Exam Question
Write short notes on:
(a) Control air dryer (4)
(b) Crankcase door (4)
(c) Auxiliary engine overspeed trip (4)
(d) Fuel oil leak off alarm (4)
Class 4 (4th Engineer)
MEKM
📅 Apr 2025
Reference Answer
### (a) Control Air Dryer (4 Marks)
**1. Purpose and Necessity:**
The primary purpose of a control air dryer is to remove water vapor from compressed air used in pneumatic control systems. This is critical for ensuring the reliability and longevity of control equipment. Atmospheric air drawn into the compressor contains moisture; as the air is compressed and subsequently cooled, this moisture will condense into liquid water.
**Consequences of Wet Control Air:**
**1. Purpose and Necessity:**
The primary purpose of a control air dryer is to remove water vapor from compressed air used in pneumatic control systems. This is critical for ensuring the reliability and longevity of control equipment. Atmospheric air drawn into the compressor contains moisture; as the air is compressed and subsequently cooled, this moisture will condense into liquid water.
**Consequences of Wet Control Air:**
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