mcq2-14

What is the primary purpose of hardening steel through heat treatment?

• To soften the steel
• To improve machinability
• To increase wear resistance
• To relieve strain and stress

Which structure is formed in steel when heated to a high temperature and then cooled rapidly?

• Ferrite
• Cementite
• Pearlite
• Martensite

What is the primary purpose of tempering steel after hardening?

• To make it non-magnetic
• To add cutting ability
• To remove extreme brittleness
• To increase wear resistance

At what temperature does the change in steel structure begin when heating?

• 1000°C
• 500°C
• 723°C
• 250°C

Which type of steel contains more than 0.84% carbon and consists of pearlite and cementite?

• Hypoeutectoid steel
• Ferrite steel
• Hypereutectoid steel
• Martensite steel

What is the primary purpose of annealing steel through heat treatment?

• To make it magnetic
• To induce toughness
• To eliminate strain/hardness
• To increase wear resistance