After a black out onboard and once ships...

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Question 1 of 205eccefa4bacbc34ba4d483a9

After a black out onboard and once ships power has been restored, the engine room supply fans must be started manually. What characteristic of the electrical circuit for the supply fans cause this requirement?

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🔍 Key Concepts

• Difference between low voltage release and low voltage protection in motor circuits • How equipment behaves automatically after a power failure vs when it requires manual restarting • Safety concerns with ventilation fans restarting unexpectedly after a blackout

💭 Think About

• Think about what happens to a motor starter when the supply voltage suddenly disappears and then comes back: does it automatically re-energize, or does it stay off until someone starts it again? • Which wiring arrangement is specifically intended to PREVENT automatic restarting of machinery after a power failure? • Which options describe a one-time fault condition (like an overload or breaker trip), and which describe a built-in design characteristic of the control circuit?

✅ Before You Answer

• Distinguish between protection against overload current and protection against low voltage / power loss • Identify which choice refers to a control circuit design feature rather than a fault that must be cleared • Consider which arrangement is required so that fans do not automatically restart when power is restored, for personnel and fire safety reasons

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