37) In heat treatment process annealing is done to

increase the toughness

increase the softness

increase the hardness

increase the brittleness

Answer is:

increase the softness

Brittle

Ductile

Malleable

Tough

Answer is:

Increasing the percentage of carbon of the steel piece

Increasing the percentage of carbon of the core of the piece

Increasing the percentage of carbon on the surface

Decreasing the percentage of carbon of the steel piece

Answer is:

30 Degree Centigrade to 50 Degree Centigrade above the lower critical point

30 Degree Centigrade to 50 Degree Centigrade above the upper critical point

600 Degree Centigrade to 630 Degree Centigrade

1000 Degree Centigrade to 1030 Degree Centigrade

Answer is:

Sodium carbonate

Sodium sulphate

Sodium cyanide

Barium chloride

Answer is: