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Where are the electro-optical sensors used?

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in Automobile Engineering by (80.5k points)
Where are the electro-optical sensors used?

(a) Position and speed measurement

(b) Piston temperature measurement

(c) Cooling water flow measurement

(d) Lubricating oil flow measurement

The question was posed to me during an interview for a job.

The above asked question is from Engine Electronics in portion Automotive Electronics, Engine Performance Parameter & Testing of Automobile Engines of Automobile Engineering

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Right answer is (a) Position and speed measurement

Easiest explanation: The electro-optical sensors can be used for position and speed measurement. These devices can operate on high frequencies. Also, it can detect fast-moving objects.

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