Self-Evaluation

Q1. The desirable feature of measurement by any instrument is-
       (A)   Quick response
       (B)   Reproducible response
       (C)   Stable response
       (D)   All of the above

Q2. The essential desirable feature of any controller is -
       (A)   Quick establishment of control action with-out any offset between the measured
                     value and set point
       (B)   Quick establishment of control action with-out any oscillations between
                     the measured value and set point
       (C)   Quick establishment of control action with-out any offset & oscillations between
                     the measured value and set point
       (D)   Quick establishment of control action with or with-out any offset & oscillations
                     between the measured value and set point

Q3. The decrease in pH in any fermentation is primarily due to-
       (A)   Consumption of carbon source
       (B)   Consumption of ammonia (Nitrogen) source
       (C)   Consumption of vitamins and growth factors
       (D)   Accumulation of metabolites

Q4. Adjustment of “p-band” to 0.5 and set point of pH as 5 will mean -
       (A)   The pH will be controlled in the range 4.5 to 5.5
       (B)   The pH will be controlled in the range 4.5 to 5.0
       (C)   The pH will be controlled in the range 4.0 to 5.5
       (D)   The pH will be controlled in the range 4.0 to 5.0

Q5. The pH control action in the bioreactor is dependent on -
       (A)   Density and volume of the fermentation broth
       (B)   Strength of acid /bases used for the control
       (C)   Addition of amount of acid /bases & pH range of addition in the bioreactor
       (D)   All of the above

Q6. The td value of pH controller panel of bio-engineering fermenter signifies -
       (A)   Safety time for the process after expiry of which if no control action takes place
                     then the controller will give an alarm.
       (B)   Dead time during which controller will not work at all
       (C)   Dead time during which no acid and alkali addition will take place
       (D)   None of the above is true

Q7. The pH meter has a temperature measurement device for -
       (A)   Good record keeping
       (B)   Temperature compensation of the pH readings
       (C)   Both 1& 2 are correct
       (D)   None of the above statements are true

Q8. Low value of p-band setting of the pH controller of Bioengineering fermenter gives
       (A)   Quicker but oscillatory response of control action
       (B)   Offset between controlled value of pH and the set point
       (C)   Unstability of the control action as the controller action will trigger with minor
                     change in pH values
       (D)   None of the above

Q9. High value of p-band setting of the pH controller of Bio-engineering fermenter
       features -
       (A)   Offset between controlled value of pH and the set point
       (B)   Oscillatory response of control action
       (C)   Larger time of control action
       (D)   Insensitivity of controller in a wider pH range and improper control action

Q10. The pH probe calibration is done by -
       (A)   At least two buffers to have a good linearity between the pH range of
                     measurement
       (B)   One buffer near the set point pH of the bioreactor
       (C)   Either of above (1 or 2)
       (D)   Neither of above (1 or 2)