Engineering Materials MCQ with Answers

136) When a steel containing more than 0.8 percent carbon is cooled slowly below the lower critical pint, it consists of

Answer is:

pearlite and cementite

137) The purpose of heat treatment is to

Answer is:

any one of these

Explanation:

Heat treatment process effect on material structure and grains.
Most carbon steels and carbon alloy steels can be heat treated for the purpose of improving mechanical properties such as tensile and yield strength.
This is accomplished due to the heat treatment fundamentally altering the microstructure of the steel.

138) Normalizing of steel is done to

Answer is:

all of the above

Explanation:

Normalizing of steel is done to
* refine the grain structure
* remove strains caused by cold working
* remove dislocations caused in the internal structure due to hot working

139) the process which improves the machinability of steels, but lower the hardness and tensile strength is

Answer is:

spherodising

140) The hardness and tensile strength in austenitic stainless steel can be increased by

Answer is:

136) When a steel containing more than 0.8 percent carbon is cooled slowly below the lower critical pint, it consists of

pearlite and cementite

137) The purpose of heat treatment is to

any one of these

138) Normalizing of steel is done to

all of the above

139) the process which improves the machinability of steels, but lower the hardness and tensile strength is

spherodising

140) The hardness and tensile strength in austenitic stainless steel can be increased by

hardening and cold working