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Class 2 (2nd Engineer) MET 📅 Oct 2025

Exam Question

In the event of failure of the main electrical power supply on a ship, an emergency source of power must be available. State the circuits which must be fed from such a source and discuss the reasons governing the selection of such circuits. 

Exam question diagram

Reference Answer

In the event of a failure of the main electrical power supply on a ship, certain circuits must be fed from the emergency source of power to ensure the safety and operational capability of critical systems. These circuits are essential for maintaining the functionality of key equipment and systems that are essential for the safety of the vessel and its crew. The selection of these circuits is based on several factors aimed at prioritising important functions and ensuring the vessel's ability to respond to emergencies effectively.
Steering Gear Motor: The steering gear motor is essential for controlling the direction of the vessel, ensuring manoeuvrability and avoiding collisions, especially in emergency situations.
Emergency Fire Pump: The emergency fire pump is vital for supplying water to firefighting systems in case of fire onboard, helping to contain and extinguish fires to prevent them from spreading.
Emergency Air Compressor: The emergency air compressor provides compressed air for starting from a dead ship or if all the air from the main air bottle is lost. 

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