6 questions Advanced

ECADEMY test

Boiler systems

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Question 1 of 6 Advanced

1 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
To build a boiler house in a more economical fashion
To harness the energy from the condenser and reuse it in other parts of the system
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Question 2 of 6 Advanced

2 Why is chemical treatment of the make-up water necessary?
To give the water a distinctive small to avoid confusion with drinking water.
To ensure that scaling is retained in the boiler and not in the piping and equipment.
To prevent scaling in the boiler and the water from turning acidic when heated.
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Question 3 of 6 Advanced

3 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.
When air enters the condensate system and causes bubbles in the water.
Cavitation occurs when the pressure in the first impeller or pipes raise above the vapour pressure of the water.
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Question 4 of 6 Advanced

4 How does an economiser work?
In an economiser condensate is led past a network of flue gas pipes, transferring heat from the condensate to the flue gas.
In an economiser cold flue gas is led past a network of pipes with hot water, transferring heat from the water to the flue gas to avoid condensation.
In an economiser flue gas is led past a network of pipes with cold water, transferring heat from the flue gas to the water.
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Question 5 of 6 Advanced

5 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.
Less than two years.
More than two years.
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Question 6 of 6 Advanced

6 What is the main shortcoming of on/off level control?
It does not maintain a constant level in the boiler
It is the most expensive way of controlling the pumps
The energy consumption on the pumps is ridiculously high
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Question 6 of 6 Advanced

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Correct
01.
Q: What is the purpose of an economiser?
A: To harness the energy of the boiler’s flue gas and reuse it in other parts of the system
Correct
02.
Q: Why is chemical treatment of the make-up water necessary?
A: To prevent scaling in the boiler and the water from turning acidic when heated.
Correct
03.
Q: When does cavitation in the feed pumps occur?
A: Cavitation occurs when the pressure in the first impeller or pipes drops below the vapour pressure of the water.
Correct
04.
Q: How does an economiser work?
A: In an economiser flue gas is led past a network of pipes with cold water, transferring heat from the flue gas to the water.
Correct
05.
Q: What is the typical payback time of installing an economiser in a boiler system?
A: Less than two years.
Correct
06.
Q: What is the main shortcoming of on/off level control?
A: It does not maintain a constant level in the boiler
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