Question:
Rotameter is used for measuring
Rotameter is used for measuring
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A rotameter is a variable-area flow meter. The vertical position of its float in a tapered tube is directly proportional to the volumetric flow rate (discharge) of the fluid.
Updated On: Aug 7, 2026
- Viscosity of fluids
- Velocity of fluids in pipes
- Discharge of fluids
- Density of fluids
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Measuring and controlling fluid flow rates is essential in dairy processing lines to ensure precise blending, pasteurization, and chemical dosing.
Flow meters are instruments used to measure either the local velocity of a fluid or its total volumetric flow rate (discharge).
A rotameter is a common type of variable-area flow meter.
Step 2: Detailed Explanation:
A rotameter consists of a tapered transparent glass or plastic tube mounted vertically in the piping system, with the wider end at the top.
Inside the tube is a specially designed float that can move freely up and down.
When fluid flows upward through the tube, it exerts an upward drag force on the float.
The float rises until the upward drag and buoyancy forces balance the downward force of gravity acting on the float.
As the float rises, the annular area between the float and the tapered tube wall increases, which reduces the velocity of the fluid and the drag force.
The height of the float in the tube is directly proportional to the volumetric flow rate (discharge) of the fluid.
The flow rate can be read directly from a calibrated scale on the side of the tube.
Other instruments are used to measure viscosity (viscometers), local velocity (pitot tubes), and density (hydrometers).
Therefore, the rotameter is used to measure the discharge of fluids.
Step 3: Final Answer
The rotameter is used to measure the volumetric flow rate (discharge) of fluids.
Measuring and controlling fluid flow rates is essential in dairy processing lines to ensure precise blending, pasteurization, and chemical dosing.
Flow meters are instruments used to measure either the local velocity of a fluid or its total volumetric flow rate (discharge).
A rotameter is a common type of variable-area flow meter.
Step 2: Detailed Explanation:
A rotameter consists of a tapered transparent glass or plastic tube mounted vertically in the piping system, with the wider end at the top.
Inside the tube is a specially designed float that can move freely up and down.
When fluid flows upward through the tube, it exerts an upward drag force on the float.
The float rises until the upward drag and buoyancy forces balance the downward force of gravity acting on the float.
As the float rises, the annular area between the float and the tapered tube wall increases, which reduces the velocity of the fluid and the drag force.
The height of the float in the tube is directly proportional to the volumetric flow rate (discharge) of the fluid.
The flow rate can be read directly from a calibrated scale on the side of the tube.
Other instruments are used to measure viscosity (viscometers), local velocity (pitot tubes), and density (hydrometers).
Therefore, the rotameter is used to measure the discharge of fluids.
Step 3: Final Answer
The rotameter is used to measure the volumetric flow rate (discharge) of fluids.
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