mcq2-20

What is the purpose of surface hardening in steel components?

• To soften the steel
• To increase ductility
• To induce shock resistance
• To make it brittle at the core

Which of the following is NOT a type of surface hardening method?

• Carburizing
• Nitriding
• Quenching
• Tempering

In case hardening, what is the typical carbon content of the surface layer?

• 0.009
• 0.0015
• 0.004
• 0.017

What is the purpose of reheating the carburized steel in case hardening?

• To soften the case
• To induce shock resistance
• To refine the core structure
• To harden the core structure

In the case hardening process, which part of the steel remains soft and tough?

• Surface layer
• Core
• Both surface layer and core
• None of the above