Question 4. Vortexing in stirred tank reactors can be prevented by
installing baffles in the reactor
shifting the impeller to an off-centre position
Both (a) and (b)
using axial flow impellers
Explanation:-
Answer: Option C. -> Both (a) and (b) Answer: (c).Both (a) and (b)
Question 5. Henry's law relates
the partial pressure of oxygen and the saturation concentration of oxygen in the liquid
the oxygen transfer rate and the bubble size
the oxygen transfer rate and the temperature
the oxygen transfer rate to the partial pressure of oxygen in the liquid
Explanation:-
Answer: Option A. -> the partial pressure of oxygen and the saturation concentration of oxygen in the liquid Answer: (a).the partial pressure of oxygen and the saturation concentration of oxygen in the liquid
Question 6. Pure oxygen, if used instead of air will increase oxygen transfer rates because
the saturation concentration of oxygen is higher
the bubble size is smaller
the oxygen transfer coefficient is larger
the partial pressure of oxygen in the gas phase is lower
Explanation:-
Answer: Option A. -> the saturation concentration of oxygen is higher Answer: (a).the saturation concentration of oxygen is higher
Question 7. For aerated mixing vessels in an aqueous solution, the mass transfer coefficient (kL) co-relating power consumption (Pm) and fermenter volume (V) can be expressed as