MCQOPTIONS
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MCQOPTIONS
This section includes 122 Mcqs, each offering curated multiple-choice questions to sharpen your Bioprocess Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following do not comes under continuous filtration? |
| A. | Vacuum rotary drum filter |
| B. | Rubber belt filter |
| C. | Belt filter cake discharge |
| D. | Disc filter |
| Answer» E. | |
| 2. |
What do you mean by the term ”Backwashing”? |
| A. | Excluding intermittent use of compressed air during process |
| B. | Is a form of destructive maintenance |
| C. | Washing at the backside of the filter |
| D. | Including intermittent use of compressed air during the process. |
| Answer» E. | |
| 3. |
What type of filter does not come under the Membrane filters? |
| A. | Ultra filtration |
| B. | Microfiltration |
| C. | Precoat (filter aid) filtration |
| D. | filtrationd) Nanofiltration |
| Answer» D. filtrationd) Nanofiltration | |
| 4. |
Microfiltration can be used to remove viruses. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
A city is to install rapid sand filters downstream of the clarifiers. The design loading rate is selected to be 160 m3/ (m2.d). The design capacity of the water works is 0.35 m3/s. The maximum surface per filter is limited to 50 m2 and find out the normal filtration rate? |
| A. | 154.3 m3/(m2.d) |
| B. | 154.6 m3/(m2.d) |
| C. | 155.6 m3/(m2.d)d) 155.3 m3/(m2. |
| D. | . The design capacity of the water works is 0.35 m3/s. The maximum surface per filter is limited to 50 m2 and find out the normal filtration rate?a) 154.3 m3/(m2.d)b) 154.6 m3/(m2.d)c) 155.6 m3/(m2.d)d) 155.3 m3/(m2.d) |
| Answer» B. 154.6 m3/(m2.d) | |
| 6. |
A rotary drum filter with 30% submergence is used to filter concentrated aqueous slurry of calcium carbonate containing 15lb of solids per cubic foot of water. The pressure–drop is 2011Hg. If the filter cake contains 50% mixture (wet basis), calculate the filter area required to filter 10 gal/min of slurry. The filter cycle time is 5 min. The specific cake resistance depends on the pressure–drop as:α (ft/lb) = α (Δp)0.26, where α = 2.90×1010Viscosity of the filtrate = 6.72×10-4 lb/ft-s. Density of calcium carbonate = 168.8 lb/ft3. Neglect filter medium resistance. |
| A. | ≅ 88 ft2 |
| B. | = α (Δp)0.26, where α = 2.90×1010Viscosity of the filtrate = 6.72×10-4 lb/ft-s. Density of calcium carbonate = 168.8 lb/ft3. Neglect filter medium resistance.a) ≅ 88 ft2b) ≅ 86 ft2 |
| C. | ≅ 82 ft2 |
| D. | ≅ 90 ft2 |
| Answer» D. ≅ 90 ft2 | |
| 7. |
“Filter aid can also be added to the fermentation broth to increase the porosity of the cake as it forms”, what does this statement means? |
| A. | To increase the pH of the fermentation broth |
| B. | To decrease the filtration rate |
| C. | To decrease the pI of the fermentation broth |
| D. | To increase the filtration rate |
| Answer» E. | |
| 8. |
Which of the following process is used to separate insoluble particles from liquids? |
| A. | Filtration |
| B. | Extraction |
| C. | Drying |
| D. | Sieving |
| Answer» B. Extraction | |
| 9. |
What do you mean by filter cake? |
| A. | The cake which is to be filtered |
| B. | A porous membrane used to retain the solids |
| C. | The solids which are present on the filter |
| D. | A suspension to be filtered |
| Answer» D. A suspension to be filtered | |
| 10. |
The slurry is ______________ |
| A. | A suspension to be filtered |
| B. | A porous membrane used to retain the solids |
| C. | The solids which are present on the filter |
| D. | A clear liquid passing through the filter |
| Answer» B. A porous membrane used to retain the solids | |
| 11. |
In surface filtration, the size of particles retained is higher than the mean pore size of the medium. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
Filtration is a steady state. |
| A. | True |
| B. | False |
| Answer» C. | |
| 13. |
Which of the following does not influence filtration? |
| A. | Temperature |
| B. | Density |
| C. | Viscosity |
| D. | pH |
| Answer» E. | |
| 14. |
In which of the following the size of particles retained is much smaller than the pore size of the medium? |
| A. | Batch filtration |
| B. | Surface filtration |
| C. | Submerged filtration |
| D. | Depth filtration |
| Answer» E. | |
| 15. |
Which of the following is not an advantage of PES membrane filters? |
| A. | Low extractables |
| B. | Fast flow |
| C. | High protein binding |
| D. | High throughput |
| Answer» D. High throughput | |
| 16. |
The advantage of cellulose acetate filters is ________________ |
| A. | Recovery of microorganisms |
| B. | Low throughput |
| C. | High protein binding |
| D. | Low flow rates |
| Answer» B. Low throughput | |
| 17. |
Which of the following filter is used in the filtration of bacteria? |
| A. | Bottle top filters |
| B. | Oxalate filters |
| C. | Cellulose Acetate filters |
| D. | PES membrane filters |
| Answer» D. PES membrane filters | |
| 18. |
Which of the following filters are ideal for vitamin sterilization? |
| A. | Bottle top filters |
| B. | Cellulose Nitrate filters |
| C. | Cellulose Acetate filters |
| D. | PES membrane filters |
| Answer» B. Cellulose Nitrate filters | |
| 19. |
Which of the following is not the application of filtration? |
| A. | Sterilization of media |
| B. | Removal of debris |
| C. | Plasma clarification |
| D. | Off-gas analysis |
| Answer» E. | |
| 20. |
The pore size for the removal of viruses is _______________ |
| A. | 20 nm |
| B. | 30 nm |
| C. | 25 nm |
| D. | 35 nm |
| Answer» B. 30 nm | |
| 21. |
What is the pore size of the filtration membrane to remove bacteria? |
| A. | 0.25 µm |
| B. | 0.22 µm |
| C. | 0.27 µm |
| D. | 0.26 µm |
| Answer» C. 0.27 µm | |
| 22. |
In which of the following, both primary and secondary tanks are used? |
| A. | Two stage sludge digesters |
| B. | Single stage sludge digesters |
| C. | Low rate digesters |
| D. | High rate digesters |
| Answer» B. Single stage sludge digesters | |
| 23. |
The minimum size of sludge digestion tank is ___________ |
| A. | 0.5m |
| B. | 1m |
| C. | 2m |
| D. | 3m |
| Answer» E. | |
| 24. |
The maximum BOD removal efficiency of the Step aeration process of the activated sludge system is ___________ |
| A. | 92% |
| B. | 80% |
| C. | 99% |
| D. | 78% |
| Answer» B. 80% | |
| 25. |
Which of the following activated sludge process has minimum food to microorganism ratio? |
| A. | Extended aeration |
| B. | Step aeration |
| C. | Modified aeration |
| D. | Conventional |
| Answer» B. Step aeration | |
| 26. |
BOD of sewage is dependent on food to microorganism ratio. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 27. |
The maximum temperature at which thermophilic microorganisms remain active in sludge digester is ___________ |
| A. | 60°C |
| B. | 40°C |
| C. | 30°C |
| D. | 20°C |
| Answer» B. 40°C | |
| 28. |
_________ is defined as a volume in ml occupied by 1 gram of solid in the mixed liquor after 30 minutes of settling. |
| A. | BOD loading |
| B. | Suspended solid volume |
| C. | Sludge volume index |
| D. | Organic loading |
| Answer» D. Organic loading | |
| 29. |
How many stages are there in the sludge digestion process? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 30. |
Which gas evolves the most in the sludge digestion process? |
| A. | SO₂ |
| B. | CO₂ |
| C. | N₂ |
| D. | CH₄ |
| Answer» E. | |
| 31. |
The sludge digestion process is independent of which of the following? |
| A. | Temperature of sludge |
| B. | pH of sludge |
| C. | Shape of tank |
| D. | Mixing of sludge |
| Answer» D. Mixing of sludge | |
| 32. |
Which of the following has minimum hydraulic retention time? |
| A. | Conventional process |
| B. | Extended process |
| C. | Modified aeration process |
| D. | Complete mix process |
| Answer» D. Complete mix process | |
| 33. |
The design pressure of ____ is applied on pressure type flotation device. |
| A. | 1kg/cm² |
| B. | 2kg/cm² |
| C. | 3kg/cm² |
| D. | 6kg/cm² |
| Answer» D. 6kg/cm² | |
| 34. |
The design Hydraulic loading rate of the gravity thickener is _______ m³/m²/day. |
| A. | 20 |
| B. | 39 |
| C. | 40 |
| D. | 85 |
| Answer» B. 39 | |
| 35. |
In which sludge treatment process, the sludge is treated with chemicals? |
| A. | Dewatering |
| B. | Thickening |
| C. | Conditioning |
| D. | Drying |
| Answer» D. Drying | |
| 36. |
The form of sludge which is free from pathogenic bacteria is ___________ |
| A. | Undigested sludge |
| B. | Digested sludge |
| C. | Primary sludge |
| D. | Supernatant liquor |
| Answer» C. Primary sludge | |
| 37. |
The maximum size of filter media of a percolating filter is ___________ |
| A. | 10mm |
| B. | 25mm |
| C. | 60mm |
| D. | 75mm |
| Answer» E. | |
| 38. |
Which of the following is not a drying bed? |
| A. | Wedwire beds |
| B. | Artificial media |
| C. | Filter press |
| D. | Conventional sand |
| Answer» D. Conventional sand | |
| 39. |
The color of digestive sludge is ___________ |
| A. | Blue |
| B. | Black |
| C. | Brown |
| D. | Gray |
| Answer» C. Brown | |
| 40. |
The BOD after the filtration of sewage from the low rate trickling filter is ___________ |
| A. | 40-50% |
| B. | 80-90% |
| C. | 70-80% |
| D. | 90-99% |
| Answer» C. 70-80% | |
| 41. |
The removal of BOD is independent of the loading conditions in infiltration process. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 42. |
The organic loading in low rate trickling filter is 900 kg/hectare-meter/day. What is the efficiency of the filter? |
| A. | 43.1% |
| B. | 88.3% |
| C. | 7.04% |
| D. | 83% |
| Answer» C. 7.04% | |
| 43. |
Which of the following is called as air diffusion method? |
| A. | Activated sludge aeration |
| B. | Diffused air aeration |
| C. | Mechanical aeration |
| D. | Combined aeration |
| Answer» C. Mechanical aeration | |
| 44. |
The maximum quantity of air required in diffused aerator is ______ m³ per million litres of sewage. |
| A. | 4000 |
| B. | 5000 |
| C. | 6000 |
| D. | 8000 |
| Answer» E. | |
| 45. |
The breaking of the biomass from the slime layer in conventional filter is called _____ |
| A. | Sloughing |
| B. | Carbonation |
| C. | Biological magnification |
| D. | Weathering |
| Answer» B. Carbonation | |
| 46. |
The design solid surface loading in an activated sludge process is ___________ |
| A. | 10 kg/m²/day |
| B. | 25 kg/m²/day |
| C. | 15 kg/m²/day |
| D. | 35 kg/m²/day |
| Answer» C. 15 kg/m²/day | |
| 47. |
Which device is used in the aeration tank for cleaning purposes? |
| A. | Diffuser plate |
| B. | Paddles |
| C. | Tube diffuser |
| D. | Header pipe |
| Answer» D. Header pipe | |
| 48. |
The organic loading in an activated sludge plant is defined as ___________ |
| A. | Mass of BOD per day/Volume of the aeration tank |
| B. | Volume of aeration tank/Mass of BOD per day |
| C. | The mass of BOD per day/Volume of secondary clarifier |
| D. | Aeration period * Volume of aeration tank |
| Answer» B. Volume of aeration tank/Mass of BOD per day | |
| 49. |
The dewatered sludge cannot be disposed by ___________ |
| A. | Composting |
| B. | Heat drying |
| C. | Acid fermentation |
| D. | Incineration |
| Answer» D. Incineration | |
| 50. |
The minimum hydraulic loading of percolating filter is ___________ |
| A. | 1 m³/m²/day |
| B. | 2 m³/m²/day |
| C. | 3 m³/m²/day |
| D. | 4 m³/m²/day |
| Answer» B. 2 m³/m²/day | |