Match the mold elements in the casting process with the most suitable function
| Mold element | Function | ||
| P | Blind riser | I | Casting with internal cavity |
| Q | Chill | II | Molten metal reservoir |
| R | Skim bob | III | Nucleating agent |
| S | Core | IV | Assisting in faster heat removal from melt |
| T | Insulating sleeve | V | Removal of impurities |
| U | Inoculant | VI | Increasing the solidification time |
GATE ME - 2025,
Answer: A
The correct matching is P-II, Q-IV, R-V, S-I, T-VI, U-III.
A blind riser is a reservoir of molten metal that feeds shrinkage (II). A chill is a metal insert that removes heat faster to promote directional solidification (IV). A skim bob traps slag and dross in the gating (V). A core forms internal cavities (I). An insulating sleeve round a riser keeps it molten longer, increasing its solidification time (VI). An inoculant is added to the melt as a nucleating agent (III).
Each other option misplaces at least two elements: for example, giving the chill the job of removing impurities, or the core the job of removing impurities.
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