Question 563General Subjects - Assistant Engineer

The correct answer is C) Positive displacement meter, such as a nutating disk. Positive displacement meters, like a nutating disk meter, measure the total volume of fluid that has passed through the meter. This is in contrast to other flow measurement devices that measure the instantaneous flow rate. Positive displacement meters physically track and accumulate the total volume of flow, which allows them to provide a totalized flow measurement. The other options are not well-suited for measuring totalized flow volume. Variable area meters like rotameters, constriction-type meters like venturi tubes, and velocity meters like turbines primarily measure instantaneous flow rate rather than totalized volume.