Question 1 of 6
Advanced

When does cavitation in the feed pumps occur?

Question 2 of 6
Advanced

What is the purpose of an economiser?

Question 3 of 6
Advanced

What is the typical payback time of installing an economiser in a boiler system?

Question 4 of 6
Advanced

Why are feed valves problematic?

Question 5 of 6
Advanced

What is the main shortcoming of on/off level control?

Question 6 of 6
Advanced

What is direct boiler feed?

Question 6 of 6
Advanced

Happy with your answers?

Submit your current answers and get the final test result.

Test results

Congratulations. You have passed the test and completed the 27 - Boiler systems
Sorry. You did not pass the 27 - Boiler systems test this time
Achieved badges:
How would you rate this course?
1: When does cavitation in the feed pumps occur?
Cavitation occurs when the pressure in the first impeller or pipes drops below the vapour pressure of the water.
1: When does cavitation in the feed pumps occur?
When air enters the condensate system and causes bubbles in the water.
You can find the answer here >
1: When does cavitation in the feed pumps occur?
Cavitation occurs when the pressure in the first impeller or pipes raise above the vapour pressure of the water.
You can find the answer here >
2: What is the purpose of an economiser?
To harness the energy of the boiler’s flue gas and reuse it in other parts of the system
2: What is the purpose of an economiser?
To build a boiler house in a more economical fashion
You can find the answer here >
2: What is the purpose of an economiser?
To harness the energy from the condenser and reuse it in other parts of the system
You can find the answer here >
3: What is the typical payback time of installing an economiser in a boiler system?
Installing an economiser is rarely a good idea and gives very long payback time.
You can find the answer here >
3: What is the typical payback time of installing an economiser in a boiler system?
Less than two years.
3: What is the typical payback time of installing an economiser in a boiler system?
More than two years.
You can find the answer here >
4: Why are feed valves problematic?
They have a tendency to become unstable and start fluctuating
You can find the answer here >
4: Why are feed valves problematic?
Valves cause pressure loss, which increases energy consumption and requires larger pumps
4: Why are feed valves problematic?
Valves cause temperature loss
You can find the answer here >
5: What is the main shortcoming of on/off level control?
It does not maintain a constant level in the boiler
5: What is the main shortcoming of on/off level control?
It is the most expensive way of controlling the pumps
You can find the answer here >
5: What is the main shortcoming of on/off level control?
The energy consumption on the pumps is ridiculously high
You can find the answer here >
6: What is direct boiler feed?
Boiler feed without the use of feed pumps
You can find the answer here >
6: What is direct boiler feed?
Variable speed pumps equipped with level sensors to control the water level
6: What is direct boiler feed?
Boiler feed where the feed water is taken directly from the condensate tank
You can find the answer here >