McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 151. |
Grit chamber is similar to which of the following? |
| A. | Screening unit |
| B. | Sedimentation tank |
| C. | Coagulation tank |
| D. | Sand bed |
| Answer» B. Sedimentation tank | |
| 152. |
What is the specific gravity of settleable particles in the grit chamber? |
| A. | 2.98 |
| B. | 2.56 |
| C. | 2.65 |
| D. | 2.89 |
| Answer» C. 2.65 | |
| 153. |
Stoke’s law holds good for Reynolds’s number ______ |
| A. | Less than 1 |
| B. | Equal to 1 |
| C. | Greater than 1 |
| D. | Nearer to 1 |
| Answer» A. Less than 1 | |
| 154. |
What is the horizontal velocity considered for grit chamber? |
| A. | 0.25-0.4m/sec |
| B. | 0.6-0.9 m/sec |
| C. | 1-2 m/sec |
| D. | 3-4m/sec |
| Answer» A. 0.25-0.4m/sec | |
| 155. |
What is the detention time considered for aerated grit chamber? |
| A. | 5-6 mins |
| B. | 2-5 mins |
| C. | 1-2 mins |
| D. | 3-4 mins |
| Answer» B. 2-5 mins | |
| 156. |
Which of these is not a grit removal equipment installed in the aerated grit chamber? |
| A. | Screw conveyers |
| B. | Tubular conveyers |
| C. | Jet pumps |
| D. | Communitors |
| Answer» D. Communitors | |
| 157. |
What is the amount of air supplied for these grit chambers? |
| A. | 1-2 m3/m.min |
| B. | 0.2-0.5 m3/m.min |
| C. | 0.5-0.8 m3/m.min |
| D. | 0.8-1 m3/m.min |
| Answer» B. 0.2-0.5 m3/m.min | |
| 158. |
At what depth are the air diffusers placed in the grit chamber? |
| A. | 0.6-0.9 m |
| B. | 1-2 m |
| C. | 0.1-0.4m |
| D. | 0.45-0.6 m |
| Answer» D. 0.45-0.6 m | |
| 159. |
What is the amount of grit quantities captured by the aerated grit chamber? |
| A. | 0.004-0.20 m3/103.m3 |
| B. | 0.25 m3/103.m3 |
| C. | <0.004 m3/103.m3 |
| D. | 0.5 m3/103.m3 |
| Answer» A. 0.004-0.20 m3/103.m3 | |
| 160. |
Usually while designing what is the range of the width of the aerated grit chamber assumed? |
| A. | 0.5-2 m |
| B. | 8-10 m |
| C. | 2.5-7.0m |
| D. | 12m |
| Answer» C. 2.5-7.0m | |
| 161. |
Usually while designing what is the range of length of the aerated grit chamber assumed? |
| A. | 7.5-20 |
| B. | 4-6 m |
| C. | 25 m |
| D. | 50 m |
| Answer» A. 7.5-20 | |
| 162. |
Usually while designing what is the range of depth of the aerated grit chamber assumed? |
| A. | 0.5-2 m |
| B. | 8-10 m |
| C. | 2-5 m |
| D. | 12 m |
| Answer» C. 2-5 m | |
| 163. |
Aerated grit chambers are usually designed to remove particles in which range of size? |
| A. | 0.1mm diameter |
| B. | 0.35 mm diameter |
| C. | 0.21 mm diameter |
| D. | 0.41 mm diameter |
| Answer» C. 0.21 mm diameter | |
| 164. |
Activated sludge process degrade organics and _________ |
| A. | Improve nutrients |
| B. | Remove nutrients |
| C. | Remove odour |
| D. | Remove taste |
| Answer» B. Remove nutrients | |
| 165. |
What is required to keep the activated sludge suspended? |
| A. | Carbon-dioxide |
| B. | Nitrogen |
| C. | Oxygen |
| D. | Ammonia |
| Answer» C. Oxygen | |
| 166. |
What does the bacterium use to grow? |
| A. | Oxygen |
| B. | Organic pollutants |
| C. | Water |
| D. | Carbon-dioxide |
| Answer» B. Organic pollutants | |
| 167. |
________ combines aeration basin and secondary clarifier into single unit. |
| A. | Primary clarifier |
| B. | Aerobic unit |
| C. | Sequential batch reactor |
| D. | Secondary clarifier |
| Answer» C. Sequential batch reactor | |
| 168. |
What does SBR stand for? |
| A. | Secondary batch reactor |
| B. | Sequential biological reactor |
| C. | Secondary biological reactor |
| D. | Sequential batch reactor |
| Answer» D. Sequential batch reactor | |
| 169. |
SBR operates as ________ process. |
| A. | Batch |
| B. | Continuous |
| C. | Semi-continuous |
| D. | Discontinuous |
| Answer» A. Batch | |
| 170. |
When the aeration system shuts off, the basin begins to perform as a ______ |
| A. | Primary clarifier |
| B. | Secondary clarifier |
| C. | Anaerobic unit |
| D. | Aeration unit |
| Answer» B. Secondary clarifier | |
| 171. |
_______ provides the dual purpose of providing DO and mixing of the mixed liquor and wastewater. |
| A. | Flocculation |
| B. | Aeration |
| C. | Sedimentation |
| D. | Clarification |
| Answer» B. Aeration | |
| 172. |
Ion-exchange resin is ____________ |
| A. | Linear |
| B. | Low molecular weight |
| C. | Organic polymer with porous structure |
| D. | Soluble |
| Answer» C. Organic polymer with porous structure | |
| 173. |
Which of the following ion get released from the cation exchange column? |
| A. | H+ |
| B. | Na+ |
| C. | K+ |
| D. | Ca+2 |
| Answer» A. H+ | |
| 174. |
Which of the following ion get released from the anion exchange column? |
| A. | CO3-2 |
| B. | OH– |
| C. | Cl– |
| D. | SO4-2 |
| Answer» B. OH– | |
| 175. |
Ion-free water coming out from the exchanger is known as ____________ |
| A. | Potable water |
| B. | Disinfected water |
| C. | Coagulated water |
| D. | Demineralised water |
| Answer» D. Demineralised water | |
| 176. |
Which of the following statement is incorrect about the demineralised water? |
| A. | It is as pure as distilled water |
| B. | It is very good for use in high pressure boilers |
| C. | It is fit for domestic use |
| D. | It can be made either by distillation or by using cation and anion exchangers |
| Answer» C. It is fit for domestic use | |
| 177. |
The exhausted cation exchange column is regenerated by passing a solution of ____________ |
| A. | Dil. HCl |
| B. | Dil. NaCl |
| C. | Conc. HCl |
| D. | Conc. NaCl |
| Answer» A. Dil. HCl | |
| 178. |
The exhausted anion exchange column is regenerated by passing a solution of ____________ |
| A. | Dil. KOH |
| B. | Conc. KOH |
| C. | Conc. NaOH |
| D. | Dil. NaOH |
| Answer» D. Dil. NaOH | |
| 179. |
In ion-exchange process, the capital cost is _________ and the operational expenses are ______________ |
| A. | Low, high |
| B. | High, low |
| C. | High, high |
| D. | Low, low |
| Answer» C. High, high | |
| 180. |
The residual hardness in ion-exchange process is ____________ |
| A. | 0-2 ppm |
| B. | 5-10 ppm |
| C. | 10-15 ppm |
| D. | 20-30 ppm |
| Answer» A. 0-2 ppm | |
| 181. |
How many oxygen atoms are present in the ozone? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 182. |
_______ is produced by subjecting oxygen to high electric voltage. |
| A. | Carbon-monoxide |
| B. | Carbon-dioxide |
| C. | Pure oxygen |
| D. | Ozone |
| Answer» D. Ozone | |
| 183. |
Which of the following can be inactivated using ozone? |
| A. | Algae |
| B. | Fungi |
| C. | Protozoa |
| D. | All microbes |
| Answer» C. Protozoa | |
| 184. |
Which of these is not an advantage of Ozonation? |
| A. | Reaction with bacteria |
| B. | Organics degradation |
| C. | Equipment costs |
| D. | Chemicals |
| Answer» C. Equipment costs | |
| 185. |
Which of the following is not a disadvantage of Ozonation? |
| A. | Chemicals |
| B. | Costs |
| C. | Energy |
| D. | Fire hazard |
| Answer» A. Chemicals | |
| 186. |
Which of the following is not removed by Ozonation? |
| A. | Iron |
| B. | Manganese |
| C. | Magnesium |
| D. | Bacteria |
| Answer» C. Magnesium | |
| 187. |
What is the maximum time required for ozone degradation? |
| A. | 15 minutes |
| B. | 30 minutes |
| C. | 45 minutes |
| D. | 60 minutes |
| Answer» B. 30 minutes | |
| 188. |
What is the average ozone concentration created during Ozonation? |
| A. | 1000 mg/l |
| B. | 5000 mg/l |
| C. | 10000 mg/l |
| D. | 15000 mg/l |
| Answer» C. 10000 mg/l | |
| 189. |
Which of the following is not correct regarding Ozonation? |
| A. | Does not requires chemicals |
| B. | Eliminates bad taste |
| C. | Eliminates odour |
| D. | Operational costs are low |
| Answer» D. Operational costs are low | |
| 190. |
What is the colour of ozone? |
| A. | Violet |
| B. | White |
| C. | Grey |
| D. | Colourless |
| Answer» D. Colourless | |
| 191. |
Ozone is formed by the interaction of _______ |
| A. | UV or O2 |
| B. | O and O2 |
| C. | O and UV |
| D. | O2 and CO |
| Answer» A. UV or O2 | |
| 192. |
In which year was the structure of ozone determined? |
| A. | 1865 |
| B. | 1875 |
| C. | 1885 |
| D. | 1895 |
| Answer» A. 1865 | |
| 193. |
In which year was the ozone named? |
| A. | 1829 |
| B. | 1839 |
| C. | 1849 |
| D. | 1859 |
| Answer» B. 1839 | |
| 194. |
At what pH ozonation is carried out? |
| A. | 8 |
| B. | 9 |
| C. | 11 |
| D. | 7 |
| Answer» A. 8 | |
| 195. |
Photo catalysis uses which of the following methods to produce free radicals? |
| A. | UV rays |
| B. | UV + TiO2 |
| C. | Ozone + UV |
| D. | TiO2 |
| Answer» B. UV + TiO2 | |
| 196. |
How is the electrical requirement for the ozonation process expressed mathematically? |
| A. | EE/O =EEt/ Vlog(Ci-Cf) |
| B. | EE/O =EEt/ (Ci-Cf) |
| C. | EE/O =EEt Vlog(Ci-Cf) |
| D. | EE/O =EEt(Ci-Cf) |
| Answer» A. EE/O =EEt/ Vlog(Ci-Cf) | |
| 197. |
What are the byproducts of the breakdown of the organic compounds by UV rays? |
| A. | CO |
| B. | CO2 + H2O |
| C. | H2CO3 and water |
| D. | CO + H2O |
| Answer» B. CO2 + H2O | |
| 198. |
In what range is the EE/O present in order to reduce one log of reduction? |
| A. | 0-20 KWH |
| B. | 20-265 KWH |
| C. | 265-365 KWH |
| D. | 365-650 KWH |
| Answer» B. 20-265 KWH | |
| 199. |
Primary sludge includes __________ |
| A. | Total suspended solids |
| B. | Suspended solids |
| C. | Removable solids |
| D. | Settleable solids |
| Answer» D. Settleable solids | |
| 200. |
Which of the following methods are used in rural communities? |
| A. | Aerobic digestion |
| B. | Mechanical dewatering |
| C. | Dewatering |
| D. | Composting |
| Answer» D. Composting | |
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