Fluid Flow(Engineering > Biochemical Engineering ) Questions and Answers
Question 1. Pluronic F68 protects mammalian cells from damage stems as it is a/an
surface active agent which stabilizes foams
surface active agent which destabilizes foams
excellent source of vitamins
coagulant
Explanation:-
Answer: Option A. -> surface active agent which stabilizes foams Answer: (a).surface active agent which stabilizes foams
Question 2. Which of the following describes the importance of the Kolmogorov eddy size in the biotechnology?
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
All of the above
Explanation:-
Answer: Option D. -> All of the above Answer: (d).All of the above
Question 3. Reynolds number for turbulent flow over a plate should be more than
5 x 10⁵
10⁶
5 x 10⁵
500
Explanation:-
Answer: Option B. -> 10⁶ Answer: (b).10⁶
Question 4. If the viscosity of a fluid decreases with the length of time that it is being mixed, then this fluid is
newtonian
rheopectic
viscoelastic
thixotropic
Explanation:-
Answer: Option D. -> thixotropic Answer: (d).thixotropic
Question 5. A stirred tank reactor containing a fluid with a density of 2.5 g.ml¹ and viscosity of 0.002 kg m¹s¹ 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
2500
100
12,50,000
1,000,000
Explanation:-
Answer: Option C. -> 12,50,000 Answer: (c).12,50,000
Question 6. The viscosity of water at STP is approximately
0.005 kg.m¹.s¹
0.001 kg.m¹.s¹
0.003 kg.m².s¹
0.1 g.cm¹.s¹
Explanation:-
Answer: Option B. -> 0.001 kg.m¹.s¹ Answer: (b).0.001 kg.m¹.s¹
Question 7. Filamentous fungal cells are more shear sensitive than bacterial cells because of
the presence of citin in cell walls of filamentous fungi
larger in size than bacterial cells and therefore are more susceptible to shear forces
fungal cells are much larger than bacterial cells
all of the above
Explanation:-
Answer: Option D. -> all of the above Answer: (d).all of the above
Question 8. Bubble free aeration systems requires
silicone tubing or gas permeable membranes to facilitate gas transfer
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
Explanation:-
Answer: Option A. -> silicone tubing or gas permeable membranes to facilitate gas transfer Answer: (a).silicone tubing or gas permeable membranes to facilitate gas transfer
Question 9. Non-linear relationship between shear stress and shear rate exists in
newtonian fluids
non-newtonian fluids
both (a) and (b)
none of these
Explanation:-
Answer: Option B. -> non-newtonian fluids Answer: (b).non-newtonian fluids
Question 10. If the viscosity of a fluid decreases with increasing stirrer speed, then the nature of the fluid is
newtonian
pseudoplastic
dilatant
thixotropic
Explanation:-
Answer: Option B. -> pseudoplastic Answer: (b).pseudoplastic