Question

An example of variable area device for measuring flow is:

• A. Flow nozzle
• B. Orifice meter
• C. Venturi meter
• D. Rotameter

Hint:

Rotameters are commonly used for low-flow measurement applications, and they provide a simple, visual indication of flow rate.

Answer 1

The Correct Option is D

A rotameter is a type of variable area flow meter, where the flow area varies as the fluid flows through the device. This variation in the area results in a change in the position of a float within a tapered tube, which is used to measure the flow rate.
- Flow nozzle, Orifice meter, and Venturi meter are all flow meters, but they do not use the principle of variable area to measure the flow rate. These devices typically measure pressure changes across a restriction to calculate flow rate.
Therefore, the correct answer is Rotameter.