Size Reduction and Material Handling - Agricultural Process Engineering - Agricultural Engineering Previous Year Questions

Particles having average diameter of 20 μm and particle density of 1000 kg m^-3 enter a cyclone of 500 mm diameter at a linear velocity of 20 m s^-1. The separation factor of the cyclone is

Air carrying dust particles enters a cyclone separator of 800 mm diameter at a tangential velocity of 30 m.s⁻¹ near the wall. The average diameter of the dust particles is 100 μm. The separation factor is nearest to (Take g = 9.81 m.s⁻²)

In grinding of black pepper, 80% feed passes through 6 mm screen, and 80% product passes through 0.5 mm screen. The gross energy required is 10 kW.h per ton of material. Assuming Bond’s law holds good, and for the same feed conditions, if 80% product passes through 0.2 mm screen, the energy required, in kW.h per ton of material, is nearest to