2013 Professional Knowledge Morning Question 18
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18. For a rotameter, when the water flow rate is 1 m³/h, the pressure drop between its inlet and outlet is 20 Pa. When the flow rate increases to 1.5 m³/h, what is the corresponding pressure drop in Pa? A.30 B.25 C.20 D.10 Please provide the solution.
Rotary flow meters operate under equal pressure differences, so the pressure drop is the same.
18. For a rotameter, when the water flow rate is 1 m³/h, the pressure drop between its inlet and outlet is 20 Pa. When the flow rate increases to 1.5 m³/h, what is the corresponding pressure drop in Pa? A.30 B.25 C.20 D.10 The answer is C
The pressure difference before and after the rotor is always equal to the rotor’s gravity
The pressure drop depends only on the rotor size and not on the flow rate; refer to the original textbook