Class 4 (4th Engineer) MET 📅 Apr 2024

Exam Question

(a) Describe the principle of operation of EACH of the following detecting elements: (8)

(i) Bi-metal strips

(ii) Thermisters

(b) Explain, with the aid of sketches, typical applications where the devices described in (a) may be employed in high voltage electrical systems. (8)

Reference Answer

The following provides a comprehensive, surveyor-grade description of the detecting elements and their applications in high-voltage electrical systems, designed to achieve full marks in a written examination.
**(a) Describe the principle of operation of EACH of the following detecting elements:**
**(i) Bi-metal strips**
* **Concept**: A bi-metal strip operates on the fundamental principle of differential thermal expansion between two dissimilar metals. When heated, different metals expand by different amounts for the same temperature change.

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