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UT Exam > UT Test > Flashcards

UT Test Flashcards

1
Q

Echo of sound pressure striking transducer determines height of echo signal on display

A

amplitude

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2
Q

Amplitude of displayed signal can be controlled with what?

A

Gain control

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3
Q

Factors that impact velocity (3)

A

makeup of material, type of scan, temperature

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4
Q

Max range of human hearing and min range of ultrasound waves

A

20000, >20000

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5
Q

A reflection from an acoustic interface is what?

A

Echo

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6
Q

What happens to sound as it travels through a non-homogenous material

A

It scatters

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7
Q

What travels via displacement of molecules around a fixed point?

A

Sound wave

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8
Q

What kind of sound waves require only elasticity and which waves require both elasticity and rigidity in the test object?

A

Just elasticity - longitudinal, both - Transverse(Shear), surface, plate.

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9
Q

What type of wave has vibrations that are parallel to the direction of the wave?

A

Longitudnal

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10
Q

What is the principle that says sound bends at the interface of two materials of different velocity?

A

Refraction. This is the concept behind shear waves.

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11
Q

Crystal sources are made from which elements?

A

Barium and lead

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12
Q

What data is displayed in the horizontal and vertical axis for A-Scan, B-Scan, C Scan

A

A Scan - horizontal = time, vertical = amplitude, B Scan is cross section of the object, S Scan is top view of object.

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13
Q

Difference between Thickness gauge and Flaw Detector displays

A

Primary readout on thickness gauge is numerical followed by A Scan. Flaw detectors are the opposite.

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14
Q

The ___ of echo sound pressure striking the transducer determines the height of the echo signal on the display.

A

amplitude

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15
Q

Of what use is the detector?

A

provides various video modes for display of signals coming from the reciever?

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16
Q

What are the benefits of narrow and broad-band display?

A

Narrow provides better test sensitivity, broad provides better resolution

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17
Q

What control prevents undesirable low amplitude signals from being displayed?

A

Reject Control

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18
Q

What probe should be used for examining parts with laminations before angle beam inspection

A

Twin crystal 0 probe

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19
Q

What testing method should be used when testing for planar discontinuities?

A

Straight beam, dual crystal

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20
Q

Indication on screen representing far boundary of test object

A

back wall echo

21
Q

Snell’s law describes?

A

relationship between velocity and the refracted angle

22
Q

Which probe is used to test for lack of sidewall fusion

A

angle probe

23
Q

What search unit would have the thinnest crystal? 25 mhz or 1 mhz

A

25 mhz

24
Q

probe used to test welds for toe cracks

A

angle probe

25
Q

Speed of a sound wave is ___?

A

consistent

26
Q

Mode conversion occurs when?

A

incident angle is not normal to the interface

27
Q

The second critical angle is the angle at the point of incidence at which?

A

surface waves are produced

28
Q

Which mode of vibration produces the shortest wavelength?

A

surface wave

29
Q

Which scrren view produces a plan type view of test object

A

C-Scan

30
Q

formula for wavelength

A

velocity/frequency

31
Q

frequncy marked on a transducer indicates what?

A

operating frequency

32
Q

greek letter for wavelength is?

A

l

33
Q

_ determines the relative amount of sound energy coupled through and reflected at an interface

A

acoustic impendance

34
Q

The amplitude on an A-Scan represents what?

A

amount of reflected energy coming back to the search unit

35
Q

What are the 3 casting processes?

A

Sand, investment, die

36
Q

Dead Zone is defined as?

A

distance covered by the front surface pulse width and recovery time.

37
Q

What kind of wave is produced at the second critical angle

A

surface wave

38
Q

Why isn’t air a good transmitter of ultrasound

A

particle density is too low

39
Q

Atomic number is?

A

number of protons

40
Q

Is volumetric or planar defects considered most serious and why?

A

planar, because they are higher stress concentrators

41
Q

TIG equals

A

tungsten inert gas welding

42
Q

What type of wave is 3 wavelengths or less

A

lamb or plate

43
Q

What is Q factor

A

number of cycles for crystal vibrations to reach full amplitude

44
Q

initial pulse/dead zone is the area where__?

A

no reflection of the defect can be seen

45
Q

What is attenuation?

A

loss of energy in the far field due to composition of the test object

46
Q

what is the name of the angle when sound emerges from a second medium and the refracted angle is 90 degrees.

A

critical angle

47
Q

What is first critical angle

A

when long waves reach 90 degrees of refraction

48
Q

What happens to beam spread as frequency increases?

A

decreases

49
Q

What happens to beam spread as velocity decreases?

A

decreaes

UT Exam (1 decks)

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