Ut I

Front 1

The indication on the instrument display that represents the far boundary of the material being tested is called:

Back 1

The back surface reflection

Front 2

In immersion testing, the position of the transducer is often varied to transmit sound into the test part at various angles to the front surface. Such a procedure is referred to as:

Back 2

Angulation

Front 3

The cable that connects the ultrasonic instrument to the transducer is specially designed so that one conductor is centered inside another. The technical name for such a cable is:

Back 3

Coaxial cable

Front 4

The process of standardizing an instrument or device by using a reference a standard is called:

Back 4

Calibration

Front 5

Another name for a compressional wave is:

Back 5

Longitudinal wave

Front 6

Another name for a rayleigh wave is:

Back 6

Surface wave

Front 7

A material used between the face of a transducer and the test surface to permit or improve the transmission of ultrasonic vibrations from the transducer to the material being tested is called:

Back 7

Couplant

Front 8

The piezoelectric material in a transducer that vibrates to produce ultrasonic waves is called a:

Back 8

Crystal

Front 9

Ultrasonic testing of material where the probe is in direct contact with the material being tested may be:

Back 9

All of the following:

Straight beam testing; surface wave testing; angle beam testing

Front 10

The reference holes in standard aluminum area-amplitude ultrasonic test blocks contain...

Back 10

Flat-bottomed holes

Front 11

The gradual loss of sonic energy as the ultrasonic vibrations travel through the material is referred to as...

Back 11

Attenuation

Front 12

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 12

Hash

Front 13

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

Back 13

No change in velocity

Front 14

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

Back 14

Pulse-echo testing

Front 15

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

Back 15

Reference blocks

Front 16

If the major dimensions of a discontinuity in a 6” thick aluminum plate lie parallel to the entry surface at a depth of 3”, it will be best detected by:

Back 16

A straight beam test

Front 17

The existence of a discontinuity will not produce it’s specific indication on the CRT screen when using the:

Back 17

Immersion test method

Front 18

The depth of a discontinuity cannot be determined when using:

Back 18

Through transmission testing method

Front 19

When inspecting course-grained material, which of the following frequencies will generate a sound wave that will be most easily scattered by the grain structure?

Back 19

10 MHZ

Front 20

Which of the following search units would contain the thickest crystal?

Back 20

1 megahertz search unit

Front 21

When performing a surface wave test, indications may result from:

Back 21

Surface discontinuities, oil or dirt on the surface.

Front 22

When performing a surface wave test, indications may result from:

Back 22

Surface discontinuities, oil or dirt on the surface.

Front 23

Search units constructed with a plastic wedge or standoff between the transducer element and the test piece are commonly used for:

Back 23

Dual transducer straight beam contact testing, angle beam contact testing

Front 24

When performing a surface wave test, indications may result from:

Back 24

Surface discontinuities, oil or dirt on the surface.

Front 25

Search units constructed with a plastic wedge or standoff between the transducer element and the test piece are commonly used for:

Back 25

Dual transducer straight beam contact testing, angle beam contact testing

Front 26

A search unit containing three or more individual transducer elements is often referred to as:

Back 26

A mosaic transducer

Front 27

When performing a surface wave test, indications may result from:

Back 27

Surface discontinuities, oil or dirt on the surface.

Front 28

Search units constructed with a plastic wedge or standoff between the transducer element and the test piece are commonly used for:

Back 28

Dual transducer straight beam contact testing, angle beam contact testing

Front 29

A search unit containing three or more individual transducer elements is often referred to as:

Back 29

A mosaic transducer

Front 30

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

Back 30

Acoustic lenses

Front 31

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:

Back 31

A marker

Front 32

A term used to describe the ability of an ultrasonic testing system to distinguish between the entry surface response and the response of discontinuities near the entry surface is:

Back 32

Resolution

Front 33

The phenomenon whereby an ultrasonic wave changes direction when the wave changes direction when the wave crosses a boundary between materials with different velocities is called:

Back 33

Refraction

Front 34

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

Back 34

The angle of reflection