While underway at sea, a mechanical...

Question 1 / 205eccefa4bacbc34ba4d481cd

Question 1 of 205eccefa4bacbc34ba4d481cd

While underway at sea, a mechanical malfunction in one of the ship's service generators operating in parallel, requires that you must secure that generator. In order to prevent a possible overload to the remaining generator, which of the following sequential courses of action should be taken?

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🔍 Key Concepts

• Operation of generators in parallel and what happens to load sharing when one is taken off the bus • Purpose of non-vital distribution feeder breakers and why they exist • Difference between using the governor to reduce load and using a prime mover throttle trip (emergency stop)

💭 Think About

• If two generators are running in parallel and you suddenly open the breaker on one, where does that generator’s load go, and what happens to the remaining generator? • In a controlled shutdown of one generator, what should you do with non-essential loads and with the load on the failing generator before you open its breaker? • Is a throttle trip an emergency action or a fine‑control action, and should that be used before or after you remove the generator from the switchboard?

✅ Before You Answer

• Make sure the sequence includes shedding non-vital loads before the remaining generator is forced to carry the full system load • Check that the steps include reducing the load on the malfunctioning generator (via governor or similar) before opening its breaker, to avoid a sudden large load transfer • Verify that the prime mover throttle trip (emergency stop) is done only after the generator has been safely disconnected from the bus, not while it’s still carrying significant load

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Question 1 of 20

Trip the malfunctioning generator's circuit breaker and prime mover throttle trip.

Trip all non-vital distribution feeder circuit breakers, decrease the load on that generator by using the governor, trip the malfunctioning generator's circuit breaker, and trip the prime mover throttle.

Trip the malfunctioning generator's circuit breaker and distribution feeder circuit breakers.

Trip all non-vital distribution feeder circuit breakers, the malfunctioning prime mover turbine throttle trip, and the generator circuit breaker.

Question 1 / 205eccefa4bacbc34ba4d481cd

Question 1 of 205eccefa4bacbc34ba4d481cd

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Question 1 of 20

5eccefa4bacbc34ba4d481cd

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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