The GATE Grind

GATE 2025 ME – Question 38

Casting, Forming and Joining Processes · Casting: patterns, moulds, cores, solidification, riser and gating design, defects · 2 marks · Multiple choice

Match the mold elements in the casting process with the most suitable function

Mold elementFunction
PBlind riserICasting with internal cavity
QChillIIMolten metal reservoir
RSkim bobIIINucleating agent
SCoreIVAssisting in faster heat removal from melt
TInsulating sleeveVRemoval of impurities
UInoculantVIIncreasing the solidification time
  1. P-II, Q-IV, R-V, S-I, T-VI, U-III
  2. P-II, Q-V, R-VI, S-I, T-III, U-IV
  3. P-V, Q-I, R-VI, S-III, T-II, U-IV
  4. P-II, Q-IV, R-I, S-V, T-VI, U-III

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Show answer and explanation

Correct answer: (A) P-II, Q-IV, R-V, S-I, T-VI, U-III

Explanation

A riser is a reservoir of molten metal (II). A chill removes heat faster from the melt (IV). A skim bob traps and removes impurities (V). A core makes an internal cavity (I). An insulating sleeve keeps the riser hot, which increases the solidification time (VI). An inoculant acts as a nucleating agent (III).