35) The process of heating steel to about 40 Degree Centigrade above the upper critical temperature and cooling it in still air to room temperature is known as

Hardening

Annealing

Normalizing

Tempering

Answer is:

Normalizing

Flame hardening

Case hardening

Nitriding

Induction hardening

Answer is:

increase the toughness

increase the softness

increase the hardness

increase the brittleness

Answer is:

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: