When testing a test piece with parallel front and back surfaces, no back wall echo can be obtained. Which of the following actions might enable you to obtain a back wall echo?

Related MCQs

• When using a straight beam technique to examine a thick test piece what change(s) would you expect to see in back wall echo size as you approach the side of the test piece? (Transducer remains completely on test piece)
• Loss of the test piece back wall echo during scanning may be caused by:
• Compared to the echo returned from a smooth reflector, the echo returned from a natural flaw of the same area and orientation is:
• When variations are noticed in the front surface reflection, the test piece should be inspected for possible near surface discontinuities by:
• A soft aluminium test piece is to be penetrant tested. The piece has previously been sand blasted to remove tightly adhering soils. What additional surface preparation should be performed?
• Which of the following is the most desirable method of pre-cleaning a test piece prior to penetrant testing?
• AA display which shows the initial pulse and the front surface echo superimposed would be considered:
• AA display which shows the initial pulse and the front surface echo with a fairly wide space between the two would be considered:
• A magnetic particle testing technique in which the test piece is magnetised and magnetic particles applied after the magnetising force has been removed is called the:
• In immersion testing, the position of the search unit is often varied to transmit sound into the test part at various angles to the front surface. Such a procedure is referred to as: