Engineering Materials
Addition of lead and bismuth to aluminium results in

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

ANSWER DOWNLOAD EXAMIANS APP

Engineering Materials
Grey cast iron

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

ANSWER DOWNLOAD EXAMIANS APP

Engineering Materials
Pick up wrong statement about wrought iron

It contains carbon of the order of 0 to 0.25%
It is very soft and ductile
It melts at 1535°C
It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Engineering Materials