Engineering Materials MCQ with Answers

136) Carbon steel is

Answer is:

an alloy of iron and carbon with varying quantities of phosphorus and sulphur

137) Annealing of white cast iron results in production of

Answer is:

malleable iron

138) ′Killed steels′ are those steels

Answer is:

which are deoxidised in the ladle with silicon and aluminium

Explanation:

When steel has been fully deoxidized before casting and no gas was evolved during solidification, the resultant steel is known as killed steel. It is combined with an agent like casting before use. This steel is called "killed" because it quietly solidifies in the mold and no gas evolves.

139) Hardness of steel depends on

Answer is:

the shape and distribution of the car-bides in iron

140) Maximum percentage of carbon in ferrite is

Answer is:

136) Carbon steel is

an alloy of iron and carbon with varying quantities of phosphorus and sulphur

137) Annealing of white cast iron results in production of

malleable iron

138) ′Killed steels′ are those steels

which are deoxidised in the ladle with silicon and aluminium

139) Hardness of steel depends on

the shape and distribution of the car-bides in iron

140) Maximum percentage of carbon in ferrite is

0.0003