Which of the following is not a variable area flow meter ?
Correct answer: D. Magnetic flow meter
- A. Piston type meter
- B. Rotameter
- C. Orifice and tapered plug meter
- D. Magnetic flow meter
Explanation
A magnetic flow meter determines flow from the voltage induced in a conductive fluid, so it does not use a changing flow area. Rotameters and piston or tapered-plug meters operate through variable-area effects.
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