The GATE Grind

GATE 2023 MT – Question 52

Manufacturing Processes · Metal casting · 2 marks · Multiple select

Compared to top gating, the effect(s) of bottom gating in sand mold casting is/are

  1. reduced melt oxidation
  2. reduced mold erosion
  3. enhanced melt oxidation
  4. enhanced mold erosion

Practise this question in The GATE Grind →

Show answer and explanation

Correct answer: (A) reduced melt oxidation; (B) reduced mold erosion

Explanation

Bottom gating fills the mould progressively from below, reducing free-fall splashing and turbulence. This reduces exposure/entrainment that oxidizes melt and lowers direct jet impingement that erodes sand.

Therefore **reduced oxidation and reduced erosion, A,B**.