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Ultrasonic Testing L1 > UTL1 > Flashcards

UTL1 Flashcards

1
Q

What is the equation for wavelength

A

Wavelength = V / F

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2
Q

What is the smallest consistently detectable sized discontinuity

A

1/2 wavelength

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3
Q

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

A

The wavelength is decreased

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4
Q

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

A

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

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5
Q

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

A

Increase frequency will reduce the wavelength; Thereby increasing resolution.

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6
Q

Regarding FPADS CRYN Define the F?

A

Frequency

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7
Q

Regarding FPADS CRYN Define P?

A

Penetration

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8
Q

Regarding FPADS CRYN Define A?

A

Attenuation

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9
Q

Regarding FPADS CRYN Define D?

A

Divergence

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10
Q

Regarding FPADS CRYN Define S?

A

Sensitivity

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11
Q

Regarding FPADS CRYN Define C?

A

Crystal Thickness

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12
Q

Regarding FPADS CRYN Define R?

A

Resolution

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13
Q

Regarding FPADS CRYN Define Y

A

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

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14
Q

Regarding FPADS CRYN Define N?

A

Near Field

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15
Q

Using the memory tip WaVeForm What is the relevant equation?

A

W = V/F

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16
Q

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

A

Increase the transducer Frequency

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17
Q

Wavelength x Frequency =

A

Velocity

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18
Q

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

A

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

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19
Q

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

A

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

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20
Q

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

A

1 MHz Low Frequency Higher Penetration

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21
Q

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?

A

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

22
Q

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

A

To displace the AIR at the Interface thus reducing the Accoustic

23
Q

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

A

SNELL’S LAW

24
Q

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

A

The Reflected Angle

25
Q

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

A

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

26
Q

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

A

Longitudinal Wave

27
Q

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

A

It becomes an OD Creep wave

28
Q

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

A

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

29
Q

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

A

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

30
Q

What happens at the 2nd Critical Angle?

A

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

31
Q

What wave mode exists at the 2nd Critical Angle?

A

A Surface Wave (Raleigh)

32
Q

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

A

Approx. 9/10th 0.9 90%

33
Q

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

A

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

34
Q

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

A

A THIN CUT crystal

35
Q

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

A

For the production of LOW FREQUENCY SHEARWAVES

36
Q

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

A

For the production of HIGH FREQUENCY L-WAVES

37
Q

What type of energy exists within the coaxial cable?

A

ELECTRICAL ENERGY

38
Q

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

A

MECHANICAL ENERGY

39
Q

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

A

A PIEZOELECTRIC CRYSTAL

40
Q

At what FREQUENCY is sound considered to become ULTRASOUND

A

20,000 Hertz (Hz)

41
Q

What is defined as 1 cycle per second

A

HERTZ

42
Q

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

A

5,000,000

43
Q

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

A

2.25 MHz

44
Q

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?

A

1.50” T material

45
Q

What is the equation for Snell’s Law

A

SIN 1 = VEL 1 —– ——- SIN 2 VEL 2

46
Q

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

A

90*

47
Q

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

A

2nd Critical Angle

48
Q

How is the Beam Spread affected when Frequency is Increased?

A

Beam Spread is DECREASED when Frequency is INCREASED

49
Q

What Frequency should be selected to produce a SHORTER NEAR FIELD

A

LOW FREQUENCY

50
Q

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

A

Increased Attenuation

51
Q

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

A

HIGH FREQUENCY DUAL ELEMENT

Ultrasonic Testing L1 (5 decks)

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