Define: (a) Dynamic head (b) Baffles (c) Capacity of Pump
[3 marks]How reflux ratio affects distillation column design.
[4 marks]Explain in detail about various steps for shell and tube Heat exchanger design.
[7 marks]Write down the advantage and disadvantage of PFR over MFR.
[3 marks]Explain the pressure drop in fittings and valves.
[4 marks]State the various types of shell and tube heat exchanger. Discuss the advantages and disadvantages of different types of shell and tube heat exchanger with each other.
[7 marks]Write a brief note on selection of heating media and cooling media in heat exchanger.
[7 marks]Discuss the process design of kettle type reboiler.
[3 marks]Discuss the effect of various parameters in design of equipment: 1. Baffle spacing in heat exchanger 2. Tray spacing in tray tower 3. Weir length in tray column
[4 marks]Benzene at 40 0C is pumped through the system at a rate of 10 m3 /h with the help of a centrifugal pump. The reservoir is at atmospheric pressure. Pressure at the end of discharge line is 350 kPa g. The discharge head is 3.05 m and the pump suction head is 1.1 m above the level of liquid reservoir. The friction loss in suction line 3.45 kPa and that in discharge line is 39 kPa. The mechanical efficiency of the pump is 0.65. The density of benzene is 870 kg/m3 and its vapour pressure at 40 0C is 29 kPa. Calculate (a) (NPSH) A and (b) power required by centrifugal pump.
[7 marks]Explain degree of completion of reaction.
[3 marks]List important industrial application of reactors.
[4 marks]Design a bubble column reactor with suitable rate equation.
[7 marks]Discuss in brief jet flooding and downcomer flooding
[3 marks]How to select key components for multicomponent distillation.
[4 marks]Explain McCabe-Thiele method for binary distillation.
[7 marks]Mention the selection criteria for heat exchanger.
[3 marks]Discuss Tinker’s flow model with neat figure.1
[4 marks]In vertical thermosyphon reboiler recirculation ratio is fixed by trial and error method. Discuss how to find or fix the recirculation ratio in the following conditions: (i) ΔPav ≈ ΔPt (ii) ΔPav > ΔPt (iii)ΔPav < ΔPt
[7 marks]Define (a) Weeping (b) Jet flooding (c) Down comer flooding
[3 marks]Mention the different types of weirs & down comers of tray tower.
[4 marks]1-2 shell and tube heat exchanger is used to cool methanol condensate from 95 °Cto 40°C. Flow rate of methanol is 100000 kg/h. Brackish water is used as coolant with temperature rise from 25 °Cto 40 °C. Choose 20mm OD, 16 mm id, 4.88 m long cupro-nickle tubes with triangular pitch Pt = 1.25 d . Based on overall heat transfer O coefficient 600 W/m2 C Calculate (1) Number of tubes (2) Shell Diameter K1 and n1 for tube bundle diameter: (For triangular pitch Pt= 1.25dO) No. of tube side passes K 0.319 0.249 0.175 0.074 0.0361 n 2.142 2.207 2.285 2.499 2.6751 Property Methanol Brackish Water Heat Capacity, kJ/kg °C 2.84 4.2 Density, kg/m3 750 995 Viscosity, mN.s/m 0.34 0.8 Thermal conductivity, 0.19 0.59 W/m °C
[7 marks]Explain in brief about liquid entrainment.
[3 marks]Discuss the advantages and disadvantages of Vacuum distillation.
[4 marks]Explain concept of NPSH in pumping system. Distinguish between (NPSH) and (NPSH) . If (NPSH) is less than (NPSH) , then A R A R suggest corrective action to make (NPSH) greater than (NPSH) . A R
