Engineering Materials MCQ with Answers

contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron

is also known as chilled cast iron am is obtained by cooling rapidly. It i: almost unmachinable

is produced by annealing process. I is soft, tough and easily machinec metal

is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroida form and is well dispersed throughout the material

high machinability

low melting point

high tensile strength

all of the above.

improves wear resistance, cutting ability and toughness

refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant proper¬ties

improves cutting ability and reduces hardenability

gives ductility, toughness, tensile strength and anticorrosion properties

copper

chromium

nickel

silicon

it easily machinable

it brittle

it hard

the casting unsound