Question 72Electricity & Electronics - QMED

70% to pass

How are the number of cycles per second developed by the alternator aboard your vessel determined?

Athe speed of the engine driving the alternator

Bthe resistance applied to the field rheostat

Cthe adjustments made to the voltage regulator

Dthe synchronous speed of induction

AI Explanation

The correct answer is A) the speed of the engine driving the alternator. The number of cycles per second (frequency) developed by the alternator aboard a vessel is directly proportional to the speed of the engine driving the alternator. This is because the alternator's frequency is determined by the synchronous speed of its rotating magnetic field, which is in turn determined by the speed of the engine. The resistance applied to the field rheostat (B) and the adjustments made to the voltage regulator (C) do not directly affect the alternator's frequency. The synchronous speed of induction (D) refers to the speed of the rotating magnetic field in an induction motor, which is not relevant to the alternator's frequency.

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Official Resources

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

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