Class 4 (4th Engineer) MEKG 📅 Jul 2022

Exam Question

Sketch and describe the

(a) Fire detectors: Infra-Red Flame Detector: Pneumatic Detector and, Bimetallic Detector and their respective applications. (12)

(b) State the way the fire alarms are sounded on board and the differences between an abandon ship signal and a fire alarm signal. (4)

Reference Answer

### (a) Fire Detectors
This section describes the principle, construction, operation, and application of three common types of marine fire detectors.
#### 1. Infra-Red (IR) Flame Detector
* **Principle:** Operates by detecting the specific infrared (IR) radiation signature emitted by flames. Flames have a characteristic flicker frequency, typically in the range of 5-30 Hz (the provided context specifies 25 Hz), which distinguishes them from other IR sources like hot surfaces.

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