Drag force on the float of a Rotameter is (where Q = flow rate of the)__________________?
Correct answer: D. Constant
- A. ∝ Q
- B. ∝ √Q
- C. ∝ Q2
- D. Constant
Explanation
At a given float position, the float's effective weight and buoyancy are fixed, so the balancing drag force is constant. The flow rate changes by moving the float to a new position where the required drag is again balanced.
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