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A laser Doppler anemometer is a device used to measure

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A laser Doppler anemometer is a device used to measure
1. The turbulent velocity fluctuations in a flow
2. Shear stress at a boundary
3. Drag force on an aerofoil
4. Surface tension of a fluid
5. Wind direction
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Correct Answer - Option 1 : The turbulent velocity fluctuations in a flow

Concept:

The different types of devices used to measure different flow component of the fluids are as follows:

Device

Purpose

Strain Guage

Drag force on a body

Tensiometer

Surface tension at the interface

Laser-doppler anemometer

Turbulent velocity fluctuations in a flow
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