Residential HVAC Installation Practice Exam

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Prepare for the Residential HVAC Installation Exam with this comprehensive quiz. Test your knowledge with multiple-choice questions and get ready to excel in your HVAC installation career.

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If the equivalent length of a transition piece of ductwork is 10 feet and the main duct in series with it is 20 feet, what is the length used to estimate the total frictional loss?

5 feet
15 feet
25 feet
30 feet

The correct answer is: 30 feet

In this case, when two pieces of ductwork are in series, the total equivalent length for estimating total frictional loss is calculated by simply adding the individual equivalent lengths together. In this scenario, the equivalent length of the transition piece of ductwork (10 feet) is added to the main duct's length (20 feet) in series with it. Therefore, the total estimated length for calculating total frictional loss would be 10 feet (from the transition piece) + 20 feet (from the main duct) = 30 feet. This total length of 30 feet is used to estimate the total frictional loss in the ductwork system.