When calibrating a flow meter using the Timed Volumetric Method, the process should be repeated how many times and then averaged?

• A. Twice and Averaged
• B. Four Times and Averaged
• C. Three Times and Averaged
• D. Once

Answer: (C)

The Timed Volumetric Method relies on multiple trials to reduce measurement variability. Small differences in when you start or stop the timer, read the volume, or the pump’s performance can lead to slightly different results in each run. By performing three independent runs and averaging the calculated flow rates from those runs, you get a more reliable estimate than from a single trial or from just two trials. This approach balances accuracy with effort.

In practice, you measure a known volume V multiple times, record the time t for each run, compute Q = V/t for each trial, and then average the three Q values to obtain the calibrated flow rate.