TLS Online TPP Program
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TLS Online TPP Program
#Question id: 41081
#Unit 12. Biochemical Engineering
Q. In a stirred tank bioreactor, the specific interfacial surface area (a) is defined by the relationship a = 6ε/db. If an adjustment in the sparging system reduces the mean bubble diameter (db) by half while the gas holdup (ε) remains constant, how will this affect the specific interfacial surface area?A) It decreases by half.B) It remains unchanged.C) It doubles.D) It increases by a factor of four.how will this affect the specific interfacial surface area?
TLS Online TPP Program
#Question id: 41082
#Unit 12. Biochemical Engineering
Q. Consider the following statements regarding aeration and oxygen mass transfer in a bioreactor:P: The liquid-side mass transfer coefficient (kL) is exclusively a property of the fluid and remains unaffected by temperature or fluid dynamics.Q: The volumetric mass transfer coefficient (kLa) serves as the standard engineering metric for evaluating bioreactor aeration efficiency.R: The specific interfacial surface area (a) is directly proportional to the gas holdup (epsilon) and inversely proportional to the mean bubble diameter (db).S: Applying headspace overpressure alters Henry's Law constant, thereby reducing the saturated DO concentration at the interface (C*).
Which of the following combinations represents the correct statements?
TLS Online TPP Program
#Question id: 41083
#Unit 12. Biochemical Engineering
Q. According to standard agitation dynamics, which of the following statements accurately describes the primary function of a Rushton turbine compared to a marine or hydrofoil impeller?
TLS Online TPP Program
#Question id: 41084
#Unit 12. Biochemical Engineering
Q. Aeration and agitation function synergistically to maximize the volumetric mass transfer coefficient (kLa) while maintaining homogeneous mixing. Consider the following statements regarding their respective roles:
P: Sparging introduces gas into the liquid to supply O2 and strip out metabolic CO2, thereby providing the necessary gas holdup (ε).
Q: Agitation relies on low-shear hydrofoil impellers to decrease the bubble residence time, ensuring rapid gas turnover in high-density cultures.
R: The mechanical action of impellers serves to thin the liquid film resistance (kL), which facilitates better mass transfer across the gas-liquid interface.
S: The synergistic effect of aeration and agitation is primarily aimed at minimizing the specific interfacial area (a) to prevent foaming.
Which of the following combinations represents the correct statements?
TLS Online TPP Program
#Question id: 41085
#Unit 12. Biochemical Engineering
Q. Consider the following statements regarding the commercial fermentation processes used for vitamin production:
P. The industrial yield of Vitamin B2 (Riboflavin) in fungi such as Ashbya gossypii is significantly enhanced by utilizing lipid-rich media and bypassing purine-related feedback mechanisms.
Q. The production of Vitamin B12 can be achieved using Pseudomonas denitrificans under strict anaerobic conditions or Propionibacterium freudenreichii under aerobic conditions.
R. The modern microbial production of Ascorbic Acid utilizes Ketogulonicigenium vulgare and has largely replaced traditional multi-step synthetic chemical routes.
S. D-Sorbitol and L-Sorbose are crucial intermediates in the purine and pentose phosphate pathways associated with Riboflavin synthesis.
Which of the above statements are correct?
TLS Online TPP Program
#Question id: 41086
#Unit 12. Biochemical Engineering
Q. During the modern two-step fermentation process for synthesizing Vitamin C, which critical intermediate is directly subjected to acid catalysis to yield L-Ascorbic acid?