The GATE Grind

GATE Manufacturing Processes I: Casting – Previous Year Questions

12 GATE previous year questions on Casting (Manufacturing Processes I, Production and Industrial Engineering) with answers and explanations, from every paper.

  1. GATE 2021 PI Q18 (1 mark, Multiple choice) – Match components P:aluminium-alloy IC-engine piston; Q:low-carbon steel oil pan; R:tungsten-carbide cutting insert; S:plastic bottle, with processes…
  2. GATE 2021 PI Q55 (2 marks, Numerical answer) – A sand-cast disk is 50 mm thick and 1.0 m in diameter. Chvorinov’s equation is t=B(V/A)2. Thickness and diameter are both halved to 25 mm and 0.5 m…
  3. GATE 2022 PI Q15 (1 mark, Multiple choice) – Match casting methods P: continuous; Q: investment; R: centrifugal, with products 1: thin intricate components; 2: hollow axisymmetric parts such as…
  4. GATE 2023 PI Q57 (2 marks, Numerical answer) – A cubical casting initially has side 100 mm. Volumetric solidification shrinkage and subsequent solid contraction are each 10%; shape is retained on…
  5. GATE 2023 PI Q63 (2 marks, Numerical answer) – A cylindrical casting has diameter 10 cm and mass 12.56 kg. Material density is 7.85 × 10⁻³ kg/cm³. Chvorinov exponent n = 2 and solidification time…
  6. GATE 2024 PI Q15 (1 mark, Multiple choice) – A cube of side a and cylinder of radius r and length 4r, of the same material and sand-casting process, have equal solidification times under…
  7. GATE 2024 PI Q54 (2 marks, Numerical answer) – A sand-mold sprue has height h₂ = 200 mm and flow 106 mm³/s. Liquid height above point 2 is h c = 25 mm. Areas at 2,3 are A₂,A₃; points 1,3 are…
  8. GATE 2025 PI Q23 (1 mark, Multiple choice) – Which casting defect can result when molten metal is supplied through two gates?
  9. GATE 2025 PI Q53 (2 marks, Numerical answer) – An 80 mm cube casting undergoes volumetric solidification shrinkage 4.5% and solid contraction 2%. Assume uniform cooling in every direction. Find the…
  10. GATE 2025 PI Q54 (2 marks, Numerical answer) – 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…
  11. GATE 2026 PI Q25 (1 mark, Multiple select) – Which ONE OR MORE tube cross-sections can be produced by true centrifugal casting? Sections are perpendicular to the rotation axis; drawings are not…
  12. GATE 2026 PI Q45 (2 marks, Multiple select) – A 10 cm steel cube is sand cast using a cylindrical side riser of diameter d and height h. Assume no shared cooling surface between casting and riser;…