(21)
At room temperature, hardness of precipitation hardening alloys ______
Answer: increases with time
Answer: increases with time
Answer: homogeneous solid solution
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Answer: 70 % Cu and 30 % Zn
Answer: naval brass
Answer: Brazing brass
Answer: High carbon content
Answer: spheroidal cast iron
1. Blowholes are present in the castings
2. Increases fluidity
3. Influences the solidification of liquid alloys
4. Reacts with iron to form iron sulphide
Answer: 2 and 3
Answer: gray cast iron
Answer: high thermal conductivity
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