If the theoretical quantity of dry air required to burn one pound of fuel oil is 13.75 pounds, what is the weight of air per pound of fuel when operating a boiler at 5% excess air?
• Theoretical air requirement versus excess air in combustion • How to express percent excess air as a multiplier on the theoretical air • Basic percentage math: converting 5% into a factor to adjust the base value
• Start with the given theoretical air per pound of fuel. How do you change this value when you add 5% more than theoretically required? • How do you convert 5% into a decimal, and how is that used to increase a base quantity? • After you calculate the new air requirement, which answer choice is closest to your computed value?
• Be sure you are increasing, not decreasing, the 13.75-pound value, because excess air means more than theoretical. • Confirm you used 5% = 0.05 correctly in your multiplication step. • Double‑check the final result before matching it to the nearest choice in the options.
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