### Mixing in Wastewater Treatment

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

You must answer all questions correctly to pass the test and complete the course.

1 Why is it important to position mixers correctly?

2 How much was the average velocity of the volume improved by?

3 Which of these describe the specific mixing power?

4 What is the aim of thrust-to-power sizing?

5 What is the main purpose of a closed loop tank?

# Test results

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01.
Q: Why is it important to position mixers correctly?
A: To prevent the propellers from breaking
02: To neutralise vortices
03: To maximise the total bulk flow
01.
Q: Why is it important to position mixers correctly?
A: To neutralise vortices
01: To prevent the propellers from breaking
03: To maximise the total bulk flow
01.
Q: Why is it important to position mixers correctly?
A: To maximise the total bulk flow
02.
Q: How much was the average velocity of the volume improved by?
A: 20%
02: 25%
03: 30%
02.
Q: How much was the average velocity of the volume improved by?
A: 25%
01: 20%
03: 30%
02.
Q: How much was the average velocity of the volume improved by?
A: 30%
03.
Q: Which of these describe the specific mixing power?
A: The ratio between the propeller power and the liquid volume
03.
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
03.
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
04.
Q: What is the aim of thrust-to-power sizing?
A: 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
04.
Q: What is the aim of thrust-to-power sizing?
A: Deliver a sufficient thrust with the least possible energy consumption
04.
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
05.
Q: What is the main purpose of a closed loop tank?
A: To create a steady, circulated flow
05.
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
03: To prevent damaging backflow
05.
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
06.