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

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

A primary purpose of a reference standard is:

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

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 degrees refraction of a longitudinal sound wave is reached is called:

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

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

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

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 are the same?

The formula sin θ1/V1 = sin θ2/V2 is referred to as:

The angle of reflection of an ultrasonic beam at an aluminum-water interface is:

What kind of waves travel at a velocity slightly less than shear waves and their mode of propagation is both longitudinal and transverse with respect to the surface?

Properties of shear or transverse waves used for ultrasonic testing include:

One of the most common applications of ultrasonic tests employing shear waves is for the:

Significant errors in ultrasonic thickness measurement can occur if:

The instrument displays a plan view of the part outline and defects when using:

The incident angles at which 90 degrees refraction of longitudinal and shear waves occurs are called:

The refraction angle of longitudinal ultrasonic waves passing from water into a metallic material at angles other than normal to the interface is primarily a function of:

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

A diagram in which the entire circuit stage or sections are shown by geometric figures and the path of the signal or energy by lines and/or arrows is called a:

A hole produced during the solidification of metal due to escaping gases is called:

The factor that determines the amount of reflection at the interface of two dissimilar materials is:

A quartz crystal cut so that its major faces are parallel to the Z and Y axes and perpendicular to the X axis is called

The equation describing wavelength in terms of velocity and frequency is:

Of the piezoelectric materials listed below, the most efficient sound transmitter is:

The formula used to determine the angle of beam divergence of a quartz crystal is:

The resolving power of a transducer is directly proportional to its:

Acoustic lens elements with which of the following permit focusing the sound energy to enter cylindrical surfaces normally or along a line focus?

When using two separate transducers (one a transmitter, the other a receiver), the most efficient combination would be a:

In immersion testing, the accessory equipment to which the search cable and the transducer are attached is called a:

In general, discontinuities in wrought products tend to be oriented:

In contact testing, defects near the entry surface cannot always be detected because of:

Rayleigh waves:

. Reducing the extent of the dead zone of a transducer by using a delay tip results in:

The technique of examining an ultrasonic reflector from different directions might be used to enable the technician to:

In immersion testing, the angle formed by the ultrasound beam and a line perpendicular to the component surface:

A major limitation of using a low test frequency is: