Refrigeration & Air Conditioning Mechanic Red Seal · Question
During an airflow measurement using a hot-wire anemometer in a 400 mm x 400 mm duct, 16 traverse points were taken. The average velocity reading was 3.5 m/s. What is the approximate air volume flow rate?
The volume flow rate is calculated by multiplying the average velocity by the duct's cross-sectional area. Area = 0.4 m × 0.4 m = 0.16 m². Volume Flow Rate = 3.
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Question: During an airflow measurement using a hot-wire anemometer in a 400 mm x 400 mm duct, 16 traverse points were taken. The average velocity reading was 3.5 m/s. What is the approximate air volume flow rate?
Answer options: ✅ 0.56 m³/s
- 5.6 m³/s
- 0.056 m³/s
- 0.48 m³/s
Correct answer: 0.56 m³/s
Explanation: The volume flow rate is calculated by multiplying the average velocity by the duct's cross-sectional area. Area = 0.4 m × 0.4 m = 0.16 m². Volume Flow Rate = 3.5 m/s × 0.16 m² = 0.56 m³/s. Ensuring accurate readings across multiple points mitigates errors from uneven flow profiles.
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