When inspecting a long bar with a longitudinal wave from one end, a series of additional echoes are seen immediately after the bottom surface reflection. these are most likely:

Related MCQs

• When comparing discontinuity echoes to equivalent flat bottom hole echoes in materials with similar impedance, surface finish and attenuation:
• When a longitudinal wave is incident upon an inclined interface and is refracted at ninety degrees, the angle of the incident longitudinal wave is called:
• What is the magnetic field strength at the surface of a 100 mm diameter bar as compared to that at the surface of a 50 mm diameter bar, each carrying 1000 amps of current?
• What is the magnetic field strength at the surface of a 25mm diameter bar as compared to that at the surface of a 50mm diameter bar, each carrying 1000 amps of current?
• What is the magnetic field strength at the surface of a 25 mm diameter bar as compared to that at the surface of a 50 mm diameter bar, each carrying 1000 amps of current?
• For a 7.6 cm (3 inches) diameter bar how much current is needed to magnetize the bar for the detection of longitudinal discontinuities:
• Which of the following describes the sound field propagating in a piece of steel bar stock which is being tested from one end with longitudinal waves?
• The longitudinal wave incident angle at which the refracted shear wave angle equals ninety degrees is called:
• The relationship between the longitudinal wave incident angle and the refracted shear wave angle is defined by:
• The longitudinal wave incident angle which results in formation of a rayleigh wave is called: