Self-Evaluation

Q1. Bioreactor is used for cultivation of –
       (A)   Microbial Cells
       (B)   Plant Cell
       (C)   Animal cells
       (D)   All of the above

Q2. Baffles in the bioreactor are used for –
       (A)   Mixing in the bioreactor
       (B)   Elimination of the vortex formation
       (C)   Facilitation of oxygen transfer
       (D)   All of the above

Q3. 1 vvm air in a 2 liter bioreactor translates to –
       (A)   2 liter air per minute
       (B)   0.5 liter air per minute
       (C)   4 liter air per minute
       (D)   None of the above

Q4. Sparger of the bioreactor –
       (A)   Supplies oxygen to the growing culture
       (B)   Provides agitation to the culture broth
       (C)   Both A & B
       (D)   None of the above

Q5. The proper identification of controller setting of a pH meter in Bio Engineering AG
       fermenter –
       (A)   Facilitate control of pH with-out oscillations
       (B)   Facilitate control of pH with-out offset between the set point and the controlled
                     variable
       (C)   Quick pH control action with-out oscillations & offset
       (D)   All of the above

Q6. Too narrow p-band value of the pH controller give rise to –
       (A)   Oscillations of pH around the set point
       (B)   Offset between the observed pH and the set point
       (C)   Too long control time
       (D)   None of the above

Q7. The DO probe works on –
       (A)   Amount of oxygen diffused through the membrane
       (B)   Rate of oxygen diffused through the membrane
       (C)   Partial pressure of oxygen
       (D)   None of the above

Q8. The zero setting of the DO Probe is done –
       (A)   By passing N2 in the bioreactor
       (B)   By passing Helium in the bioreactor
       (C)   By passing oxygen in the bioreactor
       (D)   By passing air in the bioreactor

Q9. The 100 % of the DO probe can be done –
       (A)   By passing oxygen in the bioreactor
       (B)   By passing air in the bioreactor
       (C)   Either A or B
       (D)   None of the above

Q10. Foam control in the bioreactor is necessary as it may lead to –
       (A)   Loss of medium
       (A)   Contamination of the broth
       (A)   Both A & B
       (A)   None of the above