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Airspeed measurements can be made by measuring the vortex’s _______

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Airspeed measurements can be made by measuring the vortex’s _______

(a) Strength

(b) Frequency

(c) Vorticity

(d) Direction

I have been asked this question in an online quiz.

Origin of the question is Helicopter, Optical and Hyper Sonic Air Data in section Air Data Systems, Altitude and Heading Reference of Avionics

1 Answer

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Best answer
Correct choice is (b) Frequency

Explanation: A vortex sensor measures vortices shed by fluid flow over a deliberately-inserted obstruction. The frequency of vortices is proportional to the airspeed. This method has been used in helicopters and in ground vehicle fire control systems.

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