1. Explain why Low carbon steel in tile normalised condition is stronger than tile same steel ill tile annealed condition.
2. Case carburizing heat treatment is not usually carried out for medium carbon steels. Explain why?
3. What do you mean by "critical cooling rate" in hardening of steels?
4. What do you mean by "heat treatment"? Write down its purpose.
5. Write down the factors affecting the CCR?
6. What do you mean by normalizing? Explain its purpose.
7. What do you mean by quenching? Write down some of the quenching medium.
8. Write downthe factors affecting the hardness?
9. What do you mean by hardnability? Write down the factors affecting it?
10. What do you mean by induction hardening?