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
Is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material
Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
Is produced by annealing process. It is soft, tough, and easily machined metal

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Engineering Materials