Heat Treatment

What is the purpose of annealing in heat treatment?

• The purpose of annealing in heat treatment is to increase the melting point of metals.

• The purpose of annealing in heat treatment is to remove impurities from metals.

• The purpose of annealing in heat treatment is to soften metals and improve their ductility, toughness, and machinability.

• The purpose of annealing in heat treatment is to harden metals and make them more brittle.

Which heat treatment process involves heating a metal to a high temperature and then cooling it rapidly?

• normalising

• annealing

• hardening

• tempering

What is the main purpose of the hardening heat treatment?

• To reduce the material's hardness and strength.

• To prevent the material from cracking.

• To increase the material's ductility and toughness.

• To increase the materials hardness and strength.

Which heat treatment process involves heating a metal to a specific temperature and then cooling it slowly in a furnace?

• annealing

• normalizing

• tempering

• hardening

What is the purpose of tempering in heat treatment?

• To decrease the toughness of the steel.

• To increase the hardness of the steel.

• To prevent the steel from rusting.

• To improve toughness and ductility of hardened steel.

Which quenching medium cannot be used during a hardening heat treatment process?

• oil

• water

• brine

• air

Which quenching medium gives the most severe form of quenching (causes most rapid cooling)?

• brine
• water
• oil
• air

What is the main purpose of normalizing in heat treatment?

• To increase the hardness of the metal.

• To decrease the ductility of the metal

• To increase the brittleness of the metal.

• To refine the grain structure so that other heat treatments or mechanical processes can be carried out.

Which heat treatment process involves heating a metal to a temperature above its critical point and then allowing it to cool in air?

• tempering

• normalizing

• hardening

• annealing

What is the effect of annealing on the hardness of a metal?

• Annealing increases the hardness of a metal.

• Annealing has no effect on the hardness of a metal.

• Annealing makes the metal brittle.

• Annealing reduces the hardness of a metal.