Sedimentation MCQs : Here you will find MCQ Questions related to "Sedimentation" in Environmental Engineering. These Sedimentation MCQ Questions Will help you to improve your Environmental Engineering knowledge and will prepare you for various Examinations like Competitive Exams, Placements, Interviews and other Entrance Exmaniations.
______________ is the process of allowing particles in suspension in water to settle out of the suspension under the effect of gravity.
B. Water Demand
C. Population Forecasting
Explanation: Sedimentation is the process of allowing particles in suspension in water to settle out of the suspension under the effect of gravity
The particles that settle out from the suspension become sediment, and in water treatment is known as?
Explanation: The particles that settle out from the suspension become sediment, and in water treatment is known as sludge.
Which of the following is not a methods for applying sedimentation?
A. horizontal flow
B. radial flow
C. inclined plate
D. None of the above
Explanation: There is a variety of methods for applying sedimentation and include: horizontal flow, radial flow, inclined plate, ballasted floc and floc blanket sedimentation.
How many basic forms of sedimentation are there?
Explanation: The theory reflects two basic forms of sedimentation: unhindered and hindered settling.
When impurities are separated by the gravitation of settling particles, the operation is called _____
A. Sedimentation with coagulant
B. Plain sedimentation
C. Secondary sedimentation
Explanation: In plain sedimentation, impurities are separated from a suspending fluid by use of natural forces like gravitational forces.
In which type of sedimentation, flocculent suspension of intermediate concentration takes place?
A. Type I sedimentation
B. Type II sedimentation
C. Type III sedimentation
D. Type IV sedimentation
Explanation: In type III sedimentation, inter-particle forces hold the particle together and flocculent suspension of intermediate concentration takes place.
The average time required by water to pass through the settling tank is called _______
A. Detention time
B. Mean Time
C. Time of flow
D. Flowing through period
Explanation: The average time required by water to pass through the settling tank is called ‘flowing through period’ which is always less than the detention period.
Range of Displacement efficiency in the plain sedimentation tank is ___________
Explanation: Displacement efficiency is defined as the ratio of flowing through period to the detention period and varies from 0.25 to 0.5 in the plain sedimentation tank.
What is formed when coagulant is added to water?
Explanation: When coagulant is added to water, then white gelatinous precipitate is formed called floc.
What is the dimension formula of mean velocity gradient?
Explanation: Mean velocity gradient is expressed in metre per second/m or Sec-1, so it has dimension formula of 1/T.