Which type of forces stretch and distort the bubbles?
a) Shear forces
b) Strain forces
c) Surface tension
d) Frictional forces
Q.2.
Viscosity is inversely proportional to the size of eddies?
a) True
b) False
Q.3.
Larger foam is produced in bioreactors with increased headspace and small workspace?
a) True
b) False
Q.4.
“Instrument air compressor” should be used generally as a compressor?
a) True
b) False
Q.5.
What is the function of Pluronic f-68?
a) To increase the foaming
b) To decrease the foaming
c) Increase cell attachment
d) To change the composition of the cells
Q.6.
Microcarrier beadsμm in diameter are used to culture recombinant CHO cells for production of growth hormone. It is proposed to use a 6-cm turbine impeller to mix the culture in a 3.5-1itre stirred tank. Air and carbon dioxide are supplied by flow through the reactor headspace. The microcarrier suspension has a density of approximatelykg m-3 and a viscosity of 1.3 x 10-3 Pa s. Estimate the kinematic viscosity.
a) 1.30 × 10-6 m2s-1
b) 1.29 × 10-6 m2s-1
c) 1.50 × 10-6 m2s-1
d) 1.49 × 10-6 m2s-1
Q.7.
Refer to Qand calculate the power dissipated per unit mass of fluid.
a) 0.050 m2 s-3
b) 0.042 m2 s-3
c) 0.040 m2 s-3
d) 0.052 m2 s-3
Q.8.
Referring to Q6 and Q7 and, calculate the stirrer power.
a) 1.13×10-2 W
b) 1.10×10-2 W
c) 1.20×10-2 W
d) 1.23×10-2 W
Q.9.
Referring to Q7 and Qand calculate the stirrer speed.(Given: Np’ = 5)
a) 80.5 rpm
b) 85.0 rpm
c) 85.5 rpm
d) 80.0 rpm
Q.10.
What is the function of microcarrier beads?
a) To give the cells the shape of beads
b) It provides non-buoyancy condition
c) It helps in the lysis of cells
d) It provides protection and surface area
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