Ut Lvl 1 Flashcards

Front 1

What can cause irrelevant indications on the cathode ray tube?

Back 1

Contoured surfaces

Edge Effects

Surface Conditions

All of the above

Front 2

The number of complete waves which pass a given period of time (usually one second) is referred to as the

Back 2

Frequency of a wave motion

Front 3

When testing a plate, increasing the frequency of an ultrasonic longitudinal wave will result in

Back 3

no change in its velocity

Front 4

A term used in ultrasonics to express the rate at which sound waves pass through various substances is

Back 4

velocity

Front 5

An advantage of using lithium sulfate in search units it that

Back 5

it is one of the most efficient receivers of ultrasonic energy

Front 6

the velocity of surface waves is approximately _________ the velocity of shear waves in the same material

Back 6

Nine-tenths

Front 7

The piezoeletric material in a search unit which vibrates to produce ultrasonic waves is called

Back 7

the transducer element or crystal

Front 8

Ultrasonic waves transmitted into and received from the test material in the form of repetitive bursts of acoustic

Back 8

Pulse-echo testing

Front 9

the cable that connects the ultrasonic instrument to the search unit is specifically designed so that one conductor is centered inside another. The technical name for the cable is

Back 9

Coaxial cable

Front 10

The interference field near the face of a transducer is often referred to as the

Back 10

Fresnel Zone

Front 11

A screen pattern containing a large number of low-lever indications (often referred to as "hash") could be caused by

Back 11

Coarse grained material

Front 12

What type of ultrasonic examination uses wheel type units that eliminate the use of a tank?

Back 12

Immersion testing

Front 13

The boundary between two different materials which are in contact with each other is called

Back 13

an interface

Front 14

If the velocity of a longitudinal mode wave in a given homogeneous material is .625 cm/micro sec. at 1/2 inch below the surface, what is the velocity at 2 inch below the surface?

Back 14

The same as the velocity at 1/2 inch

Front 15

The amount of beam divergence from a crystal is primarily dependent on the

Back 15

Frequency and crystal size

Front 16

What 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

Back 16

Vertical Level

Front 17

A B-scan display shows the relative

Back 17

Distance a discontinuity is from the transducer and its length in the direction of transducer travel

Front 18

An amplitude type gate is necessary for all

Back 18

Automatic Examinations

Front 19

The advantage of immersion testing includes which of the following?

Back 19

Inspection speed increased

Ability to control and direct sound beams

adaptability for automated scanning

All of the above

Front 20

The primary purpose of reference blocks is to

Back 20

Obtain a common reproducible signal

Front 21

Which circuit generates a burst of energy which is applied to the sending transducer?

Back 21

Pulser

Front 22

When performing a surface wave test, indications may result from

Back 22

Surface discontinuities

oil on the surface

dirt on the surface

Alll of the above

Front 23

Metal blocks which contain one or more drilled holes to simulate discontinuities are called

Back 23

Reference Blocks

Front 24

What is the most common type of data display used for ultrasonic testing?

Back 24

An A-scan display

Front 25

A term used to describe numerous small indications on the cathode ray tube screen resulting from test part structure, numerous small discontinuities, or both is often referred to as

Back 25

Hash

Front 26

In a test where the transducer is not perpendicular to the inspection surface, the angle of incidence is equal to

Back 26

The angle of reflection

Front 27

The product of the acoustic velocity of sound in a material and the density of the material is the factor that determines the amount of reflection or transmission of ultrasonic energy when it reaches an interface. This term is called

Back 27

Acoustic Impedance

Front 28

Sound can be focused by means of special curved adapters located in front of the transducer element. These adapters are referred to as

Back 28

Acoustic Lenses

Front 29

In immersion testing a wetting agent is added to the water to

Back 29

Help eliminate the formation of air bubbles

Front 30

Which of the following materials of the same alloy is most likely to produce the greatest amount of sound attenuation over a given distance

Back 30

A coarse grained casting

Front 31

A seperate time base line imposed on the viewing screen of some ultrasonic testing instruments that permits measurement of the distances is often referred to as

Back 31

a marker

Front 32

In contact testing the entry surface indication is sometimes referred to as

Back 32

The initial pulse

The "main band" or transmitter pulse

Both A and B

Front 33

The angle of incidence is

Back 33

Equal to the angle of reflection

Front 34

Rough entry surface conditions can result in

Back 34

A loss of echo amplitude

Increase in the width of the front surface echo

Both A and B

Front 35

Which component in an ultrasonic immersion system is used to adjust and maintain a known transducer angle?

Back 35

A manipulator

Front 36

What must be done to evaluate discontinuities that are oriented at an angle to the entry surface that the

Back 36

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