GATE 2025 PI – Question 54
Casting solidification starts at 10:00 am. Centerline metal starts solidifying at 10:03 and finishes at 10:10. Casting is completely solid when the centerline finishes. Find centerline feeding resistance CFR (% integer).
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Correct answer: 70 to 70
Explanation
Centerline freezing duration is 10 − 3 = 7 minutes, while total casting solidification time is 10 minutes. Therefore $\mathrm{CFR}=100(7/10)=\mathbf{70\%}$.