Class 4 (4th Engineer) MEKG 📅 Jun 2025

Exam Question

(a) How is the tensile strength of a metal determined? What other information is obtained when a tensile test is made? (8)

(b) Name the non-destructive tests used during the manufacture and service of a diesel engine components and associated equipments. Give an example of where each test is used. (8)

Reference Answer

### (a) Determination of Tensile Strength and Other Properties (8 Marks)
#### **1. Procedure for Determining Tensile Strength**
The tensile strength of a metal is determined by a destructive test known as the **Tensile Test**, performed using a **Tensometer** or a Universal Testing Machine. The procedure is as follows:
* **Test Specimen Preparation**: A standard-sized specimen, often in a 'dumbbell' or 'dog-bone' shape, is precisely machined from the material to be tested. It has a specific gauge length ($$L_0$$) and original cross-sectional area ($$A_0$$) which are accurately measured and recorded.

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