1. Molybdenum: Forms abrasion resisting particles. |
2. Phosphorus: Improves machinability in free cutting steels. |
3. Cobalt: Contributes to red hardness by hardening ferrite. |
4. Silicon: Reduces oxidation resistance. |
A) 2, 3 and 4
B) 1, 3 and 4
C) 1, 2 and 4
D) 1, 2 and 3
Correct Answer: A
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