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In through-transmission method, which defect does the following amplitude-time graph represent?(a) No defect(b) Small defect(c) Mediocre defect(d) Large defectI got this question in an interview.My question comes from Ultrasonic Inspection in portion Non Destructive Techniques of Casting-Forming-Welding II

Answer»

Right answer is (d) Large defect

Easiest explanation: Ultrasonic INSPECTION method further gets classified under one of the type of called through-transmission method. In this method, there are TWO PROBES, transmitter and receiver. The following GRAPH represents large defect in through-transmission method.



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