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Home Biochemical Engineering Fluid Flow See What Others Are Saying!
  • Question
  • The viscosity of liquid was classified as both dilatant and rheopectic, which means that the viscosity


  • Options
  • A. increased with stirring speed but decreased with mixing time
  • B. increased with stirring speed and increased with mixing time
  • C. decreased with stirring speed but increased with mixing time
  • D. decreased with stirring speed and decreased with mixing time

  • Correct Answer
  • increased with stirring speed and increased with mixing time 


  • More questions

    • 1. Reynolds number for laminar flow over a plate should be less than

    • Options
    • A. 500 mm
    • B. 5 x 10-5
    • C. 5 x 105
    • D. 5 m
    • Discuss
    • 2. Acid used mostly for removal of milk stone is

    • Options
    • A. phosphoric acid
    • B. nitric acid
    • C. gluconic acid
    • D. tartaric acid
    • Discuss
    • 3. Which of the following describes the importance of the Kolmogorov eddy size in the biotechnology?

    • Options
    • A. The Kolmogorov eddy size is a measure of the smallest eddy size in a liquid
    • B. When the Kolmogorov eddy size become equivalent or smaller than the cell or particle diameter, then the cell or particle will become susceptible to shear damage
    • C. At the Kolmogorov eddy size, much of the energy of the originating eddy will be released
    • D. All of the above
    • Discuss
    • 4. In the death phase

    • Options
    • A. nutrients available for the cells are depleted and begin to die
    • B. the number of viable cells will increase
    • C. nutrients available for cells are replenished and start to multiply
    • D. none of the above
    • Discuss
    • 5. Which of the following is correct?

    • Options
    • A. The viscosity of liquids and gases decrease with increasing temperature
    • B. The viscosity of liquids and gases increase with increasing temperature
    • C. the viscosity of gases increases with increasing temperature, but decreases in liquids
    • D. the viscosity of gases decreases with increasing temperature, but decreases in liquids.
    • Discuss
    • 6. Soya off flavour removal may be achieved using

    • Options
    • A. di acetyl reductase
    • B. ?- amylase
    • C. aldehyde oxidase
    • D. protease
    • Discuss
    • 7. Temporary hardness of water may be removed by adding

    • Options
    • A. calcium hydroxide
    • B. calcium carbonate
    • C. calcium chloride
    • D. sodium bicarbonate
    • Discuss
    • 8. Liquefaction of starch to dextrin is carried out by

    • Options
    • A. ?-amylase
    • B. cellulase
    • C. pectinase
    • D. all of these
    • Discuss
    • 9. Which of the following is considered as a pretreatment to the biological feeds?

    • Options
    • A. Heating to denature the proteins
    • B. Addition of filter aids to increase the porosity
    • C. Addition of electrolytes
    • D. All of the above
    • Discuss
    • 10. Filtration leaf test results indicate that the filtration rate of a protein product is 100 dry lbs/(ft2 hr). What size production filter would be required to obtain 100 dry lbs of filter cake/hr?

    • Options
    • A. 1.54 ft2
    • B. 3.08 ft2
    • C. 65 ft2
    • D. 65 lbs/ ft2.hr
    • Discuss


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