Boiler modulating feedwater control flow rate depends on
a) level set point
b) control valve position
c) actual level
d) feedwater pressure
e) set point, level, and valve position
Answer: E
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Power Engineering Chapter 87
- On a steam boiler with single element feedwater control, the following item is measured:
- In a two element feedwater control the following items are measured:
- A boiler control transfer or selector station
- With single element feedwater control the level transmitter output is
- Which of the following is a flame sensing device?
- The function of a flame failure device is to
- To operate the type of flame failure device which incorporates a lead sulphide cell, it must receive
- A lead sulphide cell is sensitive to IR rays and
- A combustion air proving switch
- On a packaged boiler a number of electrical switches connected in series can be categorized as
- The low water fuel cut-off of an unattended automatically fired heating boiler should shut the fuel off if the water level drops below:
- Modulating combustion control will:
- Modulating pressure controller output:
- A sudden drop in steam pressure causes
- Overheating of boiler heating surfaces due to low water:
- A hot water boiler low water fuel cutoff:
- An automatic boiler On-Off or operating control switch has an adjustment for pressure set-point and another for:
- The low water cut-off of a low pressure steam heating boiler should be tested
- Modulating combustion control on a heating boiler is accomplished by:
- A packaged steam boiler modulating combustion control system will routinely:
- The drain of a hot water boiler low water fuel cutoff should be opened to flush out any debris:
- A steam boiler must be equipped with two low water fuel cut-off devices when the boiler:
- The type of combustion fuel control frequently used on small package boilers, is a/an:
- A mercury switch bulb is under high vacuum and contains inert gas: