Test: Grit Chambers, Tanks And Vacuum Floatation
9 Questions MCQ Test Environmental Engineering | Test: Grit Chambers, Tanks And Vacuum Floatation
The unit of dynamic viscosity is
Explanation: The dynamic viscosity is the ratio of shear stress to velocity gradient. Its unit is Pa * Sec.
Which of the following has minimum detention period?
Explanation: Grit chamber has a minimum detention period with a value of 40-60 seconds.
The relation between dynamic and kinematic viscosity is given by
Explanation: μ = v * ρ, μ = dynamic viscosity, v = kinematic viscosity and ρ = density of water.
The dimension formula of dynamic viscosity is
Explanation: The dimension formula of dynamic viscosity is ML-1T-1 and it can be measured in kg m-1 s-1.
The dimension formula of kinematic viscosity is
Explanation: The dimension formula of kinematic viscosity = ML-1T-1 / ML-3 = L2 T-1.
The coefficient of drag for a transition settling is
Explanation: When Reynolds number ‘R’ lies between 1 and 1000, the coefficient of drag CD is given by CD = 18.5/R0.6.
In which of the following, large impurities are attached with air bubbles to remove it from the wastewater?
Explanation: In skimming tanks, large impurities are attached with air bubbles to decrease its density, they float in sewage and are finally removed by skimming troughs.
Which of the following has minimum detention period?
Explanation: The skimming tank has a minimum detention period with a value of 3 minutes.
The design velocity of flow of a detritus tank is
Explanation: The detritus tanks are able to remove grit and sand particles by having a design velocity of 0.9m/Sec.
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