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Home⇒ Medical Science⇒ Bochemical Engineering⇒ Fluid flow
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ Non-linear relationship between shear stress and shear rate exists in non-newtonian fluids [other wrong options] [Discuss in forum] newtonian fluids both (a) and (b) none of these |
Q22 ⇒ A pseudoplastic fluid is one in which the viscosity decreases with increasing stirrer speed [other wrong options] [Discuss in forum] is constant regardless of the stirrer speed or mixing time changes during mixing but returns to its original state after mixing increases with increasing stirrer speed |
Q23 ⇒ The best described action of Pluronic F68 (non-ionic detergent) in a cell culture medium is that, it acts on the surface properties of the cells and the culture medium [other wrong options] [Discuss in forum] provides nutrients for the cells acts as a flocculant acts as a coagulant |
Q24 ⇒ The viscous nature of a non-Newtonian fluid changes with the level of power input and/or the length of time during which the fluid is mixed [other wrong options] [Discuss in forum] remains constant with time and power input is similar to that of a perfect gas is similar to that of water |
Q25 ⇒ A Brookfield viscometer measures viscosity by determining the torque required to move an impeller at a set speed [other wrong options] [Discuss in forum] the shear stress the shear rate the shear stress and shear rate |
Q26 ⇒ A fluid in which the viscosity increases with increasing stirrer speed and mixing time can be called as dilatant, rheopectic fluid [other wrong options] [Discuss in forum] newtonian fluid pseudoplastic, thixotropic fluid dilatant pseudoplastic fluid |
Q27 ⇒ Which of the following can act as a shear protectorant? Serum [other wrong options] [Discuss in forum] Silicone oil Glucose Glutamic acid |
Q28 ⇒ A dilatant fluid is one in which the viscosity increases with increasing stirrer speed [other wrong options] [Discuss in forum] is constant regardless of the stirrer speed or mixing time changes during mixing but returns to its original state after mixing decreases with increasing stirrer speed |
Q29 ⇒ Which of the following describes the importance of the Kolmogorov eddy size in the biotechnology? All of the above [other wrong options] [Discuss in forum] The Kolmogorov eddy size is a measure of the smallest eddy size in a liquid 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 At the Kolmogorov eddy size, much of the energy of the originating eddy will be released |
Q30 ⇒ The viscosity of the culture fluid is classified as both pseudoplastic and thixotropic which indicates that the viscosity decreases with stirring speed and decreases with mixing time [other wrong options] [Discuss in forum] increases with stirring speed but decreases with mixing time increases with stirring speed and increases with mixing time decreases with stirring speed but increases with mixing time |
Q31 ⇒ A stirred tank reactor containing a fluid with a density of 2.5 g.ml-1 and viscosity of 0.002 kg m-1s-1 is mixed at 120 rpm. If the fluid is mixed with an impeller having diameter 50 cm, then the Reynolds number of the liquid in the reactor is 12,50,000 [other wrong options] [Discuss in forum] 2500 100 1000000 |
Q32 ⇒ A Brookfield viscometer cannot determine the shear stress because the shear stress is not defined [other wrong options] [Discuss in forum] a computer is required the impeller type is given only by numbers all of the above |
Q33 ⇒ Bubble free aeration systems requires silicone tubing or gas permeable membranes to facilitate gas transfer [other wrong options] [Discuss in forum] carbon dioxide instead of air to supply oxygen silicone tubing or gas permeable membranes to remove carbon dioxide by oxygen in the form of hydrogen peroxide filled headspace of the reactor with carbon dioxide |
Q34 ⇒ The SI unit for viscosity is kg.m-1.s-1 [other wrong options] [Discuss in forum] kg.m-2.s-2 kg.m-3.s-1 kg.m-1.s-2 |
Q35 ⇒ The viscosity of a fluid increases with the length of time that it is being mixed. This fluid would be best described as being rheopectic [other wrong options] [Discuss in forum] newtonian viscoelastic thixotropic |
Q36 ⇒ Animal cell cultures do not have much effect on shear forces because the cell size is generally smaller than the critical eddy size at which shear will have an effect [other wrong options] [Discuss in forum] cells are larger than the critical eddy size at which shear will have an effect animal cells have cell walls animal cells have cell membranes |
Q37 ⇒ The approach which is commonly used to determine the level of damage to animal cells in a culture medium is to monitor the level of lactate dehydrogenase activity [other wrong options] [Discuss in forum] the concentration of lactate in the medium the level of lactate oxidase activity in the medium the level of lactase activity in the medium |
Q38 ⇒ The viscosity of liquid was classified as both dilatant and rheopectic, which means that the viscosity increased with stirring speed and increased with mixing time [other wrong options] [Discuss in forum] increased with stirring speed but decreased with mixing time decreased with stirring speed but increased with mixing time decreased with stirring speed and decreased with mixing time |
Q39 ⇒ A viscoelastic fluid is one in which the viscosity changes during mixing but returns to its original state after mixing [other wrong options] [Discuss in forum] is constant regardless of the stirrer speed or mixing time increases with increasing stirrer speed decreases with increasing stirrer speed |
Q40 ⇒ Which of the following factors will affect the sensitivity of animal cells to shear conditions? All of the above [other wrong options] [Discuss in forum] Cell size Availability of nutrients in the medium The presence of shear protectorants in the medium |
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