Question 275Electricity & Electronics - 1st Asst/Chief

70% to pass

In the illustrated switchboard, what is the purpose of the device labeled "AM Sel. Sw."? Illustration EL-0003

Diagram for USCG Electrical Chief: In the illustrated switchboard, what is the purpose of the device labeled "AM...

Ait allows the instantaneous difference between individual three phase legs to be displayed on the ammeter

Bit allows the instantaneous average of the three phase legs of alternator current to be displayed on the ammeter

Cit allows the instantaneous difference between the average of the three phase legs of both alternators to be compared

Dit allows the individual three phase legs of alternator current to be displayed on the ammeter by selective switching

AI Explanation

The correct answer is D) it allows the individual three phase legs of alternator current to be displayed on the ammeter by selective switching. The "AM Sel. Sw." or Ammeter Selector Switch allows the operator to select which individual phase of the three-phase alternator current is displayed on the ammeter. This allows the operator to monitor the current in each phase independently, which is important for identifying any imbalances or issues with the alternator system. The other answer choices do not accurately describe the function of this selector switch.

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