GTU 3150502 Mechanical Operations Summer 2024 Question Paper & PDF

Define (a) Mesh number (b) Screen Effectiveness (c) Statistical diameter of particle.

Differentiate between differential analysis and cumulative analysis.

A quartz mixture having a certain screen analysis through a standard 10 mesh screen. Calculate (a) the mass ratio of overflow and underflow to feed and (b) the effectiveness of the screen. Data: $D_P = D_{PC} = 1.651$ mm, $x_U = x_B = 0.195$ (mass fraction of A in underflow) (cumulative mass fraction), $x_F = 0.47$ (mass fraction of A in feed), $x_O = x_D = 0.85$ (mass fraction of A in overflow)

The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. Determine the estimated amount of energy to grind the particles from a very large size to 50 μm.

Classify the size reduction equipment’s according to their usage and give examples in each category.

A tube of 0.05 m² cross sectional area is packed with spherical particles up to a height of 0.25 m. The porosity of the bed is 0.35. It is desired to fluidize the particles with water. Determine the minimum fluidization velocity using Ergun’s equation. Data: Density = 1000 kg/m³ and viscosity = 10⁻³ Pa·s. Diameter of particle = 0.01 m and particle density = 2600 kg/m³