Discussion
Put the steps of measuring the flow in a duct with an anemometer in order.
1. Compute the volume flow from the mean velocity and the area 2. Measure the free cross-sectional area 3. Take readings at several points across the section 4. Average the readings
Answer: A
The area is established first because it is fixed, then the velocity is sampled across the section because it is not uniform, and the mean of those samples is what multiplies the area. A single centre reading overstates the mean appreciably.
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