GATE ME 2015 Set 3 — Question 17

MCQ+1 / -0.33EasyCasting TypesCastingManufacturing ProcessesPattern Design & Allowances

Manufacturing Processes → Casting → Casting Types

Last updated 5 September 2026

Question

In full mould (cavity-less) casting process, the pattern is made of

Correct answer (A) expanded polystyrene Solution Full mould casting, also known as lost foam casting or cavity-less casting, uses a pattern made of expanded polystyrene (EPS). The pattern is placed in a flask and surrounded by unbonded sand. When molten metal is poured, the heat causes the polystyrene pattern to vaporize and escape through the sand, leaving the metal to fill the resulting cavity. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (A) expanded polystyrene Solution Full mould casting, also known as lost foam casting or cavity-less casting, uses a pattern made of expanded polystyrene (EPS). The pattern is placed in a flask and surrounded by unbonded sand. When molten metal is poured, the heat causes the polystyrene pattern to vaporize and escape through the sand, leaving the metal to fill the resulting cavity.

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