It is possible for a discontinuity smaller than the transducer to produce indications of fluctuating amplitude as the search unit is moved laterally if testing is being performed in the:

Related MCQs

• 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:
• Flux density is a measure of the number of magnetic flux lines perpendicular to an area of cross-section. If a discontinuity is in the plane of the unit area, the strongest magnetic article indication will be formed when the discontinuity is:
• Fluorescent penetrant indications are more visible than colour contrast penetrant indications because:
• Indications which are caused by something other than a discontinuity are called:
• AA material used between the face of a search unit and the test surface to permit or improve the transmission of ultrasonic vibrations from the search unit to the material being tested is called:
• A group of indications, some sharp and some broad and fuzzy, were found on an area of a small forging. Demagnetization and re-inspection eliminated these indications. What was the probable cause?
• Dark rounded indications with rather smooth edges appear on the radiograph of casting made in sand mould. These indications would be interpreted as:
• A magnetic particle build-up from a discontinuity is strongest when the discontinuity is oriented:
• In an A scan presentation, the amplitude of vertical indications on the screen represents the:
• In which zone does the amplitude of an indication from a given discontinuity diminish exponentially as the distance increases?