The wave that has multiple or varying wave velocities is:

Which of the following would be considered application(s) of ultrasonic techniques?

The only significant sound wave mode that travels through a liquid is:

The acoustic impedance of a material is used to determine the:

When angle beam contact testing a test piece, increasing the incident angle until the second critical angle is reached results in:

Acoustic energy propagates in different modes. Which of the following represents a mode?

The simple experiment where a sick in a glass of water appears disjointed at the water surface illustrates the phenomenon of:

The crystal thickness and transducer frequency are related. The thinner the crystal:

The random distribution of crystallographic direction in alloys with large crystalline structures is a factor in determining:

The length of the zone adjacent to a transducer in which functions in sound pressure occur is mostly affected by:

The difference in signals received from identical reflectors at different material distances from s transducer may be caused by:

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

In immersion testing, the near field effects of a transducer may be eliminated by:

In figure 1, assuming a uniform beam pattern, what relationship would you expect to exist between the amplitudes of the reflected laminar signals at position A ans B?

In the far field of a uniform ultrasonic beam, sound intensity is _______ the beam centerline

Which of the following may result in a narrow rod if the beam divergence results in a reflection from a side of the piece before the sound wave reaches the back surface?

Where does beam divergence occur?

A frequency increases in ultrasonic testing, the angle of beam divergence of a given diameter crystal:

As the radius of curvature of a curved lens is increased, the focal length of the lens:

When examining materials for planar flaws oriented parallel to the part surface, what testing method is most often used?

if a contact angle beam transducer produces a 45° shear wav2 in steel, the angle produced by the same transducer in an aluminum specimen would be:

Rayleigh waves are influenced most by defects located:

The ultrasonic testing technique in which finger damping is most effective in locating a discontinuity is the

Lamb waves can be used to detect:

The ratio of the velocity of sound in water compared to that of aluminum or steels approximately:

Which of the following scanning methods could be classified as an immersion type test?

In an immersion test of a piece of steel or aluminum, the water distance appears on the display as a fairly wide space between the initial pulse and front surface reflection because of:

Using the immersion method, a distance amplitude curve (DAC) for a 19mm (0.75in) diameter, 5mhz transducer shows the high point of the DAC at the B/51mm (2in) block. One day later, the high point of the DAC for the same transducer is at J/102mm (4in) block. Assuming that calibration had not changed, this would indicate that the transducer:

What law can be used to calculate the angle of refraction within a metal for both longitudinal and shear waves?

At an interface between two different materials, an impedance difference results in:

When using focused transducers, nonsymmetry in a propagated sound beam may be caused by:

Ultrasonic wheel units may be used for which of the following types of examination?

During straight beam testing, test specimens with non parallel frint and back surfaces can cause:

In the immersion technique, the distance between the face of the tranducerand the test surface (water path) is usually adjusted so that the time required to send the sound beam through the water:

In a B-Scan display, the length of a scan indication from a discontinuity is related to:

Which circuit triggers the pulse and sweep circuits in an A-scan display?

On an A-scan display, the "dead zone" refers to:

On an A-scan display, what represents the intensity of a reflected beam?

Of the following scan types, which one can be used to produce a recording of flaw areas superimposed over a plan view of the test piece?

In immersion testing in a small tank, a manually operated manipulator is used to:

In straight (normal) beam contract testing, a reduction in the back surface reflection amplitude could indicate:

A 152mm (6in) diameter rod is being inspected for centerline cracks. The A-scan presentation for one complete path through the roof is as shown in figure 2. The alarm gate should:

In an automatic scanning immersion unit, the bridge or carriage serves to:

When adjusting the flaw locating rule for a shear wave weld inspection, the zero point on the rule must coincide with the:

A special scanning device with the transducer mounted in a tire-like container filled with couplant is commonly called:

Which best describes a typical display of a crack whose major surface is perpendicular to the ultrasonic beam?

A primary purpose of a reference standard is:

Compensation for the variation in echo height related to variations in discontinuity depth in the material is known as:

Which of the following is a reference reflector that is not dependent on beam angle?

During a straight beam ultrasonic test, a discontinuity indication is detected that is small in amplitude compared to the loss in amplitude of back reflection. The orientation of this discontinuity is probably:

A discontinuity is located having an orientation such that it's long axis is parallel to the sound beam. The indicationfrom such a discontinuity will be:

Gas discontinuities are related to flat discs or other shapes parallel to the surface by:

In which zone does the amplitude of an indication from a given discontinuity diminish exponentially as the distance increases?

A smooth flat discontinuity whose major plane is not perpendicular to the direction of sound propagation may be indicated by:

Using a pulse echo technique, if the major plane of a flat discontinuity is oriented at some angle other than perpendicular to the direction of sound propagation the result may be:

As transducer diameter decreases, the beam spread:

A set of standard reference blocks with the same geometrical configuration and dimensions other than the size of the calibration reflectors, e.g., flat bottom holes, is called a set of:

The angle at which 90° refraction of a longitudinal sound wave is reached is called:

The control of voltage supplied to the vertical deflection plates of the instrument display in an A-scan UT setup is performed by the:

Attenuation is a difficult quantity to measure accurately, particularly in solid materials, at the test frequencies normally used. The overall result usually observed includes other loss mechanisms which can include:

The vertical linear range of a test instrument may be determined by obtaining ultrasonic responses from:

Large grains in a metallic test specimen usually result in:

The total energy losses occurring in all materials is called:

Delay-tip (stand off) type contact transducers are primarily used for:

Acoustical lenses are commonly used for contour correction. When scanning the inside of a pipe section by the immersion method, use a:

In figure 3, transducer A is being used to establish:

In figure 3, transducer C is being used to check:

In figure 3, transducer D is being used to check:

When the incident angle is chosen to be between the first and second critical angles, the ultrasonic wave generated within the past will be:

In figure 4, transducer B is being used to check:

The angle at which 90° refraction of shear wave mode occurs is called the:

In a water immersion test, ultrasonic energy is transmitted into steel at an incident angle of 14°. What is the angle of the refracted shear wave within the material?

If you were requested to design a plastic shoe to generate a Rayleigh wave in aluminum, what would be the incident angle of the ultrasonic energy?

Compute the wavelength of ultrasonic energy in lead at 1MHz

For aluminum and steel, the longitudinal velocity is approximately ______ the shear velocity.

Water travel distance for immersion inspections should be:

The electric circuitry that allows selection processing of only those signals relating to discontinuities that occur in specific zones of a part is called:

When conducting a contact ultrasonic test, the "hash" or irregular signals that appear in the CRT display of the area being inspected could be caused by:

In inspecting a102mm (4in) diameter threaded steel cylinder for radial cracks extending from the root of threads, it would be preferable to transmit:

In an immersion inspection of raw material, the water travel distance should be:

The angle formed by an ultrasonic wave as it enters a medium of different velocity than the one from which it came and a line drawn perpendicular to the interface between the two media is called the angle of:

The process of adjusting an instrument or device to a reference standard is referred to as:

An electron tube in which a beam of electrons from the cathode is used to reproduce an image on a display at the end of the tube is referred to as:

A grouping of a number of crystals in one transducer, with all contact surfaces in the same plane, and vibrating in phase with each other to act as a single transducer is called a:

The angle of reflection is:

The angular position of the reflecting surface of a planar discontinuity with respect to the entry surface is referred to as:

A short burst of alternating electrical energy is called:

In ultrasonic testing, the duration of the transmitted pulse is referred to as:

The phenomenon by which a wave strikes a boundary and changes direction of its propagation within the same medium is referred to as:

The change in direction of an ultrasonic beam when it passes from one medium to another whose velocity differs from that of the first medium is called:

The coated inside surface of the large end of a cathode ray tube which becomes luminous when struck by an election beam is called:

Which of the following modes of vibration exhibits the shortest wavelength at a given frequency and in a given material?

In general, shear waves are more sensitive to small discontinuities than longitudinal waves for a given frequency and in a given material because:

In general, which of the following modes of vibration would have the greatest penetrating power in a coarse-grained material if the frequency of the waves is the same?

A testing technique in which the crystal or transducer is parallel to the test surface and ultrasonic waves enter the material being tested in a direction perpendicular to the test surface is:

The distance from a given point in an ultrasonic wave to the next corresponding point is referred to as:

The speed with which ultrasonic waves travel through a material is known as it's: