Ultrasonic-UR

Question 1

what are the two parts of a sound wave?

Answer 1

compression and rarefaction

Question 2

what is the small group of ultrasonic waves called that occurs together and not immediately preceded or followed by other waves?

Answer 2

pulse

Question 3

in ultrasonic testing, what does the wave type or mode refer to?

Answer 3

direction of particle motion

Question 4

what is the number of sound waves that pass a given point in a given time called?

Answer 4

frequency

Question 5

high-frequency sound waves do not permanently affect a test part because of their…

Answer 5

short wavelength and low energy level

Question 6

what is the relationship between wavelength, velocity, and frequency?

Answer 6

the wavelength is equal to the velocity divided by the frequency

Question 7

what characteristic of a crystal element determines ultrasonic transducer efficiency?

Answer 7

composition

Question 8

what wave mode results in particle displacement at right angles to the direction of wave propagation?

Answer 8

shear

Question 9

surface waves are introduced into the test part using an angle beam search unit which has a _______ ________ wedge?

Answer 9

steeply angled

Question 10

what is the most probable cause for not receiving a return signal during pulse-echo testing?

Answer 10

geometry of the part

Question 11

No ultrasonic reflection from a defect can be observed in the _____ ______.

Answer 11

dead zone

Question 12

due to sound wave amplitude variations, ultrasonic inspection is not recommended in the ______ ______.

Answer 12

near field

Question 13

Where does beam spread occur?

Answer 13

far field

Question 14

what determines if the incident energy from a transducer is reflected at an interface?

Answer 14

differences in acoustic impedance at the interface

Question 15

when a longitudinal sound beam is transmitted into a solid, what determines the mode of vibration?

Answer 15

incident angle of the sound beam

Question 16

When using ultrasonic inspection, where does an undesirable mode conversion occur?

Answer 16

within the test specimen

Question 17

which type of ultrasonic display has a baseline at 50 percent of full screen height and shows the full waveform with both positive and negative peaks?

Answer 17

radio frequency, non-rectified (RF)

Question 18

what is the term for the horizontal line appearing on an ultrasonic display?

Answer 18

sweep

Question 19

what fixed starting point on the ultrasonic display is usually used to start all time measurements?

Answer 19

initial pulse

Question 20

what ultrasonic control determines the amount of time or the depth of the material displayed on the cathode ray tube (CRT)?

Answer 20

sweep length or range

Question 21

on an ultrasonic flaw detector, which portion of a received signal does the gain control adjust?

Answer 21

amplitude

Question 22

what ultrasonic instrument feature is used to detect discontinuity signals within a specified zone of the sweep?

Answer 22

flaw gate

Question 23

what determines the frequency of preventive maintenance for an ultrasonic flaw detector unit?

Answer 23

severity of the environment

Question 24

what reference governs the electrical safety requirements for using ultrasonic equipment around aircraft?

Answer 24

Air Force Occupational safety and health (AFOSH) standards

Question 25

What method of ultrasonic testing uses a single transducer to transmit and receive the sound wave?

Answer 25

Pulse-echo

Question 26

Which ultrasonic method relies only on a loss or reduction of received signal to indicate a flaw?

Answer 26

through-transmission

Question 27

what type of transducer would you use to ultrasonically inspect welds?

Answer 27

an angle beam

Question 28

when inspecting welds, what would you use an ultrasonic calculator card for?

Answer 28

the location of defects

Question 29

What are some ways to confirm the presence of a suspected defect that is found ultrasonically?

Answer 29

1) with surface waves, clean the area in front of the transducer and re-inspect (2) inspect the suspected defect from another angle or with another transducer (3) re-inspect the part with another nondestructive inspection (NDI) method capable of detecting the defect

Question 30

you would consider using an area-amplitude response when you are determining discontinuity ______.

Answer 30

size

Question 31

the principle of ultrasonic thickness measurement is based on the _____ __ _____ __ ________ ___ ____.

Answer 31

speed of sound in material and time

Question 32

which ultrasonic method is most commonly used for thickenss measurement?

Answer 32

pulse-echo

Question 33

Accurate thickness measurements are possible only when the acoustic velocity in the reference standard is ___ ____ __ ___ ________ ________ __ ___ ____ ____.

Answer 33

the same as the acoustic velocity in the test part

Question 34

In the American Society for testing Materials (ASTM) block, the flat bottom hole (FBH) diameters are measure in what increments?

Answer 34

sixty-fourths of an inch

Question 35

To heck the baseline of horizontal linerarity of the cathode ray tube (CRT) sweep, you would normally use American Society for Testing Materials (ASTM) blocks with a _______ _____ ______ ________.

Answer 35

varying metal travel distance (MTD)

Question 36

Area-amplitude blocks are used to check ________ _________.

Answer 36

vertical linearity