MCQOPTIONS
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MCQOPTIONS
This section includes 528 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
The detention period for oxidation ponds is usually kept as |
| A. | 48 hours |
| B. | 24 hours |
| C. | 10 to 15 days |
| D. | 3 months |
| Answer» D. 3 months | |
| 152. |
The detention period in coagulation tanks is usually kept as |
| A. | 1 to 2 minutes |
| B. | 30 to 45 minutes |
| C. | 2 to 6 hours |
| D. | 2 to 6 days |
| Answer» D. 2 to 6 days | |
| 153. |
Which of the following methods of analysis of water distribution system is most suitable for long and narrow pipe system? |
| A. | Circle method |
| B. | Equivalent pipe method |
| C. | Hardy cross method |
| D. | Electrical analysis method |
| Answer» C. Hardy cross method | |
| 154. |
Which of the following unit works in anaerobic conditions? |
| A. | Sludge digestion tank |
| B. | Sedimentation tank |
| C. | Activated sludge treatment |
| D. | Trickling filters |
| Answer» B. Sedimentation tank | |
| 155. |
Alkalinity in water is expressed as milligrams per litre in terms of equivalent |
| A. | Calcium carbonate |
| B. | Magnesium carbonate |
| C. | Sodium carbonate |
| D. | Calcium hydroxide |
| Answer» B. Magnesium carbonate | |
| 156. |
The per capital consumption of a locality is affected by(i) Climatic conditions(ii) Quality of water(iii) Distribution pressure |
| A. | Only (i) |
| B. | Both (i) and (ii) |
| C. | Both (i) and (iii) |
| D. | All (i), (ii) and (iii) |
| Answer» E. | |
| 157. |
Composting and lagooning are the methods of |
| A. | Sludge digestion |
| B. | Sludge disposal |
| C. | Sedimentation |
| D. | Filtration |
| Answer» C. Sedimentation | |
| 158. |
Alum as a coagulant is found to be most effective when pH range of water is |
| A. | 2 to 4 |
| B. | 4 to 6 |
| C. | 6 to 8 |
| D. | 8 to 10 |
| Answer» D. 8 to 10 | |
| 159. |
The process in which the chlorination is done beyond the break point is known as |
| A. | Pre-chlorination |
| B. | Post chlorination |
| C. | Super chlorination |
| D. | Break point chlorination |
| Answer» D. Break point chlorination | |
| 160. |
Which of the following causes a decrease in per capita consumption? |
| A. | Use of metering system |
| B. | Good quality of water |
| C. | Better standard of living of the people |
| D. | Hotter climate |
| Answer» B. Good quality of water | |
| 161. |
The disinfection efficiency of chlorine increases by(i) Decreasing the time of contact(ii) Decreasing the temperature of water(iii) Increasing the temperature of water |
| A. | Only (i) |
| B. | Both (i) and (ii) |
| C. | Both (i) and (iii) |
| D. | Only (iii) |
| Answer» E. | |
| 162. |
As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is |
| A. | Smaller |
| B. | Larger |
| C. | Same |
| D. | None of the above |
| Answer» B. Larger | |
| 163. |
The treatment of water with bleaching powder is known as |
| A. | Pre-chlorination |
| B. | Super chlorination |
| C. | De-chlorination |
| D. | Hypo-chlorination |
| Answer» E. | |
| 164. |
The devices which are installed for drawing water from the sources are called |
| A. | Aquifers |
| B. | Aquiclude |
| C. | Filters |
| D. | Intakes |
| Answer» E. | |
| 165. |
Which of the following compounds is widely used for algae control? |
| A. | Sodium sulphate |
| B. | Copper sulphate |
| C. | Sodium chloride |
| D. | Calcium chloride |
| Answer» C. Sodium chloride | |
| 166. |
The main disadvantage of cement concrete sewers is |
| A. | Less strength |
| B. | Difficulty in construction |
| C. | Difficulty in transportation due to heavy weight |
| D. | Less life |
| Answer» D. Less life | |
| 167. |
The overflow rate for plain sedimentation tanks is about |
| A. | 500 to 750 liters/hour/ m² |
| B. | 1000 to 1250 liters/hour/ m² |
| C. | 1250 to 1500 liters/hour/m² |
| D. | 1500 to 2000 liters/hour/m² |
| Answer» B. 1000 to 1250 liters/hour/ m² | |
| 168. |
The slope of sewer shall be |
| A. | Given in the direction of natural slope of ground |
| B. | Given in the direction opposite to natural slope of ground |
| C. | Zero |
| D. | Steeper than 1 in 20 |
| Answer» B. Given in the direction opposite to natural slope of ground | |
| 169. |
The velocity of flow does not depend on |
| A. | Grade of sewer |
| B. | Length of sewer |
| C. | Hydraulic mean depth of sewer |
| D. | Roughness of sewer |
| Answer» C. Hydraulic mean depth of sewer | |
| 170. |
Standard BOD is measured at |
| A. | 20°C - 1 day |
| B. | 25°C - 3 day |
| C. | 20°C - 5 day |
| D. | 30°C - 5 day |
| Answer» D. 30°C - 5 day | |
| 171. |
The alum, when added as a coagulant in water |
| A. | Does not require alkalinity in water for flocculation |
| B. | Does not affect pH value of water |
| C. | Increases pH value of water |
| D. | Decreases pH value of water |
| Answer» E. | |
| 172. |
The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is |
| A. | 1 |
| B. | 100 |
| C. | Infinite |
| D. | Zero |
| Answer» C. Infinite | |
| 173. |
For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be |
| A. | X/4 |
| B. | X/2 |
| C. | X |
| D. | 2X |
| Answer» C. X | |
| 174. |
The effect of increasing diameter of sewer on the self cleansing velocity is |
| A. | To decrease it |
| B. | To increase it |
| C. | Fluctuating |
| D. | Nil |
| Answer» C. Fluctuating | |
| 175. |
The self cleansing velocity for all sewers in India is usually |
| A. | Less than 1.0 m/sec |
| B. | 1.0 m/sec to 1.2 m/sec |
| C. | 1.5 m/sec to 2.0 m/sec |
| D. | 3.0 m/sec to 3.5 m/sec |
| Answer» C. 1.5 m/sec to 2.0 m/sec | |
| 176. |
The working conditions in imhoff tanks are |
| A. | Aerobic only |
| B. | Anaerobic only |
| C. | Aerobic in lower compartment and anaerobic in upper compartment |
| D. | Anaerobic in lower compartment and aerobic in upper compartment |
| Answer» E. | |
| 177. |
The rate of filtration in slow sand filters in million litres per day per hectare is about |
| A. | 50 to 60 |
| B. | 100 to 150 |
| C. | 500 to 600 |
| D. | 1400 to 1500 |
| Answer» B. 100 to 150 | |
| 178. |
Period of cleaning of slow sand filters is about |
| A. | 24 - 48 hours |
| B. | 10 - 12 days |
| C. | 2 - 3 months |
| D. | 1 - 2 year |
| Answer» D. 1 - 2 year | |
| 179. |
Orthotolidine test is used for determination of |
| A. | Dissolved oxygen |
| B. | Residual chlorine |
| C. | Biochemical oxygen demand |
| D. | Dose of coagulant |
| Answer» C. Biochemical oxygen demand | |
| 180. |
The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called |
| A. | Waste pipe |
| B. | Soil pipe |
| C. | Vent pipe |
| D. | Anti-siphonage pipe |
| Answer» B. Soil pipe | |
| 181. |
The suitable layout of distribution system for a city with roads of rectangular pattern is |
| A. | Grid iron system |
| B. | Dead end system |
| C. | Ring system |
| D. | Radial system |
| Answer» B. Dead end system | |
| 182. |
Average rate of water consumption per head per day as per Indian Standard is |
| A. | 100 liters |
| B. | 135 liters |
| C. | 165 liters |
| D. | 200 liters |
| Answer» C. 165 liters | |
| 183. |
The suitable method of forecasting population for a young and rapidly increasing city is |
| A. | Arithmetical increase method |
| B. | Geometrical increase method |
| C. | Incremental increase method |
| D. | Graphical method |
| Answer» C. Incremental increase method | |
| 184. |
The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is |
| A. | 9500 |
| B. | 9800 |
| C. | 10100 |
| D. | 10920 |
| Answer» E. | |
| 185. |
The settling velocity of a particle in a sedimentation tank depends on |
| A. | Depth of tank |
| B. | Surface area of tank |
| C. | Both depth and surface area of tank |
| D. | None of the above |
| Answer» C. Both depth and surface area of tank | |
| 186. |
For a given discharge, the efficiency of sedimentation tank can be increased by |
| A. | Increasing the depth of tank |
| B. | Decreasing the depth of tank |
| C. | Increasing the surface area of tank |
| D. | Decreasing the surface area of tank |
| Answer» D. Decreasing the surface area of tank | |
| 187. |
The type of valve, which is provided on the suction pipe in a tube-well, is |
| A. | Air relief valve |
| B. | Reflux valve |
| C. | Pressure relief valve |
| D. | Sluice valve |
| Answer» C. Pressure relief valve | |
| 188. |
The ratio of 5 day BOD to ultimate BOD is about |
| A. | 1/3 |
| B. | 2/3 |
| C. | 3/4 |
| D. | 1.0 |
| Answer» C. 3/4 | |
| 189. |
The process of lagooning is primarily a means of |
| A. | Reducing the excessive flow in sewers |
| B. | Disposing of sludge |
| C. | Increasing the capacity of storage reservoirs |
| D. | Increasing flow of sewage through imhoff tanks |
| Answer» C. Increasing the capacity of storage reservoirs | |
| 190. |
Sewerage system is designed for |
| A. | Maximum flow only |
| B. | Minimum flow only |
| C. | Average flow only |
| D. | Maximum and minimum flow |
| Answer» E. | |
| 191. |
If the average daily consumption of a city is 100,000 m³, the maximum daily consumption on peak hourly demand will be |
| A. | 100000 m³ |
| B. | 150000 m³ |
| C. | 180000 m³ |
| D. | 270000 m³ |
| Answer» E. | |
| 192. |
Scour valves are provided |
| A. | At street corners to control the flow of water |
| B. | At every depression and dead ends to drain out the waste water that may collect there |
| C. | At the foot of rising main along the slope to prevent back running of water |
| D. | At every summit of rising mains |
| Answer» C. At the foot of rising main along the slope to prevent back running of water | |
| 193. |
In lime-soda process |
| A. | Only carbonate hardness is removed |
| B. | Only noncarbonated hardness is removed |
| C. | Lime reduces the carbonate hardness and soda-ash removes the non-carbonate hardness |
| D. | Lime reduces the non-carbonate hardness and soda-ash removes the carbonate hardness |
| Answer» D. Lime reduces the non-carbonate hardness and soda-ash removes the carbonate hardness | |
| 194. |
The suitable system of sanitation for area of distributed rainfall throughout the year with less intensity is |
| A. | Separate system |
| B. | Combined system |
| C. | Partially separate system |
| D. | Partially combined system |
| Answer» C. Partially separate system | |
| 195. |
The depression of water table in a well due to pumping will be maximum(Where ‘R’ is the radius of influence) |
| A. | At a distance R from the well |
| B. | Close to the well |
| C. | At a distance R/2 from the well |
| D. | None of the above |
| Answer» C. At a distance R/2 from the well | |
| 196. |
A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called |
| A. | House sewer |
| B. | Lateral sewer |
| C. | Main sewer |
| D. | Sub-main sewer |
| Answer» B. Lateral sewer | |
| 197. |
Hardy cross method of analysis of distribution system(i) Involves successive trials(ii) Takes economic aspects into account(iii) Is time consuming |
| A. | Only (i) |
| B. | (i) and (ii) |
| C. | (i) and (iii) |
| D. | All are correct |
| Answer» D. All are correct | |
| 198. |
The velocity of flow of water in a sedimentation tank is about |
| A. | 5 to 10 cm/sec |
| B. | 15 to 30 cm/sec |
| C. | 15 to 30 cm/minute |
| D. | 15 to 30 cm/hour |
| Answer» D. 15 to 30 cm/hour | |
| 199. |
The time of concentration is defined as |
| A. | The time taken by rainfall water to run from most distant point of water shed to the inlet of sewer |
| B. | The time required for flow of water in sewer to the point under consideration |
| C. | Sum of (A) and (B) |
| D. | Difference of (A) and (B) |
| Answer» D. Difference of (A) and (B) | |
| 200. |
Double filtration is used |
| A. | To increase the filtration slow sand filters capacity of |
| B. | To increase the filtration rapid sand filters capacity of |
| C. | For isolated buildings like pools, hotels etc swimming |
| D. | All of the above |
| Answer» B. To increase the filtration rapid sand filters capacity of | |