Question 275Steam Plants - Assistant Engineer

The correct answer is A) 14.44 pounds. The weight of air per pound of fuel when operating a boiler at 5% excess air can be calculated as follows: The theoretical quantity of dry air required to burn one pound of fuel oil is 13.75 pounds. With 5% excess air, the total air required would be 13.75 * 1.05 = 14.44 pounds per pound of fuel. The other options are incorrect because they do not properly account for the 5% excess air requirement. B) 15.13 pounds, C) 15.81 pounds, and D) 16.50 pounds all represent higher excess air percentages, which would result in more air per pound of fuel than the 5% specified in the question.