Exam Question
(a) Describe TWO methods of tracing a superficial crack in a casting used as a engine component. (8)
(b) Explain how propagation of a crack in a machinery component can be arrested. (8)
Class 4 (4th Engineer)
MEKG
📅 Apr 2024
Reference Answer
### (a) Methods of Tracing a Superficial Crack
Two common and highly effective Non-Destructive Testing (NDT) methods used for tracing superficial cracks in engine component castings are Dye Penetrant Testing (DPT) and Magnetic Particle Inspection (MPI). These methods are chosen based on the material of the component and the suspected nature of the flaw.
#### 1. Dye Penetrant Testing (DPT)
This method is used to detect surface-breaking discontinuities in non-porous materials, regardless of whether they are ferrous or non-ferrous.
Two common and highly effective Non-Destructive Testing (NDT) methods used for tracing superficial cracks in engine component castings are Dye Penetrant Testing (DPT) and Magnetic Particle Inspection (MPI). These methods are chosen based on the material of the component and the suspected nature of the flaw.
#### 1. Dye Penetrant Testing (DPT)
This method is used to detect surface-breaking discontinuities in non-porous materials, regardless of whether they are ferrous or non-ferrous.
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