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Question:
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Air is forced into the combustion chamber by ______ fan or blower to maintain a positive pressure in boiler:
Forced Draft
______ boilers are used extensively for comfort heating applications:
Water tube
A _______ fuel oil to air ratio causes sooting and low burner efficiency:
Higher
Operation of the boiler or furnace with excess air by 10% may reduce boiler efficiency by about _______ :
1%
A layer of soot or scale having 0.18 inches thick can reduce heat transfer by:
70%
All oils are converted to vapors before they burn
True
The heating capacity of electric heating systems is usually expressed in which of the following units
kilowatts
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