By what means is a diesel driven emergency...

🔍 Key Concepts

• Emergency generator requirements under SOLAS – especially separation from main power systems • Difference between synchronizing equipment (used when paralleling is allowed) and interlocking/safety devices (used to prevent paralleling) • Basic function of reverse current protection vs. mechanical/electrical interlocks

💭 Think About

• Ask yourself: Is the emergency generator supposed to ever run in parallel with the ship’s service generators, or must it always be able to supply power independently if the main system fails? • Which listed device is normally used only when two generators ARE intended to be paralleled (to match voltage, frequency, and phase)? • Which device(s) are designed to make it mechanically or electrically impossible to close the breaker in an unsafe or prohibited condition?

✅ Before You Answer

• Verify which option is a protective/safety interlock whose job is to prevent a breaker from closing under forbidden conditions, not just trip afterward. • Check which device is typically used for synchronizing generators that are meant to share load – that one is unlikely to be the correct choice here. • Confirm that the emergency generator is required to have independent starting and supply, and consider what design feature ensures its breaker cannot be accidentally paralleled with the main switchboard.

By what means is a diesel driven emergency generator prevented from being paralleled with the ship's service generators?

the reverse current relay

the synchronizing oscilloscope

an electrical interlock system

an automatic paralleling trip switch

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🔍 Key Concepts

💭 Think About

✅ Before You Answer