Question 551General Subjects - Assistant Engineer

70% to pass

Which of the following speed tachometers produces an analog signal proportional to the shaft speed?

AToothed-rotor Hall-effect tachometer
BDirect current tachometer
COptical tachometer
DToothed-rotor variable-reluctance tachometer
AI Explanation

The correct answer is B) Direct current tachometer. A direct current (DC) tachometer produces an analog signal that is proportional to the shaft speed. This is because the output voltage of a DC tachometer is directly related to the rotational speed of the shaft it is connected to, making it an appropriate choice for applications requiring an analog speed signal. The other options are not correct because: A) Toothed-rotor Hall-effect tachometers produce a digital signal, C) Optical tachometers use light-based sensing, and D) Toothed-rotor variable-reluctance tachometers also produce a digital signal, rather than an analog signal proportional to the shaft speed.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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