Engineering Materials
Gamma iron exits at following temperature

Room temperature
Between 910°C and 1400°C
Between 1400°C and 1539°C
Near melting point

ANSWER DOWNLOAD EXAMIANS APP

Engineering Materials
Carbon steel is

Made by adding carbon in steel
An alloy of iron and carbon with varying quantities of phosphorus and sulphur
Refined from cast iron
Extensively used for making cutting tools

ANSWER DOWNLOAD EXAMIANS APP

Engineering Materials
Smelting is the process of

All of these
Removing the impurities like clay, sand etc. from the iron ore by washing with water
Expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
Reducing the ore with carbon in the presence of a flux

ANSWER DOWNLOAD EXAMIANS APP

Engineering Materials
Ductile cast iron

Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in 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
Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Engineering Materials