Class 4 (4th Engineer) MET 📅 Oct 2022

Exam Question

Discuss the suitability and limitations of the following insulating materials for use on board ships and state suitable application in each case. Particular reference should be made to the influence of environment, and its effect, on deterioration in service:

(a) Pure rubber (3)

(b) Paper (3)

(d) Asbestos (3)

(e) Porcelain (2)

(f) Ebonite (2)

Reference Answer

### (a) Pure Rubber
#### Suitability
* **Electrical Properties**: Possesses good dielectric strength and high resistivity when pure and dry, making it an effective insulator for low to medium voltages.
* **Mechanical Properties**: Its primary advantage is high flexibility and elasticity, allowing it to be used for non-rigid applications like flexible cables and mats.

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