UTL1

Question 1

What is the equation for wavelength

Answer 1

Wavelength = V / F

Question 2

What is the smallest consistently detectable sized discontinuity

Answer 2

1/2 wavelength

Question 3

In regards to Frequency: When the frequency is increased What is the resulting affect to the wavelength?

Answer 3

The wavelength is decreased

Question 4

In regards to Frequency: What must be done to increase sensitivity?

Answer 4

Increase the frequency; Hence you have reduced the wavelength; Thereby reducing the minimum detectable discontinuity; Therefore, increasing the sensitivity

Question 5

In regards to Frequency: What must be done to increase resolution?

Answer 5

Increase frequency will reduce the wavelength; Thereby increasing resolution.

Question 6

Regarding FPADS CRYN Define the F?

Answer 6

Frequency

Question 7

Regarding FPADS CRYN Define P?

Answer 7

Penetration

Question 8

Regarding FPADS CRYN Define A?

Answer 8

Attenuation

Question 9

Regarding FPADS CRYN Define D?

Answer 9

Divergence

Question 10

Regarding FPADS CRYN Define S?

Answer 10

Sensitivity

Question 11

Regarding FPADS CRYN Define C?

Answer 11

Crystal Thickness

Question 12

Regarding FPADS CRYN Define R?

Answer 12

Resolution

Question 13

Regarding FPADS CRYN Define Y

Answer 13

Wavelength… I know it doesn’t appear as such, however the qwerty keyboard does not have a wavelength symbol.

Question 14

Regarding FPADS CRYN Define N?

Answer 14

Near Field

Question 15

Using the memory tip WaVeForm What is the relevant equation?

Answer 15

W = V/F

Question 16

If increased Sensiivity is desired, what change is transducer Frequency should be made?

Answer 16

Increase the transducer Frequency

Question 17

Wavelength x Frequency =

Answer 17

Velocity

Question 18

When performing UTT on externally corrodes material, The best selection of couplant in regards to viscosity would be?

Answer 18

HIGH VISCOSITY A thick couplant could better fill in voids at the Tx to scan surface interface.

Question 19

When performing UTT on externally corrodes material, The best selection of couplant in regards to viscosity would be?

Answer 19

HIGH VISCOSITY A thick couplant could better fill in voids at the Tx to scan surface interface.

Question 20

Which Tx would best penetrate an 18.00 inch thick kiln roller 1 MHz 2.25 MHz 5 MHz 10 MHz

Answer 20

1 MHz Low Frequency Higher Penetration

Question 21

When calculating the Remaining Wall Thickness (RWT) after manually taking PIt Depth Gauge readings; The PDG reading should be subtracted from the Tnom or AWT? What additional step should be taken?

Answer 21

AWT Take a UTT Wall Thickness reading using a pencil probe Tx as necessary to verify Internal Corrosion

Question 22

What is the purpose of a couplant at the Tx to test surface interface?

Answer 22

To displace the AIR at the Interface thus reducing the Accoustic

Question 23

What formula is used to calculate the relationship between the incident angle and the refracted angle?

Answer 23

SNELL’S LAW

Question 24

Is the incident angle EQUAL TO The Refracted Angle OR The Reflected Angle

Answer 24

The Reflected Angle

Question 25

Between mode types (Longitudinal OR Transverse) Which mode has the higher Velocity

Answer 25

Longitudinal Wave mode has a Velocity approximately 2 X that of Transverse within a given material

Question 26

Which wave mode is Refracted from the material at the 1st Critical Angle?

Answer 26

Longitudinal Wave

Question 27

At the 1st Critical Angle what happens to the Longitudinal Wave?

Answer 27

It becomes an OD Creep wave

Question 28

At the first Critical Angle what happens to the Transverse Wave?

Answer 28

It becomes LONELY, as it is the only remaining wave mode within the material

Question 29

Beyond the 1st Critical Angle, yet before the 2nd Critical Angle, What happens to the Longitudinal Wave?

Answer 29

It is 100% Reflected away from the material at the material interface

Question 30

What happens at the 2nd Critical Angle?

Answer 30

The Transverse Wave is Refracted to the material surface and is converted into a Raleigh Wave (Surface Wave)

Question 31

What wave mode exists at the 2nd Critical Angle?

Answer 31

A Surface Wave (Raleigh)

Question 32

Within a given material: What is the Velocity of a Surface-Wave when compared to a Shear-Wave?

Answer 32

Approx. 9/10th 0.9 90%

Question 33

In regards to Tx manufacturing: What is the benefit to producing a HIGHLY DAMPENED TRANSDUCER?

Answer 33

It stops the ringing sooner Therefore resulting in a SHORTER PULSE LENGTH & INCREASED NEAR SURFACE RESOLUTION

Question 34

Regarding Transducer (Tx) manufacturing: Which crystal element THICKNESS is needed for high frequency production?

Answer 34

A THIN CUT crystal

Question 35

A Transducer crystal is cut THICK and AGAINST the grain What would be the intended use for such a crystal?

Answer 35

For the production of LOW FREQUENCY SHEARWAVES

Question 36

A Transducer crystal is cut THIN and PARALLEL to the grain What would be the intended use for such a crystal?

Answer 36

For the production of HIGH FREQUENCY L-WAVES

Question 37

What type of energy exists within the coaxial cable?

Answer 37

ELECTRICAL ENERGY

Question 38

What type of energy exists within the material being tested with UT?

Answer 38

MECHANICAL ENERGY

Question 39

What converts Electrical energy into Mechanical energy & vise-versa?

Answer 39

A PIEZOELECTRIC CRYSTAL

Question 40

At what FREQUENCY is sound considered to become ULTRASOUND

Answer 40

20,000 Hertz (Hz)

Question 41

What is defined as 1 cycle per second

Answer 41

HERTZ

Question 42

How many cycles per second are produced by a 5 MHz Tx

Answer 42

5,000,000

Question 43

What is the Frequency of a Transducer that produces 2,250,000 cycles per second

Answer 43

2.25 MHz

Question 44

Screen Range = 5.0 inch Screen graticle grid has 10 divisions What is the material thickness of the Back-Wall Echo (BWE) is at 3.0?

Answer 44

1.50" T material

Question 45

What is the equation for Snell's Law

Answer 45

SIN 1 = VEL 1 ----- ------- SIN 2 VEL 2

Question 46

What is the Refracted Angle of L-Waves at the 1st Critical Angle?

Answer 46

90\*

Question 47

Which Critical Angle is represented by 90\* Refraction of the Transverse Waves?

Answer 47

2nd Critical Angle

Question 48

How is the Beam Spread affected when Frequency is Increased?

Answer 48

Beam Spread is DECREASED when Frequency is INCREASED

Question 49

What Frequency should be selected to produce a SHORTER NEAR FIELD

Answer 49

LOW FREQUENCY

Question 50

What is a negative side affect of using high sensitivity probes?

Answer 50

Increased Attenuation

Question 51

What type of probe would be best for detecting SMALL, NEAR SURFACE DISCONTINUITIES IN THIN MATERIAL?

Answer 51

HIGH FREQUENCY DUAL ELEMENT