GATE 2023 CH – Question 24

Instrumentation and Process Control · Measurement of process variables, sensors, transducers and P&ID symbols · 1 mark · Multiple choice

Which one of the following quantities of a flowing fluid is measured using a rotameter?

Static pressure
Dynamic pressure
Volumetric flow rate
Viscosity

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Correct answer: (C) Volumetric flow rate

Explanation

A rotameter is a variable-area flow meter: a float rises in a tapered tube until the area of the annular gap passes the flow, so it measures the volumetric flow rate.