Correct Answer: increasing the partial pressure of oxygen at the base of the reactor
5. A cylindrical reactor has a liquid volume of 100,000 litres. It has an aspect ratio the ratio of the channel height to width of 1:1. The height of the liquid in the reactor will be approximately:
Correct Answer: concentration is less than the critical concentration
7. Which of the following model holds correct for the two-film theory? (where KL is the mass transfer coefficient, DAB diffusivity and Zf film thickness)
10. The maximum solubility of the alkane in the medium is 5 ppm. If the actual dissolved concentration of the alkane in the medium is 1 ppm. what conclusion may be drawn?
Options
A. The growth rate is limited by the rate of mass transfer of the alkane into the fermentation medium
B. The growth rate is limited by the intrinsic kinetic properties of the cells and not by mass transfer
C. The growth rate is neither mass transfer nor kinetically limited
D. No conclusion on the growth rate can be withdrawn