Тест по вспомогательным котельным установкам (CES v5.0)
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Правильні відповіді:
1
A burner should never be ignited on a hot furnace wall because:
Ваша відповідь правильна:
There could be danger of explosion.
2
After the economizer the feed water is entering:
Ваша відповідь правильна:
A perforated feed pipe inside the upper secondary drum.
3
Before firing the boiler, the oil is heated and re-circulated to:
Ваша відповідь правильна:
So that it is at the correct viscosity at the burners.
4
For how long should you be firing the boiler before you reach working pressure?
Ваша відповідь правильна:
Depending on the size and design of the actual boiler.
5
For how long should you be purging before you fire the boiler?
Ваша відповідь правильна:
2-4 minutes.
6
How do we maintain a constant steam pressure?
Ваша відповідь правильна:
By controlling the amount of heat supplied to the boiler water.
7
How is the circulation of the water inside the boiler obtained?
Ваша відповідь правильна:
By the boiler design including placement of burners and direction of forced draft.
8
How is water in the primary steam system circulated?
Ваша відповідь правильна:
By the difference in density of steam and water.
9
If the water level is too high during firing you should:
Ваша відповідь правильна:
Blow off some water through the foam blowing valve.
10
Is the boiler trip system an integrated part of the boiler control system?
Ваша відповідь правильна:
It has to be a separate system.
11
It is very important to have steam flow through super-heater, because close to the burners the temperatures can be:
Ваша відповідь правильна:
Close to 2 000 °C.
12
On Boilers with High Steam production, combined with low water content, the level control system is based on:
Ваша відповідь правильна:
Water level, steam consumption and feed water supply.
13
The Burner Management system will fire and shut off the burners in sequence to:
Ваша відповідь правильна:
Adjust the boiler load.
14
The Density of water is:
Ваша відповідь правильна:
30 times that of steam.
15
The vent valve on boiler must be kept open when boiler is depressurized:
Ваша відповідь правильна:
To prevent vacuum formation inside boiler shell.
16
What is a dual pressure boiler?
Ваша відповідь правильна:
Steam from a primary system is heating the secondary system.
17
What is a good indication on when to start soot blowing?
Ваша відповідь правильна:
When the exhaust temperature after the air preheater has increased approximately 10 °C.
18
What is the function of a “high/low selector”?
Ваша відповідь правильна:
To select fuel/air lead/lag during reducing/increasing boiler load.
19
What is the purpose of the deaerator?
Ваша відповідь правильна:
To remove air and other non-condensable gasses from the feed water.
20
What is typical steam consumption for a soot blower of the multi dual nozzle type?
Ваша відповідь правильна:
2 kg/s.
21
When the water is heated at constant pressure, which of the following happens?
Правильну відповідь:
The temperature will increase until we reach the saturation temperature.
Ваша відповідь:
The behaviour of the heated water is unpredictable.
22
Which of the following is not an advantage of Dual Pressure boilers?
Правильну відповідь:
The temperature will rise above the evaporation temperature.
Ваша відповідь:
The Heating Surface will always be cooled by water flow.
23
Which of the following statements is not correct?
Ваша відповідь правильна:
Some of the Energy content from the steam is converted to mechanical energy at the turbine.
24
Why are we often using a cascade control system in combustion control applications?
Ваша відповідь правильна:
To achieve the best possible process stability.
25
Why is it good practice to blow through the tubing to pressure and level gauges?
Ваша відповідь правильна:
To check, that the tubes and connections are not blocked.
26
Why shall the combustion air blowers be running for a while after you have closed the oil to the burners?
Ваша відповідь правильна:
To remove all gasses from the furnace.
27
Why should the condensate temperature be as high as possible?
Правильну відповідь:
To minimize the energy loss in the condenser.
Ваша відповідь:
To increase the vacuum in the condenser.
28
Will the secondary steam drum pressure be above or below the primary steam drum pressure?
Ваша відповідь правильна:
Below.
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