6. Gas turbine engine parts can be successfully inspected only for surface defects by: O Visual testing. Ultrasonic testing. O Radiography testing. O Eddy current testing.

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Crystalline Imperfections

The crystalline imperfections are described as the geometrical defects in the crystal due to incorrect arrangement of atoms, impurity, vacancy, and many more. It is not possible to achieve a perfect or ideal crystal, practically.