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Ultrasonic inspection of a ceramic detects flaws by

  • A.weighing the component both before and after firing
  • B.reflecting sound waves from internal discontinuities
  • C.drawing coloured dye into surface-breaking cracks
  • D.measuring the electrical resistance across the part

Answer: B

A discontinuity reflects part of the beam, and the time of the echo gives its depth. Coupling the transducer to a hard, irregular ceramic surface is the practical difficulty of the method. Immersion testing is used where the geometry allows it.

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