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This set of MCQs helps students to learn about sedimentation which s 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 sludge.
In which type of settling, sedimentation of discrete particles takes place?
In which settling type, dilute suspension of particles takes place?
In which type of sedimentation, flocculent suspension of intermediate concentration takes place?
In which type of sedimentation, flocculent suspension of high concentration takes place?
What is the settling velocity of the particle if its diameter is 2 * 10-3cm. Given G=2.65, viscosity v=8 * 10-3cm2/Sec?
In a rectangular horizontal flow tank, the maximum permissible velocity is ____ m/Sec.
In a fill and draw type sedimentation tank, a detention period of ____ hours is provided.
Which of the following represents the correct relation between displacement velocity and diameter of the particle?
What will be the surface area of the basin for a flow of 2*106 litre per day having a surface loading rate 10,000 litre/day/m2?
1cm per second settling velocity corresponds to a surface loading of ______ litre per day per m2.
When impurities are separated by the gravitation of settling particles, the operation is called _____.
Sedimentation with coagulant
Plain sedimentation
Secondary sedimentation
Disinfection
When impurities are separated by the gravitation of settling particles, the operation is called _____.
Sedimentation with coagulant
Plain sedimentation
Secondary sedimentation
Disinfection
The detention period of a rectangular tank is given by _______.
t0 = LBH/Q
t0 = LB/HQ
t0 = Q/LBH
t0 = HQ/LB
The average time required by water to pass through the settling tank is called _______.
Detention time
Flowing through period
Time of flow
Mean time
Range of Displacement efficiency in the plain sedimentation tank is ___________.
0.25-0.5
0.1-0.2
0.5-0.8
0.3-0.6
Settling velocity of a spherical body in a viscous fluid is given by ___________.
Reynolds law
Newton’s law
Stokes law
Charles law
