CWB Level II Welding Inspection - Chapter ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
11 Ultrasonic Inspection exam with correct
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
answers
||\\||\\
Can shear waves operate in similar ways to longitudinal waves in
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
the water?
||\\||\\ ||\\||\\
Yes, because there are a lot of attraction between the atoms.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
No, because it's not enough force of attraction between the
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
atoms of water. ||\\||\\ ||\\||\\
Yes, they certainly can operate in similar ways.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Yes, because shear waves cause more vibration than
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
longitudinal waves. ||\\||\\
No, because it's not enough force of attraction between the
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
atoms of water. ||\\||\\ ||\\||\\
As the direction of approach of the beam is changed, the
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
amplitude of the wave reflected from a spherical pore can be ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
expected to: ||\\||\\
not vary significantly.
||\\||\\ ||\\||\\
rise to a peak only if the probe were moved in the plane of the
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
plate.
rise to a maximum then decrease.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
,not vary significantly.
||\\||\\ ||\\||\\
Which type of display gives a cross-sectional view showing the
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
length and depth of discontinuities? ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
A-scan
B-scan
P-scan
B-scan
If you are examining a groove weld in a plate from one surface
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
with an angle probe, you would examine the upper portion of
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
the weld by:||\\||\\ ||\\||\\
placing the probe on the weld reinforcement. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
moving the probe as close as possible to the weld. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
using a normal probe close to the edge of the weld.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
moving the probe away from the weld so the beam bounces off ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
the lower surface to strike the upper portion of the weld.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
none of the above. The upper portion cannot be examined.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
moving the probe away from the weld so the beam bounces off ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
the lower surface to strike the upper portion of the weld.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
When working to CSA W59, to what must the ultrasonic ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
operator be certified? ||\\||\\ ||\\||\\
CAN/CGSB-48.9712, Certification of Nondestructive Testing ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
,Personnel.
CAN/ CGSB-59.9712, Certification. ||\\||\\ ||\\||\\
a and b ||\\||\\ ||\\||\\
none of the above ||\\||\\ ||\\||\\ ||\\||\\
CAN/CGSB-48.9712, Certification of Nondestructive Testing ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Personnel.
Sound wave is a mechanical vibration. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
No, it is like gamma radiation. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Yes, it is vibration that has characteristic frequency, that is, a
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
number of vibrations per second. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
No, it is a radiation vibration. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Yes, it is like spiritual vibration. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Yes, it is vibration that has characteristic frequency, that is, a
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
number of vibrations per second. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
For imperfections interpreted as incomplete fusion, the
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
maximum acceptable length according to ASME Section VIII, Div. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
1 is:
||\\||\\ ||\\||\\
20 mm. ||\\||\\
1/3 T (where T is weld thickness). ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
neither of the above. Incomplete fusion imperfections are ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
unacceptable regardless of length. ||\\||\\ ||\\||\\ ||\\||\\
neither of the above. Incomplete fusion imperfections are ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
unacceptable regardless of length. ||\\||\\ ||\\||\\ ||\\||\\
, In UT probe of the transverse wave mode, is the angle of
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
incidence always equal to the angle of refraction? ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
The angle of incidence is always more.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
The angle of refraction is always more.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Both angles are regulated by frequency.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Yes
The angle of refraction is always more.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Distance calibration using an IIW block for a normal ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
(longitudinal mode) probe requires the probe to be placed on ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
the:
side to reflect off the back wall.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
top of the block such that the beam reflects from the 1.5 mm
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
hole.
other edge to reflect off the curved end. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
side to reflect off the back wall.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Why is good acoustic contact between the transducer and the
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
test specimen needed? Select the most correct response:
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Ultrasonic waves of the frequency used in inspection do not ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
travel far in air, so good coupling between the transducer and
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
the specimen is needed. (Section 2.4).
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Ultrasonic waves of the frequency used in inspection travel far ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
11 Ultrasonic Inspection exam with correct
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
answers
||\\||\\
Can shear waves operate in similar ways to longitudinal waves in
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
the water?
||\\||\\ ||\\||\\
Yes, because there are a lot of attraction between the atoms.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
No, because it's not enough force of attraction between the
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
atoms of water. ||\\||\\ ||\\||\\
Yes, they certainly can operate in similar ways.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Yes, because shear waves cause more vibration than
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
longitudinal waves. ||\\||\\
No, because it's not enough force of attraction between the
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
atoms of water. ||\\||\\ ||\\||\\
As the direction of approach of the beam is changed, the
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
amplitude of the wave reflected from a spherical pore can be ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
expected to: ||\\||\\
not vary significantly.
||\\||\\ ||\\||\\
rise to a peak only if the probe were moved in the plane of the
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
plate.
rise to a maximum then decrease.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
,not vary significantly.
||\\||\\ ||\\||\\
Which type of display gives a cross-sectional view showing the
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
length and depth of discontinuities? ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
A-scan
B-scan
P-scan
B-scan
If you are examining a groove weld in a plate from one surface
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
with an angle probe, you would examine the upper portion of
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
the weld by:||\\||\\ ||\\||\\
placing the probe on the weld reinforcement. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
moving the probe as close as possible to the weld. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
using a normal probe close to the edge of the weld.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
moving the probe away from the weld so the beam bounces off ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
the lower surface to strike the upper portion of the weld.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
none of the above. The upper portion cannot be examined.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
moving the probe away from the weld so the beam bounces off ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
the lower surface to strike the upper portion of the weld.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
When working to CSA W59, to what must the ultrasonic ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
operator be certified? ||\\||\\ ||\\||\\
CAN/CGSB-48.9712, Certification of Nondestructive Testing ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
,Personnel.
CAN/ CGSB-59.9712, Certification. ||\\||\\ ||\\||\\
a and b ||\\||\\ ||\\||\\
none of the above ||\\||\\ ||\\||\\ ||\\||\\
CAN/CGSB-48.9712, Certification of Nondestructive Testing ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Personnel.
Sound wave is a mechanical vibration. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
No, it is like gamma radiation. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Yes, it is vibration that has characteristic frequency, that is, a
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
number of vibrations per second. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
No, it is a radiation vibration. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Yes, it is like spiritual vibration. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Yes, it is vibration that has characteristic frequency, that is, a
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
number of vibrations per second. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
For imperfections interpreted as incomplete fusion, the
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
maximum acceptable length according to ASME Section VIII, Div. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
1 is:
||\\||\\ ||\\||\\
20 mm. ||\\||\\
1/3 T (where T is weld thickness). ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
neither of the above. Incomplete fusion imperfections are ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
unacceptable regardless of length. ||\\||\\ ||\\||\\ ||\\||\\
neither of the above. Incomplete fusion imperfections are ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
unacceptable regardless of length. ||\\||\\ ||\\||\\ ||\\||\\
, In UT probe of the transverse wave mode, is the angle of
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
incidence always equal to the angle of refraction? ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
The angle of incidence is always more.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
The angle of refraction is always more.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Both angles are regulated by frequency.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Yes
The angle of refraction is always more.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Distance calibration using an IIW block for a normal ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
(longitudinal mode) probe requires the probe to be placed on ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
the:
side to reflect off the back wall.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
top of the block such that the beam reflects from the 1.5 mm
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
hole.
other edge to reflect off the curved end. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
side to reflect off the back wall.
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Why is good acoustic contact between the transducer and the
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
test specimen needed? Select the most correct response:
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Ultrasonic waves of the frequency used in inspection do not ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
travel far in air, so good coupling between the transducer and
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
the specimen is needed. (Section 2.4).
||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
Ultrasonic waves of the frequency used in inspection travel far ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\
