Question 68Electricity & Electronics - Assistant Engineer

70% to pass

Diesel-generators #1 and #2 are operating in parallel at near full load capacity. Diesel-generator #1 suddenly trips out mechanically due to low lube oil pressure. The reverse power relay functions properly and trips generator #1 electrically off the board. Which of the following actions should you carry out FIRST?

AStrip the board of all nonvital circuits.
BSecure alarms, reset reverse power relay, and restart #1 engine.
CAscertain cause of the low lube oil pressure.
DStart the emergency generator.
AI Explanation

The correct answer is A) Strip the board of all nonvital circuits. When a diesel generator trips off the board due to a mechanical failure, the first priority is to protect the electrical system from potential damage. Stripping the board of all nonvital circuits helps to reduce the electrical load and prevent the remaining generator from becoming overloaded, which could lead to further system failures. This action is typically the first step in responding to a diesel generator failure in a parallel operation scenario. The other options, while important, are not the immediate first step. B) Securing alarms and restarting the tripped generator should only be done after the electrical system is stabilized. C) Ascertaining the cause of the low lube oil pressure is necessary but comes after the initial emergency response. D) Starting the emergency generator may be required, but this should be done after the main system is secured.

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