MCQOPTIONS
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MCQOPTIONS
This section includes 108 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The average concentration of oxygen in the boundary layers surrounding the bubbles (Co*) in a reactor is normally determined by |
| A. | laser based photographic systems |
| B. | ultra-small dissolved oxygen probes |
| C. | measuring the steady state concentration of oxygen in the bulk liquid after inoculation of the reactor |
| D. | measuring the steady state concentration of oxygen in the bulk liquid prior to inoculation of the reactor |
| Answer» E. | |
| 102. |
A reactor has a total volume of 50,000 litres. If it has a headspace volume of 10,000 litres, then volume of liquid in the reactor will be |
| A. | 20,000 l |
| B. | 10,000 l |
| C. | 40,000 l |
| D. | 30,000 l |
| Answer» D. 30,000 l | |
| 103. |
Turbine impeller consists of flat impeller blades with |
| A. | a angled pitch welded directly to the shaft |
| B. | a vertical pitch welded directly to the shaft |
| C. | a angled pitch welded to a horizontal disk |
| D. | a vertical pitch welded to a horizontal disk |
| Answer» E. | |
| 104. |
Which of the following impellers will provide radial flow? |
| A. | Flat blade turbines |
| B. | Paddles |
| C. | All of the above |
| D. | Disk flat blade turbines |
| Answer» D. Disk flat blade turbines | |
| 105. |
A cylindrical reactor fitted with Rushton Turbine has a liquid volume of 100,000 litres. It has an aspect ratio (the ratio of the channel height to the width) of 2:1. The diameter of the impeller should be approximately: |
| A. | 3.3 m |
| B. | 1.3 m |
| C. | 7.3 m |
| D. | 5.3 m |
| Answer» C. 7.3 m | |
| 106. |
Which of the following(s) is/are non-mechanically agitated reactors? |
| A. | Bubble column |
| B. | Stirrer tank reactor |
| C. | Both ( and ( |
| D. | Air lift reactor |
| Answer» D. Air lift reactor | |
| 107. |
Radial flow impellers |
| A. | direct flow towards the walls of the reactor |
| B. | provide high shear conditions for breaking up bubbles |
| C. | provide low shear conditions and are suited for use in shear sensitive procesess |
| D. | Both ( and ( |
| Answer» E. | |
| 108. |
If the stirrer speed is too slow, bubbles will accumulate and coalescese under the impeller. This phenomenon is known as a |
| A. | flooded impeller |
| B. | coalesced impeller |
| C. | dry impeller |
| D. | river impeller |
| Answer» B. coalesced impeller | |