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Which of the following is the best method to measure the speed?(a) Mechanical tachometer(b) Electrical tachometer(c) Magnetic pickup(d) Mechanical countersI have been asked this question in a national level competition.This intriguing question originated from Measurements and Testing in section Automotive Electronics, Engine Performance Parameter & Testing of Automobile Engines of Automobile Engineering

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Right option is (C) Magnetic pickup

The BEST explanation: Magnetic pickup is the best device to measure the speed. MECHANICAL and electrical tachometers are AFFECTED by temperature VARIATION and those are not accurate.



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