Class 4 (4th Engineer) MEKG 📅 Mar 2024

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 equipment. Give an example of where each test is used. (8)

Reference Answer

### (a) Tensile Testing of Metals (8 Marks)
#### Determination of Tensile Strength
The tensile strength of a metal is determined by a destructive procedure known as the **Tensile Test**, which is conducted using a machine called a **tensometer** or Universal Testing Machine. The process is as follows:
1. **Specimen Preparation:** A standard test piece, often referred to as a "dog-bone" specimen, is precisely machined from the parent metal. It has a specific gauge length (L₀) and original cross-sectional area (A₀).

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