The GATE Grind

GATE 2025 MT – Question 22

Manufacturing Processes · Metal casting · 1 mark · Multiple choice

In metal casting, which one of the following gating ratios (sprue-runner-gate area ratio) represents a non-pressurized gating system?

  1. 1 : 2 : 3
  2. 3 : 2 : 1
  3. 4 : 3 : 1
  4. 5 : 4 : 1

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Show answer and explanation

Correct answer: (A) 1 : 2 : 3

Explanation

A non-pressurized system expands total flow area downstream to reduce velocity and avoid filling the entire runner/gate system under pressure. The sprue:runner:gate ratio **1:2:3, A** does this. The other ratios contract downstream and represent pressurized arrangements.