GATE Fluid Mechanics and Mechanical Operations: Particle size, size reduction and classification – Previous Year Questions

4 GATE previous year questions on Particle size, size reduction and classification (Fluid Mechanics and Mechanical Operations, Chemical Engineering) with answers and explanations, from every paper.

1. GATE 2025 CH Q41 (2 marks, Multiple choice) – A catalyst particle is modeled as a symmetrical double cone solid as shown in the figure. For each conical sub-part, the radius of the base is r and…
2. GATE 2026 CH Q11 (1 mark, Multiple choice) – Which one of the following is NOT a type of chain conveyor?
3. GATE 2026 CH Q30 (1 mark, Numerical answer) – Consider two successive screen sizes in the Tyler standard screen scale, viz. 150 meshes per inch and 200 meshes per inch. Their linear sizes of the…
4. GATE 2026 CH Q45 (2 marks, Multiple choice) – The gross energy requirement, to reduce a very large feed of coal to such a size that 80% of the product passes through a 100 µm screen, is 13 kWh per…