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6 questions Advanced

## ECADEMY test

### 20 - Mixing in Wastewater Treatment

This course test contains 6 questions and can be retaken at any time.

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**Q:**Why is it important to position mixers correctly?

**A:**To prevent the propellers from breaking

**01:**To prevent the propellers from breaking Your answer

**02:**To neutralise vortices

**03:**To maximise the total bulk flow

**Q:**Why is it important to position mixers correctly?

**A:**To neutralise vortices

**01:**To prevent the propellers from breaking

**02:**To neutralise vortices Your answer

**03:**To maximise the total bulk flow

**Q:**Why is it important to position mixers correctly?

**A:**To maximise the total bulk flow

**Q:**How much was the average velocity of the volume improved by?

**A:**20%

**01:**20% Your answer

**02:**25%

**03:**30%

**Q:**How much was the average velocity of the volume improved by?

**A:**25%

**01:**20%

**02:**25% Your answer

**03:**30%

**Q:**How much was the average velocity of the volume improved by?

**A:**30%

**Q:**What is the main purpose of a closed loop tank?

**A:**To create a steady, circulated flow

**Q:**What is the main purpose of a closed loop tank?

**A:**To ensure a more energy-efficient solution

**01:**To create a steady, circulated flow

**02:**To ensure a more energy-efficient solution Your answer

**03:**To prevent damaging backflow

**Q:**What is the main purpose of a closed loop tank?

**A:**To prevent damaging backflow

**01:**To create a steady, circulated flow

**02:**To ensure a more energy-efficient solution

**03:**To prevent damaging backflow Your answer

**Q:**Which of these describe the specific mixing power?

**A:**The ratio between the propeller power and the liquid volume

**Q:**Which of these describe the specific mixing power?

**A:**The ratio between the liquid volume and the solid particles

**01:**The ratio between the propeller power and the liquid volume

**02:**The ratio between the liquid volume and the solid particles Your answer

**03:**The ratio between the propeller power and propeller size

**Q:**Which of these describe the specific mixing power?

**A:**The ratio between the propeller power and propeller size

**01:**The ratio between the propeller power and the liquid volume

**02:**The ratio between the liquid volume and the solid particles

**03:**The ratio between the propeller power and propeller size Your answer

**Q:**Where do vortices develop if the propeller is too close to the water surface?

**A:**At the front of the propeller

**01:**At the front of the propeller Your answer

**02:**At the rear of the propeller

**03:**Underneath the propeller

**Q:**Where do vortices develop if the propeller is too close to the water surface?

**A:**At the rear of the propeller

**Q:**Where do vortices develop if the propeller is too close to the water surface?

**A:**Underneath the propeller

**01:**At the front of the propeller

**02:**At the rear of the propeller

**03:**Underneath the propeller Your answer

**Q:**What is the aim of thrust-to-power sizing?

**A:**Maintain a steady momentum and a constant required thrust rate

**01:**Maintain a steady momentum and a constant required thrust rate Your answer

**02:**Deliver a sufficient thrust with the least possible energy consumption

**03:**Run the power at the limit to deliver maximum thrust when necessary

**Q:**What is the aim of thrust-to-power sizing?

**A:**Deliver a sufficient thrust with the least possible energy consumption

**Q:**What is the aim of thrust-to-power sizing?

**A:**Run the power at the limit to deliver maximum thrust when necessary

**01:**Maintain a steady momentum and a constant required thrust rate

**02:**Deliver a sufficient thrust with the least possible energy consumption

**03:**Run the power at the limit to deliver maximum thrust when necessary Your answer