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Mr. Dubey • 52.49K Points
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Q. During ultrasonic testing by the immersion method, it is frequently necessary to angulate the search unit when a discontinuity is located at an angle in order to:

(A) Avoid a large number of back reflections that could interfere with a normal test pattern
(B) Obtain a maximum response if the discontinuity is not originally oriented perpendicular to the ultrasonic beam
(C) Obtain a discontinuity indication of the same height as the indication from the flat bottomed hole in a reference block
(D) Obtain the maximum number of entry surface reflections
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