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Amanda Mmethi

Amanda M.

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INSTANT ANSWER

If water contains 34.3 mg/L Mg and 34.3 mg/L of Ca: What is the contribution of Mg to the water hardness expressed as a concentration of CaCO3?

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QUESTION 4 As a control engineer it is essential to have an excellent mathematical understanding of how the manipulated variables could influence the process variable in order for the control system to be fairly effective. Figure 1 below shows a fluid tank which is used to heat incoming stream \( F_{\text {in. }} \). The system is intended to control the temperature of the process fluid in a tank by either opening or closing the valve of a hot steam line. Figure 1. Fluid tank 4.1 Construct a feedforward control loop configuration for the process above. (6) 4.2 Construct a feedback control loop configuration. (6)

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INSTANT ANSWER

If a turbine, driven by water flowing from a reservoir 80 m higher than the turbine delivers 200 kW. What is the flowrate of the water in kg/s? Assume that the friction losses in the system yield an overall efficiency (actual work / ideal reversible work) of 75%. The reservoir is open to the atmosphere, and the exit velocity of the water is 5 m/s at a pressure of 150 kPa from the turbine.

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INSTANT ANSWER

Adsorption study is carried out in a mini pilot plant by contacting activated carbon with effluent water from a biological process until equilibrium is reached. Activated carbon is added to each of the six pots containing 0.5 litres of effluent water with an initial concentration of 2.54 mg/L. The obtained equilibrium data, expressed in total organic carbon (TOC), is presented in Table 2. Plot the Langmuir isotherm and determine the values of the constants.

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INSTANT ANSWER

Steam at a rate of 100 kg/hr is used to heat a stream of gas flowing on the tube side of a heat exchanger. The steam enters the shell side of the heat exchanger as saturated vapor at 10 bar of 90% quality and exists as saturated liquid water at 10 bar. Calculate the rate of heat transfer to the gas side.

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INSTANT ANSWER

OnehundredkgHClgasarecooledfrom300to1500Cat1atmpressure.Calculate ∆H and ∆U in kJ. The heat capacity equation found to be:Cp=7.24–1.76x10-3 T+3.07x10-6 T2 –10-9 T3,whereCpisinKg.Cal/(kg mol((kg) and T is in K

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INSTANT ANSWER

A cennifugal ptunp musl be placed above a large open water tank as in rhe figure below. and it m11s1 pump water at a flow rate of0.014 m1ts. At this flow rate. lbe required ner positive suction bead NPSHR is 4.5 m. as specified by the manufacnu-er. Assume tllal the major bead Joss between the tank Rnd 1be pump inlet is due to lhe filter ar the pipe inlet bavin11- a major loss coefficient Kt =20. Neglect other losses. T11e diameter or the pipe 011 the suclion side of the pump is 0.1 m. Calculnte rhe ma.x..inmm heiglit (zl) that 1be pump can be located above the wate1 surface witbour cavi1ation. The water remperanu·e is 30°C RUd the annospberic pressure is 101.3kPa.

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INSTANT ANSWER

An ethanol-water mixture is to be treated in a distillation column to produce a distillate product at a rate of 200 kmol/hr containing a mol fraction of 0.96 for ethanol. The bottoms product should not contain more than 0.14 mol fraction ethanol. Draw a schematic diagram representing the process and calculate the flow rates of the feed stream and bottoms product stream if 54 % of the ethanol in the feed stream is recovered to the distillate stream. A side stream is extracted at a rate of 30 % of that of the feed rate and has a mol fraction of 0.7 of ethano

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One gram – mole of substance A which is a vapor is contained in a vessel at 1000C and 10 atm.2.1. Use the ideal gas equation of state to estimate the system volume. (6) 2.2. Suppose the actual volume of the vessel is 2.8 liters. What percentage error results from assuming ideal has behaviour

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INSTANT ANSWER

Suppose 800 g of a crushed ore is placed in a graduated cylinder, filling it to the 200 cm3 level. One hundred cm3 of water is then added to the cylinder, whereupon the water level is observed to be at the 240.5 cm3 mark.1.1. Calculate the porosity of the dry particle bed. (6) 1.2. Calculate the bulk density of the ore in this bed. (2) 1.3. Calculate the absolute density of the ore.

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