ASNT Level III: Ch. 4 Ultrasonic Testing EXAM
QUESTIONS WITH SOLVED CORRECT ANSWERS.
An ultrasonic test using a straight-beam contact search unit is being conducted through
the thickness of a flat part, such as a plate. This test should detect: - CORRECT
ANSWER✅✅laminar type discontinuities with major dimensions parallel to the plane of
the rolled surface
Angle-beam testing of plate will often miss: - CORRECT ANSWER✅✅laminations that
are parallels to the from surface
Generally, the best ultrasonic testing technique for detecting discontinuities oriented
along the fusion zone in a welded plate is: - CORRECT ANSWER✅✅an angle-beam
method using shear waves
In a basic pulse-echo ultrasonic instrument, the components that produces the voltage
that activates the search unit called - CORRECT ANSWER✅✅a pulser
In area-amplitude ultrasonic standard test blocks, the flat-bottom holes in the blocks are:
- CORRECT ANSWER✅✅difference diameter, increase n 0.4mm (0
.2in) increments from the No. 1 block to the No. 8 block
In contact testing, shear waves can be induced in the test material by: - CORRECT
ANSWER✅✅using an angle-beam transducer with the transducer mounted on a plastic
wedge so that sound enters part an an angle
In general, shear waves are more sensitive to small discontinuities than longitudinal
waves for a given frequency and in a given material because: - CORRECT
ANSWER✅✅the wavelength of shear waves is shorter than the wavelength of
longitudinal waves
In immersion testing, proof that the search unit is normal (perpendicular) to a flat entry
surface is indicated by: - CORRECT ANSWER✅✅maximum reflection amplitude from
the entry surface
In immersion testing, the water distance between the search unit and the test piece: -
CORRECT ANSWER✅✅should be the same as the water distance used during
calibration
QUESTIONS WITH SOLVED CORRECT ANSWERS.
An ultrasonic test using a straight-beam contact search unit is being conducted through
the thickness of a flat part, such as a plate. This test should detect: - CORRECT
ANSWER✅✅laminar type discontinuities with major dimensions parallel to the plane of
the rolled surface
Angle-beam testing of plate will often miss: - CORRECT ANSWER✅✅laminations that
are parallels to the from surface
Generally, the best ultrasonic testing technique for detecting discontinuities oriented
along the fusion zone in a welded plate is: - CORRECT ANSWER✅✅an angle-beam
method using shear waves
In a basic pulse-echo ultrasonic instrument, the components that produces the voltage
that activates the search unit called - CORRECT ANSWER✅✅a pulser
In area-amplitude ultrasonic standard test blocks, the flat-bottom holes in the blocks are:
- CORRECT ANSWER✅✅difference diameter, increase n 0.4mm (0
.2in) increments from the No. 1 block to the No. 8 block
In contact testing, shear waves can be induced in the test material by: - CORRECT
ANSWER✅✅using an angle-beam transducer with the transducer mounted on a plastic
wedge so that sound enters part an an angle
In general, shear waves are more sensitive to small discontinuities than longitudinal
waves for a given frequency and in a given material because: - CORRECT
ANSWER✅✅the wavelength of shear waves is shorter than the wavelength of
longitudinal waves
In immersion testing, proof that the search unit is normal (perpendicular) to a flat entry
surface is indicated by: - CORRECT ANSWER✅✅maximum reflection amplitude from
the entry surface
In immersion testing, the water distance between the search unit and the test piece: -
CORRECT ANSWER✅✅should be the same as the water distance used during
calibration
