What is used to purge combustibles from the firebox in natural draft furnaces?
A. Fans
B. Steam
C. Water
D. Coolers
A. Incorrect. In forced, induced, or balanced draft furnaces, fans are used to purge combustibles from the firebox with air.
B. Correct. In natural draft furnaces, steam is used to purge combustibles from the firebox.
C. Incorrect. In natural draft furnaces, steam is used to purge combustibles from the firebox.
D. Incorrect. In natural draft furnaces, steam is used to purge combustibles from the firebox.
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(10 k?) * (1 mA) =
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