Agricultural Process Engineering - Agricultural Engineering Previous Year Questions

It is given that the water activity of a food is equal to the relative humidity of the atmosphere that is in equilibrium with the food. The partial pressure of water vapour of the food at a specific temperature 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)

A circular mild steel storage bin of 8 m height contains wheat having bulk density of 800 kg.m⁻³. The coefficient of static friction between wheat grain and bin wall is 0.40 and hydraulic radius of the bin is 1 m. Equivalent diameter of the bin, in m, is

A single effect evaporator is used to concentrate orange fruit juice with 2.7:1 concentration ratio of product solid to feed solid. The juice is fed to the evaporator at 100 kg.h^-1 and 30 °C, where the product moisture evaporates at 60 °C. The specific heat of juice is 3.9 kJ.kg^-1.°C^-1. The latent heat of vaporisation at 60 °C is 2450 kJ.kg^-1. Heat to accomplish the evaporation, in MJ.h^-1, is nearest to

Mechanical model/method NOT related to rheological behaviour of food products is known as

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