Section A
Q1. What do you know about nominal diameter and schedule number of pipes? Explain. What is equivalent diameter of a pipe of non-circular cross-section? 200 ton/h of rock feed, of which 80% passed through a mesh size of 2.56 mm, were reduced in size such that 80% of the crushed product passed through a mesh size of 1.28 mm. The power consumption was 150 kW. If 200 ton/h of the same material is similarly crushed from a mesh size of 5.1 mm to a mesh size of 2.56 mm, then estimate the power consumption (in kW) using Bond's Law. A solid loading (dry basis) of 60 kg/m2 is dried with a constant drying rate of 6 kg/m2h. Consider the falling rate of drying is linear with moisture content. Calculate the drying time (in h) required to reduce an initial moisture content of 26% (wet basis) to a final moisture content of 2% (wet basis). The critical moisture and equilibrium moisture content on dry basis are 0.1 and 0.005 respectively. In absorption column, mechanical entrainment phenomena occurs. Under what conditions does mechanical entrainment phenomena occur in tray absorption column? How does it affect the tray efficiency? The form is the same for the Nusselt number and the Biot number. How are they different from one another in terms of the variables used and their physical significance?
(a) (i)
(b) (ii)
(c) (b)
(d) (c)
(e) (d)
(f) (e)
