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- Question
In an airlift bioreactor, the air sparging region is called
Options- A. downcomer
- B. disengagement zone
- C. air riser
- D. none of these
- Correct Answer
- air riser
- 1. What is the ratio of depth of liquid in vessel to the diameter of tank (H:Dt)?
Options- A. 1 : 1
- B. 2 : 1
- C. 4 : 1
- D. none of these Discuss
- 2. Main reason for using baffles in stirred tank reactors are
Options- A. baffles permit turbulence conditions to arise at low stirrer speed
- B. baffles will allow axial mixing to occur even with radial flow impellers
- C. both (a) and (b)
- D. baffles prevent turbulent conditions in stirred tank reactors Discuss
- 3. Mixing per unit volume is observed to be poorest in
Options- A. continuous packed bed reactor
- B. continuous fluidized bed bioreactor
- C. continuous airlift bioreactor
- D. none of the above Discuss
- 4. In a Lineweaver-Burk Plot, competitive inhibitor shows which of the following effect?
Options- A. It moves the entire curve to right
- B. It moves the entire curve to left
- C. It changes the x-intercept
- D. It has no effect on the slope Discuss
- 5. A stirred tank reactor containing a fluid with a density of 2.5 g.ml-1 and viscosity of 0.002 kg m-1s-1 is mixed at 120 rpm. If the fluid is mixed with an impeller having diameter 50 cm, then the Reynolds number of the liquid in the reactor is
Options- A. 2500
- B. 100
- C. 12,50,000
- D. 1,000,000 Discuss
- 6. Which of the following is used to calculate mass of substrate in the reactor?
Options- A. Flow rate x substrate concentration in the reactor
- B. Volume of reactor x substrate concentration in reactor
- C. Flow rate x mass of reactor
- D. Volume of reactor x Flow rate Discuss
- 7. A flooded impeller will lead to poor oxygen transfer rates because
Options- A. bubbles tend to coalesce under the impeller
- B. bubbles tend to break down too rapidly under high shear conditions
- C. bubbles tend to move too quickly through the bulk liquid
- D. the cells clog up the surface of the bubble Discuss
- 8. Classical noncompetitive inhibition is obtained only under
Options- A. slow equilibrium conditions
- B. moderate equilibrium conditions
- C. rapid equilibrium conditions
- D. non-equilibrium conditions Discuss
- 9. The enzyme ?-galactosidase is also known as
Options- A. lactase
- B. EC3.2.1.23
- C. both (a) and (b)
- D. isomerase Discuss
- 10. The solvent flux across the membrane can be expressed as (where A is the area, Lp is the membrane permeability, ? is the reflection point, ?p is applied pressure and ?? is the osmotic pressure)
Options- A. J = Lp(?p - ???)
- B. J/A = Lp(?p - ???)
- C. J = Lp/???
- D. J/A = Lp/?p Discuss
More questions
Correct Answer: 1 : 1
Correct Answer: both (a) and (b)
Correct Answer: continuous packed bed reactor
Correct Answer: It changes the x-intercept
Correct Answer: 12,50,000
Correct Answer: Volume of reactor x substrate concentration in reactor
Correct Answer: bubbles tend to coalesce under the impeller
Correct Answer: rapid equilibrium conditions
Correct Answer: both (a) and (b)
Correct Answer: J = Lp(?p - ???)
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