Diesel-generators #1 and #2 are operating in...

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Question 1 of 2066636eed28f7522a1c51d49f

Diesel-generators #1 and #2 are operating in parallel with each machine operating at half-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. In the absence of an automated power management system, which of the following actions should you carry out FIRST?

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Question 1 of 20

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🔍 Key Concepts

• Loss of one generator while operating in parallel and the immediate effect on the remaining generator’s load and frequency/voltage • Difference between vital and nonvital circuits on a ship’s main switchboard • Purpose of the reverse power relay and what it has already accomplished in this scenario

💭 Think About

• When one of two paralleled generators suddenly trips mechanically, what instantly happens to the load on the remaining online generator? Can it safely take that sudden load without any action from you? • Which response directly protects the ship’s power system from an immediate blackout, and which responses are more about investigation or restoration after stability is ensured? • Given that the reverse power relay has already tripped #1 off the board, what is the next operational priority: preserving power to essential services, starting additional generation, or troubleshooting the cause?

✅ Before You Answer

• Identify which onboard systems are vital loads (e.g., steering gear, navigation equipment, essential pumps) versus comforts or nonessential services. • Consider the time-critical sequence: which choice can be done fastest to prevent overloading the remaining generator and losing power to the whole ship? • Verify in your mind that the action you pick addresses the immediate electrical load balance problem before moving on to fault-finding, resetting, or starting alternative sources.

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