EKC 394 LAB TEST: Reverse Osmosis and Distillation Column Performance
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Questions and Answers

What is the principle of reverse osmosis?

  • The direction of solvent flow can be reversed by applying pressure less than osmotic pressure
  • The solvent flow can be reversed by concentrating the mixture
  • The direction of the flow can be reversed by using a permeable membrane
  • The direction of solvent flow can be reversed by applying pressure greater than osmotic pressure (correct)
  • What is ultrafiltration most commonly used to remove from tertiary treated wastewater effluent?

  • Ions such as sodium, calcium, chloride
  • Colloidal and dissolved solids (correct)
  • Suspended and dissolved solids
  • Suspended and colloidal solids
  • Which statement about the performance of a distillation column is NOT true?

  • Distillation is a separation method in which components in a liquid mixture are separated based on their relative volatilities
  • The actual number of trays required is dependent on the tray efficiency
  • Fouling would not affect the tray efficiency (correct)
  • The vapor and liquid leaving the tray are essentially in equilibrium
  • What type of membrane is used in the filtration module?

    <p>Semi-permeable membrane</p> Signup and view all the answers

    When is the minimum number of theoretical plates required in a fractionating column?

    <p>Zero</p> Signup and view all the answers

    What should the relative volatility be to separate the components of a binary mixture?

    <p>Greater than unity</p> Signup and view all the answers

    When does an azeotrope occur?

    <p>VLE composition</p> Signup and view all the answers

    If a reflux in a distillation column is 100 mol/h and the overhead product rate is 50 mol/h, what is the reflux ratio?

    <p>150</p> Signup and view all the answers

    In membrane separations, which of the following is true?

    <p>Membrane separation requires a driving force</p> Signup and view all the answers

    In distillation, what does the overhead product typically contain?

    <p>Any number of components</p> Signup and view all the answers

    What is the effect of increasing insulation thickness up to the critical radius of insulation?

    <p>Added insulation will decrease heat loss</p> Signup and view all the answers

    What is the effect of raising the column pressure in distillation?

    <p>Lower relative volatility</p> Signup and view all the answers

    What type of flow arrangement is represented in the given diagram?

    <p>Parallel flow</p> Signup and view all the answers

    What mainly depends upon heat transfer by radiation?

    <p>Radiation</p> Signup and view all the answers

    In parallel flow heat exchangers, what can be predicted about the exit temperatures of hot and cold fluids?

    <p>The exit temperature of hot fluid is always less than the exit temperature of the cold fluid</p> Signup and view all the answers

    Which of the following statements is true about physical absorption?

    <p>A reversible phenomenon</p> Signup and view all the answers

    Which of the following is/are example/s of an operation of heat exchanger?

    <p>Feed water which is hot is brought into contact with cold water and the mixture leaves at uniform temperature.</p> Signup and view all the answers

    What does physical absorption mainly depend on?

    <p>the concentration gradient between the gas phase and liquid phase</p> Signup and view all the answers

    What is the objective of the experiment described in the text?

    <p>To investigate the heat transfer and surface heat transfer coefficient in a single tube and cross-flow heat exchanger</p> Signup and view all the answers

    What is the purpose of plotting the graph of ln Nu against ln Re?

    <p>To visualize the relationship between Nusselt number and Reynolds number for the tube</p> Signup and view all the answers

    What does the Nusselt number represent in the context of heat transfer?

    <p>The convective heat transfer coefficient</p> Signup and view all the answers

    What do the values of Reynolds number and Nusselt number indicate in Table 2.1?

    <p>The fluid velocity and convective heat transfer coefficient for the tube</p> Signup and view all the answers

    What does 'ho' represent in Table 2.1?

    <p>Convective heat transfer coefficient</p> Signup and view all the answers

    What does the slope of the graph of ln Nu against ln Re indicate?

    <p>The dependence of Nusselt number on Reynolds number</p> Signup and view all the answers

    What is the equation for the linear trendline representing the data for Row 4 in Experiment 2?

    <p>y = 0.9856x - 4.1343</p> Signup and view all the answers

    What are the values of C and n for Row 2 in Experiment 3?

    <p>C = 0.063979, n = 0.8451</p> Signup and view all the answers

    What is the value of Nusselt Number (Nu) for Row 1 in Experiment 2 at Iris Opening 5?

    <p>144.503</p> Signup and view all the answers

    What is the Reynolds Number (Re) for Row 4 in Experiment 2 at Iris Opening 6?

    <p>10157.65</p> Signup and view all the answers

    What is the Heat Transfer Coefficient (hcorr) for Row 1 in Experiment 2 at Iris Opening 3?

    <p>275.113 W/m2.⁰C</p> Signup and view all the answers

    What is the equation for the linear trendline representing the data for Row 1 in Experiment 2?

    <p>y = 0.9123x - 3.5301</p> Signup and view all the answers

    What is the Heat Transfer Coefficient (h) for Row 4 in Experiment 2 at Iris Opening 5?

    <p>306.293 W/m2.⁰C</p> Signup and view all the answers

    What is the value of Nusselt Number (Nu) for Row 2 in Experiment 3 at Iris Opening 4?

    <p>371.606</p> Signup and view all the answers

    What is the Reynolds Number (Re) for Row $1$ in Experiment $3$ at Iris Opening $6$?

    <p>$10658$. $02$</p> Signup and view all the answers

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