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Class 4 (4th Engineer) MET 📅 Dec 2023

Exam Question

With reference to an emergency source of electrical power in cargo ships:

(a) Describe a typical power source (6)

(b) Give a typical list of essential services, which must be supplied simultaneously. (5)

(c) Explain how the emergency installation can be periodically tested. (5)

Reference Answer

### (a) Description of a Typical Emergency Power Source (6 Marks)
A typical emergency source of electrical power on a cargo ship, as mandated by SOLAS, is a self-contained generator set. This unit is designed to operate independently of the main machinery and power generation systems to ensure the availability of power for essential services during a main power failure or 'blackout'.
**1. Prime Mover:**
* **Engine Type**: A medium to high-speed diesel engine is the most common prime mover. It is a compression-ignition engine, chosen for its reliability and rapid start capability.

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