Kirby's Ndi Ures Vol.3

Front 1

What produces an alternating magnetic field in eddy current testing?

Back 1

Probe

Front 2

Current that is flowing through the circuit is measured in _____

Back 2

amperes

Front 3

What do you use to detect differences between permeability variations and cracks?

Back 3

Phase detection

Front 4

Eddy current inspection can do all of the following EXCEPT?

Back 4

Detect surface cracks only

Front 5

Effective depth of penetration is the depth in the inspection article at which the magnetic field strength or intensity of the induced eddy currents is REDUCED to what percent of the value at the surface?

Back 5

5

Front 6

When a test coil is moved away from a part due to lift-off, magnetic coupling between the test coil and inspection part....

Back 6

is decreased

Front 7

What effect do surface eddy currents, the secondary field, and depth of penetration have on poor conductivity?

Back 7

weaker surface eddy currents, weaker secondary field, and greater depth of penetration

Front 8

Which mode of operation has two small sensing coils wound side-by-side in the shape of two back-to-back capital D's?

Back 8

Differential

Front 9

Which type of eddy current coil has different sensors that are directionally sensitive and provide detection of crack tips?

Back 9

Conformal Coil

Front 10

What happens when an eddy current probe coil arrangement is CLOSER to the test surface?

Back 10

Small cracks can be detected due to greater sensitivity

Front 11

eddy current instruments MUST have all these capabilities EXCEPT?

Back 11

Dependability

Front 12

eddy current instruments are designed to measure what three signal qualities?

Back 12

Amplitude, phase, and frequency

Front 13

What is used to detect disturbances in the magnetic field produced by passing an alternating current in a thin planar foil of doped yttrium iron garnet?

Back 13

Magneto-optic imaging

Front 14

How do you remove dust when cleaning an eddy current instrument?

Back 14

Use a lint-free cloth

Front 15

Paint or other nonconductive coatings should be removed when in excess of how much?

Back 15

0.010

Front 16

What is the name of the location on an impedance plane at which an eddy current instrument is USUALLY called the "good" or reference condition?

Back 16

Null point

Front 17

What type of filter REMOVES the low frequency components of the eddy current signal from the bridge?

Back 17

High-pass

Front 18

Modulation analysis is useful in separating signals of interest from other signals and relies on the analysis of what?

Back 18

Time

Front 19

While repeatedly scanning the 0.020 inch notch on an aluminum stabdard, vertical and horizontal gain MUST be increased to reach how much of full screen height during initial nulling?

Back 19

80 percent

Front 20

Inspection for cracks, measurement of conductivity, or hardness can often be complicated by what two factors?

Back 20

Surface damage and manufacturing processes

Front 21

The direction of tensile stress cracks are OFTEN analyzed by...

Back 21

engineer stress tests and historical cracking in the part

Front 22

What type of defects are usually caused by repeated cyclic loading of a structure at lower stress levels than required for visible deformation in fastener holes?

Back 22

Fatigue cracks

Front 23

Conductivity is commonly measured in units of

Back 23

mho

Front 24

Alloy effects on conductivity are caused by all of these EXCEPT?

Back 24

Cold working

Front 25

Conductivity decreases about how much in percent International Annealled Copper Standard (IACS) for 20 F temperature increase for aluminum alloys?

Back 25

One

Front 26

What is conductivity probe selection based on?

Back 26

Thickness

Front 27

What is advancement of a wave through a medium by transferring energy from one molecule to another?

Back 27

Propagation

Front 28

Ultrasonic vibrations generate by applying electrical energy to what part of the transducer?

Back 28

Piezoelectric Element

Front 29

Which wave mode is used extensively for thickness inspections, corrosion thinning, and for the detection of other defects parallel to the inspection surface?

Back 29

Longitudinal

Front 30

What is the angle between an incident longitudinal wave and a line normal to the surface called?

Back 30

Incident angle

Front 31

What changes direction of an ultrasonic beam as it passes through the interface between two materials with different acoustic velocity?

Back 31

Refraction

Front 32

Extending from the face of the transducer is an area characterized by wide variations in sound beam intensity known as...

Back 32

Near field

Front 33

During beam spread sound extends outward from the transducer and does what to intensity and distance?

Back 33

Decreases in intensity with increasing distance

Front 34

Acoustic pressure directly relates to what in the material particle vibrations caused by sound waves?

Back 34

Amplitude

Front 35

What is a fine-delay control used to compensate for transducer faceplate wear?

Back 35

Zero offset

Front 36

What REDUCES irrelevant low-level signals and noise on the waveform display?

Back 36

Reject

Front 37

What electronically compensates for material attenuation?

Back 37

Distance Amplitude Correction (DAC)

Front 38

What moves the part surface out of The Dead Zone there by improving near-surface resolution?

Back 38

Delay Lines

Front 39

Which couplant is authorized for use?

Back 39

Gel

Front 40

Which American Society of Testing an Materials (ASTM) block would you use if you have a 7075 aluminum block with a 3/64 inch diameter hole and a 3.0 inch metal travel distance?

Back 40

7075-3-0300

Front 41

What do you do with ultrasonic instruments if you find malfunctions or discrepancies NOT covered in the current technical manual or the unit does NOT meet acceptable criteria and you cannot make adjustments?

Back 41

Take the unit to Precision measurement equipment Laboratory (PMEL)

Front 42

Which data presentation displays signal amplitudes in various color schemes?

Back 42

C-scan

Front 43

Which ultrasonic technique inspects thin test parts when The Dead Zone prevents and inspection with another method?

Back 43

Through-Transmission

Front 44

Which inspection technique will you use when inspecting around Fastener holes, cylindrical components, skins and welds?

Back 44

Angle beam

Front 45

Indications on an ultrasonic wave form display determine the...

Back 45

location of a discontinuity

Front 46

Assess the outer edges of discontinuities by noting the positions of the center of the transducer when the signal amplitude from the discontinuity reduces to the value of...

Back 46

1/2 its peak

Front 47

According to TO 33B-1-2, when do you complete all ultrasonic process controls?

Back 47

Quarterly

Front 48

What are the three system process controls required for ultrasonics?

Back 48

Linearity, sensitivity, and resolution

Front 49

What is the MAXIMUM readable length of deflection determined either by an electrical or physical limit in the A-scan presentation of an ultrasonic testing element?

Back 49

Horizontal Limit

Front 50

Instruments are horizontally linear if all the values are equal within....

Back 50

3.0 percent of the full-scale width

Front 51

Which reference blocks are used for the system sensitivity check?

Back 51

ASTM Standard Reference Blocks

Front 52

Which type of frequency transducers are used for the BACK surface resolution control checks?

Back 52

2.25 MHz or above

Front 53

The angle of new and used ultrasonic transducers should be maintained within how many degrees of what is required to perform an ultrasonic inspection?

Back 53

Two

Front 54

Which process control has a mark on the side of the transducer indicating an imaginary line through the exit point of the beam that intersects the side of the wedge?

Back 54

Angle Beam Point of Incidence (POI)

Front 55

Honeycomb core can be made of all of these EXCEPT _______?

Back 55

Aluminum (3-3 states otherwise however)

Front 56

What material is made of a fibrous material embedded in a resin matrix?

Back 56

Composite Materials

Front 57

What is an adhesive that bonds fibers to each other and gives them side-to-side support?

Back 57

Matrix

Front 58

What are the principle load-carrying components in bonded or composite structures?

Back 58

Fibers

Front 59

Which fiber has high tensile and compression strength and a lack of galvanic corrosion potential, which makes it popular for repairs?

Back 59

Boron

Front 60

Which of the following is true regarding reference standards?

Back 60

Contains bonds of good quality except controlled areas of unbond fabricated

Front 61

How thick are the discs of Teflon sheets that are placed over the adhesive areas of bonded standards for Type I, II, III, and IV disbonds?

Back 61

0.006 inch

Front 62

Which inspection technique(s) are used for far side skin to core disbonds?

Back 62

Through-Transmission and Mechanical Impedance Analysis (MIA)

Front 63

What is an area within a bonded interface between two adherents in which the intended bonding area failed to take place called?

Back 63

Unbond

Front 64

What uses laser-based imaging to detect, measure, and analyze surface and subsurface irregularities in materials or structures?

Back 64

Shearography interferometry

Front 65

Shearography creates images showing the first derivative of the out-of-plane deformation of the test part surface in response to a change in load by using ______

Back 65

Cameras

Front 66

When visually assessing the integrity of bonds in honeycomb panel, what could indicate a delamination between sheets and core material?

Back 66

Buckling or dents in the face or back sheet

Front 67

Which bond testing method finds voids of 1 1/2 inch diameter or larger in metal-to-metal, composite-to-metal, or thin facing-sheet honeycomb assemblies?

Back 67

Tap testing

Front 68

All of these inspections utilize bond testing with an ultrasonic unit EXCEPT _________

Back 68

Resonance

Front 69

Which bond testing method uses a delay line for better near surface reaolution?

Back 69

Pulse-echo

Front 70

Which bond testing technique is based on absorption or energy loss in the bond line and core material?

Back 70

Ringing

Front 71

Which bond testing technique applies continuous electrical energy to the transducer PRODUCING standing waves within the material that causes it to vibrate?

Back 71

Resonance

Front 72

Which bond testing method has a probe having mechanical lift-off adjustments that sets the air gap between the coil and test surface to MINIMIZE the noise produced by probe scanning?

Back 72

Eddy sonic

Front 73

How do you clean your bondmaster when the front panel becomes soiled?

Back 73

Wipe it clean with nonabrasive towels and isopropyl alcohol

Front 74

What is the adhesive in any lap joint assembly called?

Back 74

Bond Line