Fresnel zone
the interference field near the face of a transducer is often referred to as the _____
Angle of Reflection
in a test where the
... [Show More] transducer is not perpendicular to the inspection surface, the angle of incidence is equal to _________
A Marker
a separate time base line imposed on the viewing screen of some ultrasonic testing instruments that permits measurement of distances is often referred to as ________
Refraction
the phenomenon whereby an ultrasonic wave changes direction when the wave crosses a boundary between materials with different velocities is called _________
Surface Waves
another name for Rayleigh Waves is _____
Coaxial Cable
the cable that connects the ultrasonic instrument to the search unit especially designed so that one conductor is centered inside another. the technical name for such cable is _______
Longitudinal Wave
another name for compressional name is_______
Crystal
the piezoelectric material in a search unit which vibrates to produce ultrasonic waves is called a _______
Frequency and Crystal Size
the amount of beam divergence from a crystal is primarily dependent on the __________
Refraction
when an ultrasonic beam passes through the interface between two dissimilar materials at an angle, a new angle of sound travel takes place in the second material due to ________
25 MHz
25 million cycles per second can also be stated as ______
A Coarse-Grained Casting
which of the following materials of the same alloy is most likely to produce the greatest amount of sound attenuation over a given distance?
Longitudinal Wave
when the motion of the particles of a medium is parallel to the direction of propagation, the wave being transmitted is called a _________
Shear Wave
when the motion of the particles of a medium is transverse to the direction of propagation, the wave being transmitted is called a ____________
Velocity
a term used in ultrasonics to express the rate at which sound waves pass through various substances is _________
Vertical Level
when a vertical indication has reached the maximum signal height which can be displayed or viewed on the CRT of an ultrasonic instrument, the indication is said to have reached its _______
Elapsed Time or Distance
in an A-scan presentation the horizontal base line represents _____
Laminar-Type Flaws with Major Dimensions Parallel to the Rolled Surface
an ultrasonic test using straight beam contact search unit is being conducted through the thickness of a flat part such as a plate. this test should detect _______
20 000 Hz
sound waves of a frequency beyond the hearing range of the human ear are referred to as ultrasonic waves or vibrations, and the term embraces all vibrational waves of frequency greater than approx. _________
The Material in which the Sound is Being Transmitted and the Mode of Vibration
the velocity of sound waves is primarily dependent on ________
Snell's Law
The formula used to calculate the angle of refraction within a material is called _________
Decrease
In a material with a given velocity when the frequency is increased the wave length will _______
Receiver-amplifier circuits
Which circuits electronically amplify return signals from the receiving transducer and often modify the signals into a form suitable for display ______
An A-scan display
What is the most common type of data display used for ultra-sonic examination of welds
Receiver-amplifier
which circuits modify the return signal from the receiving transducer into a form suitable for display on an oscilloscope or other output device
pulser
which circuit generates a burst of alternating voltage that is applied to the sending transducer
A C-scan display
A plan view display or recording of a part under examination is called
A B-scan presentation
Ultrasonic data which is presented in a form representative of the cross section of the test specimen is called
A C-Scan presentation
A type of data presentation most likely to be used with a high speed automatic scanning system is
A bridge
The component in a conventional immersion system that spans the width of the immersion tank is called
Location and size (plan View)
When a C-scan recording is used to produce a permanent record of an ultrasonic test the information displayed is typically the discontinuity's
attenuation
As the grain size increases in a material it's principal effect in ultra sonic testing is on the
Decrease it
In a straight beam pulse echo testing, a discontinuity with a rough reflecting surface perpendicular to the incident wave will have what effect on the detected signal in comparison to a smooth flat bottom hole of the same size
Angulate the search unit
What must be done to evaluate discontinuities that are oriented at an angle to the entry surface so that the sound beam will strike the plane of the discontinuity at right angles
A RF display
An A-scan CRT display which shows a signal both above and below the sweep line is called
Are reflected from a sharp edge corner
Surface (rayleigh) waves traveling on the top face of a block
Material properties
The velocity of sound in a material is dependent upon the
Decrease (be shorter)
If frequency is increased, the wave length will [Show Less]