Which of the following list of basic NDT techniques are X ray types?

Question

Options

• AElectromagnetic / Thermal.
• BRadiation / Image generation.
• CUltrasonic / Optical.
• DThermal / Radiation.

• A
  4% (1)
• B
  79% (19)
• C
  4% (1)
• D
  13% (3)

Explanation

Option B is correct because X-ray NDT methods are classified under two fundamental categories: Radiation (X-rays are ionizing electromagnetic radiation used to penetrate materials) and Image generation (the technique produces radiographic images - on film or digitally - that reveal internal defects). These two descriptors together define what X-ray NDT is and how it works.

Option A (Electromagnetic / Thermal) is wrong because electromagnetic NDT refers to eddy current and magnetic particle testing, while thermal NDT uses infrared heat - neither involves X-ray radiation. Option C (Ultrasonic / Optical) is wrong because ultrasonic methods use high-frequency sound waves, and optical methods use visible light or lasers, both entirely unrelated to X-rays. Option D (Thermal / Radiation) is a trap - radiation is half right, but pairing it with thermal is incorrect since thermal imaging is a completely separate NDT category that does not involve X-rays.

Memory tip: Think "X-ray = Radiation that makes a picture" - Radiation tells you what X-rays are, Image generation tells you what they do, and that maps directly to option B.

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