A combustion air proving switch
a) senses O2 content of the air
b) senses flue gas pressure
c) detects O2 in flue gas
d) senses windbox pressure
e) senses air temperature
Answer: D
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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
- Boiler modulating feedwater control flow rate depends on
- 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
- 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: