Which of the following flow-metering instruments is an areameter ?
Correct answer: B. Rotameter
- A. Venturimeter
- B. Rotameter
- C. Pitot tube
- D. Hot wire anemometer
Explanation
A rotameter is a variable-area flowmeter: the float rises until the opening area produces a balance between flow forces and the float's effective weight. Venturimeters and Pitot tubes are differential-pressure devices rather than area meters.
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