Wastewater Treatment Test - 3

1. The design velocity of flow of a detritus tank is ____________

0.9m/Sec

0.5m/Sec

1m/Sec

1.2m/Sec

2. The dimension formula of dynamic viscosity is ____________

ML^-1T^-1

ML^-2T^-2

ML^-1T

ML^-1T^-3

3. The unit of dynamic viscosity is ____________

Metre/Sec

Pa * Sec

Dimensionless

Metre²/Sec

4. A pressure difference of _____________ is applied to the vacuum floatation method to remove impurities from sewage.

2 atm

0.5 atm

1.5 atm

1 atm

5. Which of the following has a minimum detention period?

Oxidation pond

Sludge digestion tank

Skimming tank

Primary sedimentation

6. The relation between dynamic and kinematic viscosity is given by ____________

Dynamic viscosity = Kinematic viscosity * Density of water

Kinematic viscosity = Dynamic viscosity + Density of water

Dynamic viscosity = Kinematic viscosity / Density of water

7. Which of the following has minimum detention period?

Sedimentation tank

Oxidation ditch

Grit chamber

Oxidation pond

8. The coefficient of drag for a transition settling is ____________

CD = 24/R

CD = 8.5/R^0.6

CD = R/24

CD = 18.5/R^0.6

9. The dimension formula of kinematic viscosity is ____________

ML^-1T^-1

L²T^-1

ML^-2T^-2

L^-1T

10. Which of the following device is used for the removal of oil and grease?

Flocculator

Grit chambers

Skimming tank

Tube settlers