6 questions Basic

ECADEMY test

27 - Boiler systems

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Question 1 of 6 Basic

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 Basic

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 3 of 6 Basic

What is the purpose of the condenser?
To ensure that no pockets of steam remain in the condensate when returning to the Boiler house.
To ensure that the temperature of the condensate is lower than the make-up water.
To utilize the remaining heat in the condensate to preheat the make-up water.
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Question 4 of 6 Basic

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 5 of 6 Basic

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 Basic

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 6 of 6 Basic

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Correct
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
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
Q: What is the purpose of the condenser?
A: To ensure that no pockets of steam remain in the condensate when returning to the Boiler house.
Correct
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
Q: What is the main shortcoming of on/off level control?
A: It does not maintain a constant level in the boiler
Correct
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.
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