M

Mr. Dubey • 52.30K Points
Coach 

Q. Loss of the test piece back wall echo during scanning may be caused by:

(A) An abnormally homogeneous material structure
(B) A smooth entry surface on the test piece
(C) A discontinuity which is not parallel to the entry surface
(D) An opposite surface which is parallel to the entry surface
Correct : Option (C)

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