The GATE Grind

GATE 2022 MT – Question 16

Manufacturing Processes · Non-destructive testing · 1 mark · Multiple choice

Which one of the following Non Destructive Testing (NDT) techniques CANNOT be used to identify volume defects in the interior of a casting?

  1. Ultrasonic testing
  2. X-ray computed tomography
  3. Dye-penetrant testing
  4. Gamma ray radiography

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Show answer and explanation

Correct answer: (C) Dye-penetrant testing

Explanation

Dye penetrant enters surface-breaking discontinuities and cannot reach a sealed internal defect. Ultrasound and penetrating X/gamma radiation can inspect the interior.

Therefore **dye-penetrant testing, C**.