Q. The operation of a rotameter is based on

A
rotation of a turbine
B
pressure drop across a nozzle
C
pressure at a stagnation point
D
variable flow area
Solution:

The rotameter’s operation is based on the variable area principle: fluid flow raises a float in a tapered tube, increasing the area for passage of the fluid. The greater the flow, the higher the float is raised. The height of the float is directly proportional to the flowrate.

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