If the major dimensions of a discontinuity in a 15 cm (6in.) thick aluminum plate lie parallel to the entry surface at a depth of 76 mm (3 in.) it will be best detected by:

when setting up a distance amplitude correction curve using 3 flat bottom holes, sometimes the hole closest to the transducer gives less of a response than one or both of the other two, this could be caused by:

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:

Which of the following discontinues located 15 cm (6 in.) from the entry surface would result in the largest CRT indication if all factors except discontinuity surface condition and orientation are the same?

ultrasonic testing of material were the search unit is in direct contact with the material being tested bay be:
a. angle beam testing.
b. all answers.
C. surface wave testing.
D. straight beam testing.

most commercial ultrasonic testing is accomplished using frequencies between:
a. 15 and 100 MHz
B. 0.2 and 25 MHz
C. 1 and 100 kHz
D. 1 and 25 kHz

when performing a surface wave test, indications may result from:
a. oil on the surface
b. surface discontinuities
c. all answers
d. dirt on the surface

an ultrasonic test thing a straight beam contact search unit is being conducted through the thickness of a flat part such as a plate. this test should detect:

which component in an ultrasonic immersion system is used to adjust and maintain a known transducer angle?
a. search tube
b. manipulator
c. carriage
d. index system

the velocity of sound in a material is dependent upon the:
a. frequency of the wave
b. material properties
c. wavelength
d. vibration cycle

The indication on the cathode ray tube (CRT) with represents the far boundary of the material being tested is called:
A. thi initial pause
B. the main bang
C. the back surface reflection
D. hash

A search unit containing three or more individual transducer elements is often referred to as:
a. sandwich transducer
b. dual transducer
c. a mosaic transducer
d. none of the above

on the area amplitude ultrasonic standard test blocks the flat bottom holes in the blocks are:

what is the most common type of data display used for ultrasonic examination of welds?
A. B-scan
B. C-Scan
C. A-scan
D. X-Y plot

As the grain site increases in a material, its principal effect In ultrasonic testing is on the:
a. angle of refraction
b. velocity of sound
c. attenuation
d. acoustic impedance

which circuits modify the return signal from the receiving transducer into a form suitable for display on an oscilloscope or other output device?
a. receiver-amplifier
b. pulser
c. sweep
d. clock

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:
a. sweep line
b. initial pulse
c. marker
d. time/distance line

Search units constructed with a plastic wedge or standoff between the transducer element and the test piece are commonly used for
a. surface wave contact testing
b. angle beam contact testing
c. dual transducer straight beam contact testing
d. all answers

in immersion testing, verification that the search unit is normal to a flat entry surface is indicated by:
a. elimination of water multiples
b. maximum amplitude of the initial pulse
c. proper wavelength
d. maximum reflection from the entry surface

in ultrasonic testing, a liquid coupling medium between the crystal surface and the part surface is necessary because:

penetration of ultrasonic waves in a material is normally the function of test frequency used. which of the following frequencies would provide the greater depth of penetration?
a. 1 MHz
b. 2.25 MHz
C. 10 MHz
D. 5MHz

Which frequency will produce the shortest wavelength pulse?
a. 25 MHz
B. 1 MHz
C. 5 MHz
D. 10 MHz

if a discontinuity is located in the fresnel or near field region of a sound beam:

an ultrasonic testing technique in which the transducer element is not parallel to the test surface is called
A. contact testing
B. through-transmission testing
c. immersion testing
d. angle beam testing

The component in a conventional immersion system that spans the width of the immersion tank is called:
a. a bridge
b. search tube
c. manipulator
d. articulator

in immersion testing, the most commonly used coupling is:
a. oil
b. water
c. glycerin
d. alcohol

if the velocity of a longitudinal mode wave in a given homogenous material is 0.625 cm/ns at 13 mm )0.5 in.) below the surface, what is the velocity at 51 mm (2 in.) below the surface?

reasons for using reference/ calibration standards?

most ferrous and nonferrous welds may be ultrasonically tested using a frequency range of:
a. 1-2.25 MHz
b. 25-100 kHz
c. 3-6 MHz
d. 10-20 MHz
e. 200-500 kHz

the boundary between two different materials which are in contact with each other is called:
a. rarefactor
b. refractor
c. marker
d. interface

in immersion testing, a wetting agent is added to the water to:
a. prevent cloudiness
b. adjust the viscosity
c. help eliminate the formation of air bubbles

When a C-scan recording is used to produce a permanent record of an ultrasonic test, the information displayed is typically the discontinuities:
a. location and depth
b. depth and size
c. depth orientation and size
d. location and size (plan view)

100 000 cycles per second can be written:
a. 0.1 kHz
b. 100 kHz
c. 10 kHz
d. 100 MHz

the primary purpose of reference blocks is to:
a. Aid the operator in obtaining max back reflectors
b. obtain a common reproducible signal
c. obtain the greatest sensitivity possible from an instrument

in the transverse or hear wave, the particles:
a. oscillate at a right angle to the direction of wave propagation
b. oscillate parallel to the direction of wave propagation
c. move in a elliptical pattern

when performing a contact inspection on a curved surface, what piece of equipment can be used to improve coupling:
a. a spherically focused transducer
b. a shaped shoe
c. a cylindrically focused transducer
d. a large diameter transducer

ultrasound is generally defined as sound t frequency above the threshold of human hearing which is?
a. 20,000 Hz
b. 2 Hz
c. 20,000 MHz
d. 2 Mhz

the number of cycles per second is the definition of:
a. hertz
b. wave speed
c. none of the answers
d. frequency

Snell's Law describes the relationship between the sound velocity and:
a. the refracted angle
b. the reflected angle
c. both
d. none

the frequency marked on a transducer indicates:
a. the highest frequency produced buy the transducer
b. the range of transducers operating frequency
c. the center frequency at which the transducer operates

the measure of how a signal from a defect compared to other background reflections is called:
a. refraction
b. signal to noise ratio
c. reflection
d. acoustic impedance

in order to have a reasonable chance at detecting a discontinuity, the reflexive surface of the discontinuity music have a dimension that is at least as long as ________ wavelength
a. one-half
b. one-quarter
c. two
d. one

mode conversion occurs when a sound wave encounters an interface between material of different acoustic impedance and:
a. one of the two materials in a liquid
b. the incident angle is greater than the first critical angle
c. the incident angle is not normal to the interface

when an ultrasound wave passes through an interface between two materials at an oblique angle, and the materials have different indices of reaction, it produces:
a. reflected waves
b. refracted waves
c. both