Which of the following may be termed as a variable orifice flow-meter ?
Correct answer: A. Rotameter
- A. Rotameter
- B. Pitot tube
- C. V-notch
- D. All A., B. and C.
Explanation
A rotameter is a variable-area flowmeter: the float moves until the opening area changes enough to balance the flow forces. A Pitot tube measures velocity from pressure difference, while a V-notch is an open-channel measuring device rather than the usual variable-area meter.
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