Incomplete casting is the result of_____________?
Correct answer: C. Narrow sprue diameter
- A. More porous investment in the mould
- B. Hollow sprue pin
- C. Narrow sprue diameter
- D. Large reservoir
Explanation
A narrow sprue restricts the flow of molten alloy and may prevent the mould from filling completely, producing an incomplete casting. A large reservoir generally improves feeding during solidification rather than causing this defect.
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