Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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The wick used in a gravity oil-feed system is typically made of __________.

Rubber
Cotton
Wool
Synthetic fiber

The correct answer is: Wool

In a gravity oil-feed system, the wick is typically made of wool. Wool is favored for its ability to absorb oil effectively and then release it consistently into the system, thanks to its natural fibrous structure. The properties of wool allow it to maintain a balance of saturation, which is essential for a gravity-feed mechanism that relies on capillary action to transport the oil from the reservoir to the burner or combustion area. Additionally, wool's durable nature ensures that it can withstand the heat and treatment from oil without deteriorating quickly. Other materials like rubber could become degraded with oil exposure, while synthetic fibers may not possess the same absorbent qualities or structural integrity as wool. Cotton, while absorbent, does not provide the same level of durability or heat resistance as wool in these applications.