Question 275Electricity & Electronics - 1st Asst/Chief
70% to passIn the illustrated switchboard, what is the purpose of the device labeled "AM Sel. Sw."? Illustration EL-0003
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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