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ASNT > basic asnt review 2nd > Flashcards

basic asnt review 2nd Flashcards

1
Q

the most common frequency range of acoustic emission testing is

A

100-300 KHZ

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2
Q

Types of Discontinuity that are readily detectable by acoustic emission testing are

A

leak, plastic deformation, growing cracks

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3
Q

In acoustic emission testing, the total energy loss of a propagating wave is called

A

attenuation

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4
Q

the Kaiser effect refers to

A

the behavior where emission will not occur until the previous load is exceeded

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5
Q

The felicity effect is useful in evaluating

A

fiber reinforced plastic components

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6
Q

The Kaiser effect is useful in distinguishing

A

mechanical noise from growing discontinues

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7
Q

The terms counts refers to

A

the number of time a signal crosses a preset threshold

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8
Q

The acoustic emission signal amplitude is related to

A

the intensity of the source

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9
Q

In acoustic emission testing, threshold settings are determined by

A

the background noise level

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10
Q

In acoustic emission testing , background noise can be reduced by

A

electronic filtering

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11
Q

Eddy currents are circulating electrical currents induced in conductive materials by

A

Alternating magnetic field

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12
Q

The method used to generate eddy currents in the test specimen by means of a coil most closely compared with the action of a

A

Transformer

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13
Q

Eddy current testing relies on the principle of

A

Electromagnetic induction

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14
Q

When the electrical current in an eddy current coil reverses direction the

A

Direction of the eddy currents in the part also reverses

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15
Q

In order to generate measurable eddy currents in the test specimen, The specimen must be

A

An electrical conductor

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16
Q

The magnetic field generated by the eddy currents induced in the test specimen

A

Opposes the magnetic field that induced the eddy currents

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17
Q

In eddy current testing, IACS recognized abbreviation for

A

International annealed copper standard

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18
Q

In Eddy current testing, the specimen is coupled to the test coil by

A

The coils electromagnetic fields

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19
Q

The penetration of eddy currents in the conductive material is decreased when the

A

Test frequency, Conductivity of the specimen, or the permeability of the specimen is increased

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20
Q

At a fixed test frequency, in which of the following materials will the eddy current penetration be greatest

A

Lead (7% IACS conductivity)

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21
Q

A term used to describe the effect of observed due to a change in the coupling between a test specimen and a flat probe coil when the distance of separation between them is varied is

A

Lift off

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22
Q

When testing with eddy currents, discontinuity will be most easily detected when the eddy currents are

A

Perpendicular to the major plane of the discontinuity

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23
Q

Which of the following discontinuities is easiest to detect with eddy current test (subsurface crack lying parallel, discontinuity in the center of a bar stock, radial crack extended to the surface of a 2” bar, subsurface radial crack, a surface crack parallel to eddy currents)

A

A Radial crack that extends to the outer surface of a 51 mm or 2 inch diameter bar

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24
Q

The term used to define the timing relationship involved in alternating current signals is

A

Phase

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25
Q

The impedance of the test soil can be represented by the vector some of

A

Inductive Reactance And resistance

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26
Q

Disadvantages of using a surface probe coil for the eddy current inspection of small Diameter tubing include

A

Slow inherent speed and mechanical problems

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27
Q

In eddy current testing, the term to fill factor applies to

A

An encircling coil

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28
Q

in Eddy current, Which of the following materials would be most likely used as a mounting material for a probe coil (Aluminum, plastic, copper, non magnetic steel )

A

Plastic

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29
Q

Which of the following is not a commonly used eddy current testing readout mechanism (Signal generator, meter, cathode ray tube, strip chart recorder )

A

Signal generator

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30
Q

Referenced standard used for eddy current testing ( holes and notches, natural discontinues, must be free of discontinuities)

A

Are not typically described in any of the above

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31
Q

In eddy current testing name some of the conditions that are important in selecting specimens as use for reference standard

A

Specimen should be the same size and shape specimens should be of the same material and same heat treat surface finish of the specimen should be the same, that if the material is aluminum the surface should be Anodized

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32
Q

Which of the following conditions would be the most difficult to detect when eddy current testing a rod using an encircling coil (short crack that is 10% of the diameter, 5% change in diameter, 10% change in conductivity, a small inclusion in the center)

A

A small inclusion in the center of the rod

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33
Q

The thickness of non conductive coatings on the conductive base can be most simply measured by

A

Observing the lift off effect caused by the Coating

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34
Q

Some of the products commonly eddy current tested using encircling coils are

A

rods, tubes, wires

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35
Q

it is often possible to sort various alloys of a non magnetic metal by means of an eddy current test when

A

There is a unique range of conductivity values for each alloy

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36
Q

When eddy current testing tubing with a system that includes a frequency discriminating circuit, which of the following variables would be classified as a high frequency variable

A

Small discontinuities

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37
Q

Which of the following was not a candidate for testing by the eddy current method (3” thick plate, tube with surface cracks, rod with laps and seams, tube with varying diameters)

A

A 4 inch thick Plate to be tested for discontinuities Throughout the plate

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38
Q

which systems or components are candidates for leak testing

A

Piping and pressure vessels and, refrigeration piping, vacuum chambers

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39
Q

A helium mass spectrometer is used in which of the following NDT methods

A

Leak testing

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40
Q

Which of the following is a technique of a leak testing (bubble detection, pressure change measurements, halogen sniffing)

A

Halogen sniffing

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41
Q

Potentially the most sensitive leak testing technique is the (mass spectrometer, bubble test, pressure change, liquid penetrant)

A

Mass spectrometer test

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42
Q

Establishing differential pressure between a test object and environments is an in sensual element in which of the following methods (X-ray, neutron, leak testing, gamma radiography

A

Leak testing

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43
Q

Which of the following best describes the type of leak test used when the interior of the test object is Evacuated And a tracer gas is applied to the exterior )static leak, helium test, dynamic leak, halogen leak, sniffer leak)

A

Dynamic leak test

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44
Q

Assuming no significant leakage, if the temperature increased during a pressure drop leak test, the pressure in the system under test would

A

Increase

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45
Q

If the sensitivity of the halogen leak detector is constant throughout a test, which of the following is true upon completion of the test (no leaks of certain size have gone undetected, total leak rate is less than a certain amount, the instrument and test procedure were capable of leak detection of a certain size)

A

The instrument and test procedure were capable of detecting leakage of a certain size during the test

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46
Q

All leak detection methods are dependent upon

A

Gas or fluid flow

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47
Q

In an evacuated system, sensitivity of a pressure change leak test is dependent not only on the pressure change observed, but also on the degree of out gassing. Out gassing is best defined as

A

The release of gas from materials in a vacuum

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48
Q

The tendency of a liquid penetrant to enter a discontinuity is primarily related to

A

Capillary forces

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49
Q

Liquid penetrant testing is a nondestructive test that can be used for

A

Locating discontinuities open to the surface

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50
Q

Which of the following is not a characteristic that applies the liquid penetrant testing (method can be used for on-site testing of large parts, method can be made more or less sensitive by using different penetrant material, find shallow surface discontinuities, method can accurately measure the depth of a crack or discontinuity)

A

This method can accurately measure the depth of a crack or discontinuity is not true

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51
Q

The property of the dye used in penetrant materials to emit light of a range of wavelength different from the wavelength of light that excites the emission is called

A

Fluorescence

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52
Q

When using a fluorescence post emulsifier penetrant, the length of time the emulsifier is allowed to remain on the part is critical for detecting shallow discontinuities. The optimum length of time should be

A

Determine by experimentation

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53
Q

A red penetrant indication against white background is most likely to be seen when

A

Visible by penetrant are used

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54
Q

The most widely accepted method for removing excessive water washable penetrant from the surface of the test specimen is by

A

Using a water spray rinse

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55
Q

Which of the following penetrant systems is generally considered the least sensitive (

A

Water washable with visible Die

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56
Q

There are several ways to remove excess solvent removable visible Dye penetrant. Which of the methods listed is generally regarded as the most suitable for giving accurate test results (squirt solvent with 10psi pressure, wiping with solvent soaked cloth the wipe with dry cloth, wipe with solvent damp cloth the wipe with dry cloth, wipe with dry, wipe with solvent damp cloth, then wipe with dry cloth)

A

Wiping with dry wipe , then wiping with solvent dampened cloth, and finally wiping with dry cloth

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57
Q

A problem with retesting a specimen that has been previously tested using liquid penetrant is that

A

penetrant residue left in discontinuities may not readily dissolve and the retest may be misleading

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58
Q

A commonly used method of checking the overall performance of the penetrant material system is to (determine the viscosity of the penetrant, measure the wetability of the penetrant, compare two sections of artificial crack specimens)

A

Compare two sections of artificially cracked specimens

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59
Q

The function of emulsifier in the post Emulsified penetrant process is to

A

React with the surface penetrant to make the penetrant water washable

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60
Q

Which of the following statements does not apply to developers use during penetrant testing developers are normally highly fluorescent, developers can furnish contrasting background, developers absorb or blot remaining penetrants after excess is removed)

A

Developers are normally highly fluorescent

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61
Q

The penetrant indication for a cold shut on the surface of the casting will normally be

A

A smooth continuous line

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62
Q

The penetrant indication for a crack type of discontinuity will generally appear as

A

A continuous line, either straight or jagged

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63
Q

In a penetrant test, scattered round indications on the surface of the part could be indicative of

A

Porosity

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64
Q

Which of the following are typical non relevant indications found in penetrant testing indications due to geometry or part design, nonmagnetic indications, multiple indications, non linear indications, indication on low stressed areas)

A

Indications due to part geometry or part design

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65
Q

Which of the statements below best states the results of sand blasting for cleaning surfaces to be penetrant tested (discontinuities may be closed, oil contaminates might be sealed in, the sand may be forced into the discontinuity, the operation may introduce into the part)

A

Discontinuities will be closed

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66
Q

The penetrant indication of a forging lap will normally be

A

A thin continuous line

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67
Q

Aluminum and alloyed test specimens that have been tested by the liquid penetrant method should be thoroughly cleaned after testing because

A

The Alkalines in wet developers and most emulsifiers could cause surface pitting , particularly in moist atmospheres

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68
Q

Liquid penetrants may be used for leak detection

A

If services are clean and both sides are accessible, penetrant is a diluted form during a hydro test, effectively by using fluorescent tracers

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69
Q

Which of the following is the discontinuity that might be found in rolled bar stock with liquid penetrant

A

Cracks or seams

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70
Q

anodized surfaces are usually considered poor candidates for high sensitivity liquid penetrant examination because the anodizing process produces a conversion layer that

A

Has a multitude of extremely small pores

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71
Q

Which of the following penetrant methods does not normally require a source of electricity to properly conduct a test (water washable fluorescent, post emulsified fluorescent, visible dye)

A

Visible dye penetrants

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72
Q

Which of the following statements of is true concerning penetrant testing of welds with rough surfaces (Post emulsified offers advantages over water washable, weld Surfaces must be ground flush, solvent removal process the developer would be an Aqueous suspension, Welds with rough surfaces cannot be tested

A

none are true

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73
Q

Which of the following materials cannot be tested by magnetic particle techniques (High alloy steel, tool steels, Copper alloys, ferritic stainless steel

A

Copper alloys

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74
Q

Up materials that are strongly attracted to a magnet are called

A

Ferro magnetic

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75
Q

Magnetic lines of force are orientated in which direction in relation to the direction of the magnetizing current

A

At right angles

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76
Q

Magnetizing flux is a term that relates to

A

The lines of force associated with a magnetic field

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77
Q

Subjecting a part to a magnetic field that is constantly reversing in polarity and it gradually diminishing in strength accomplishes what

A

The part is demagnetized

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78
Q

Circular magnetization is useful in the detection of

A

longitudinal cracks

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79
Q

In which magnetizing method is the current pass directly through the part, thereby setting up a magnetic field at right angles to the current flow (longitudinal magnetization, core oil magnetization, central conductor magnetization

A

None of these

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80
Q

Which of the following is a major disadvantage of using the prod method

A

The inspection service may be arc burned

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81
Q

Inspecting a part by applying the magnetic particle suspension while the current is flowing is called the

A

Continuous method

82
Q

How is the inside diameter of the cylinder best magnetized

A

With a central conductor placed between contact heads

83
Q

The amount of amperage used for magnetic particle inspection using the prod method is based on the

A

Thickness of the party and the distance between the prods

84
Q

Demagnetization is of a part is usually not necessary if the part is

A

To be Hardened by heat treatment after inspection

85
Q

Which of the following is an advantage of the dry method over the wet method (more sensitive for detecting find surface cracks, more capable of providing full service coverage on your regularly shaped parts of, it is easier to use for field inspection with portable equipment, faster when testing small parts

A

Easier to use for field inspection with portable equipment

86
Q

Fluorescent magnetic particles are used in preference to visible magnetic particles

A

To increase the speed and reliability of detecting very small discontinuities

87
Q

The most versatile type of magnetic particle equipment is (portable equipment, stationary horizontal machine, mobile power unit, automatic machine, field kit

A

Stationery horizontal machine

88
Q

Magnetic particle inspection methods are recognized as superior to liquid penetrant techniques when the

A

Parts are painted

89
Q

When using direct current, an indication is detected. What is the next logical step to determine if the indication results from a surface or subsurface condition

A

RE inspect using alternating current

90
Q

A requirement to use magnetic particle testing on a part should also include

A

The procedure to be used an acceptance criteria

91
Q

The statement that magnetic particle testing can be applied to plated and painted parts

A

May be true of flux densities are increased to compensate for the coating thickness

92
Q

The best type of magnetizing current for inspection of fatigue cracks is

A

Alternating current

93
Q

A star shaped indication was seen on the cover pass of the weld. What type of discontinuity was indicated

A

A crater crack

94
Q

For maximum sensitivity in magnetic particle inspection of rough welds

A

The well bead should be ground flush with the plate surfaces

95
Q

The highest intensity sources of thermal neutrons are (accelerators, nuclear reactors, cf-252 isotopes )

A

nuclear reactors

96
Q

neutrons for fast and neutron radiography are obtainable from (Accelerators, radioactive sources, reactors)

A

All of these

97
Q

A radioactive source to be used for neutron radiography is

A

cf-252

98
Q

The energy of the neutron is expressed in which of the following units of measurement (Curries, roentgens, half life , electron volts)

A

Electron volts

99
Q

A normally desirable feature of a thermal neutron beam for neutron radiography is

A

Low gamma radiation intensity and relatively low fast neutron intensity

100
Q

Material that slows down neutrons is called

A

A moderator

101
Q

The primary radiation mechanism for darkening X-ray film when the direct a neutron radiography processes used with gadolinium screens is

A

Electrons

102
Q

Neutron radiography using the transfer method requires that the imaging screen

A

Become radioactive

103
Q

Which of the following neutron radiography converter foils cannot be used for transfer or indirect radiography (Dysprosium, indium, gold, gadolinium)

A

gadolinium

104
Q

But the most suitable film for producing neutron Radiographs are

A

Industrial X-ray film

105
Q

materials that are exposed a thermal neutron beams

A

May be radioactive after exposure to neutrons has ceased

106
Q

Lead is a good or poor neutron absorber

A

A relatively poor neutron absorber

107
Q

if 0.08 inches of plastic attenuates a thermal neutron beam by a factor of two than 0.8 inches will attenuate it by approximately a factor of

A

1000

108
Q

Materials in common usage for moderation a fast neutrons sources include

A

Water, plastic, paraffin and graphite

109
Q

If the main reason for using neutron radiography in place of x-radiography is

A

The ability to image objects and materials not possible with x-rays

110
Q

A photographic record produced by the passage of neutrons through a specimen onto a film is called

A

A radiograph

111
Q

Many of the absorption differences between neutrons and X-rays indicate that the two techniques

A

Complement each other

112
Q

The penetrating ability of a thermal neutron beam is governed by

A

Attenuating characteristics of the material being penetrated

113
Q

The transfer exposure method is used because

A

It is not influenced by gamma radiation in the primary beam

114
Q

Higher resolution can be achieved in direct a neutron radiography by

A

Increasing the L/D ratio of the culmination system

115
Q

The primary advantage of using a Cf-252 source for neutron radiography is its

A

Portability

116
Q

Quality of the results from a neutron radiographic exposure is best determined by

A

Image quality indicators

117
Q

The radiographic image of flaws in the imaging screens can be separated from actual flaws any part being radio graphed by

A

Comparing a neutron radio graph of the part to a blank neutron radio graph of the same screen with no parts

118
Q

For inspection of radioactive objects or those that emit gamma radiation when bombarded with neutrons, a preferable detection technique is the

A

Transfer technique

119
Q

Neutron radiography is an excellent tool for determining

A

If the integrity of thin plastic material within a Steel Housing

120
Q

The neutron radiography extends radiographic capability for detecting cracks and small cylinders of

A

Plutonium

121
Q

Which of the following is not a preferred application of neutron radiography

A

Detecting the presence of a lead rupture diaphragm in a small aluminum safety valve assembly

122
Q

The penetrating ability of and X-ray beam is governed by

A

Kilovoltage or wavelength

123
Q

Two X-ray Machines operating at the same nominal Kilovoltage and milli amperage settings

A

May give not only different intensities but also different energies of radiation

124
Q

Which of the following X-ray generators would produce the narrowest cone of x radiation (10 MeV,15 MeV, 25 MeV, 1 MeV,Co-60)

A

1 MeV

125
Q

Short wavelength electromagnetic radiation produced during the disintegration of nuclei of radioactive substances is called

A

Backscatter radiation

126
Q

Almost all gamma radiography is performed with

A

Tm-170

127
Q

The energy of gamma rays is expressed by which of the following units of measurement

A

Curie

128
Q

Of the following, the source providing the most penetrating radiation is the (Cobalt 60, 15 MeV BetaTron, electrons from IR - 192, 220 KVP X-ray tube )

A

220 KVP X-ray tube

129
Q

Common sources of Neutrons for neutron radiography are

A

BetaTron

130
Q

The difference between densities of two areas of a radiograph is called

A

Film contrast

131
Q

The fact that gases, when bombarded by radiation, ionized and become electrical conductors make some useful and

A

Masks

132
Q

the reason exposure time must be increased by a factor of four when the source to film distance is doubled is that the

A

Intensity of radiation is inversely proportional to the square of the distance from the source to the film

133
Q

The most important factor in X-ray Absorption of the specimen is

A

The atomic number of the material

134
Q

Which of the following is the probable early effect of the 25 REM radiation dose of to the whole body

A

Blood changes but no serious injury

135
Q

Exposure to small doses of x-rays or gamma rays

A

Has a cumulative affect that must be considered When monitoring

136
Q

Which of the following technique variables is most commonly used to adjust to object contrast (Source to film distance, milliamperage, kilo voltage, focal spot size)

A

All of these

137
Q

A basic difference between a radio graph in a fluoroscopic image is that

A

The fluoroscopic image is positive whereas the radiographic image is a negative

138
Q

Thin sheets of lead foil in intimate contact with x-ray film during exposure increase film density because they

A

emit electrons when Exposed to x and gamma radiation, which helps to darken the film

139
Q

When viewing a radiograph, an image of the back of the cassette superimposed on the image of the specimen is noted. This is most likely due to

A

Backscatter radiation

140
Q

A penetrometer is used to measure the

A

Quality of the radiographic technique

141
Q

In film radiography, penetrometer are usually placed

A

On the source side of the test object

142
Q

Had voltages above 400 KV, the use of lead to provide protection may presents serious problems, which of the following materials would most likely be used as a substitute (Aluminum, concrete, steel, boron, polyethylene)

A

Concrete

143
Q

The distinctive characteristic of high voltage radiography is that

A

It is applicable to comparatively thick or highly absorbing specimens

144
Q

Given the radiographic equivalency factors of 1.4 for a Inconel and 1. for 304 stainless, what is the approximate equivalent thickness of Inconel to produce the same exposure as a 0.15 inch thickness of 304 stainless

A

.11 inches (.15/1.4)

145
Q

Upon completing and X-ray exposure and turning the equipment off, personnel

A

May enter the exposure area without fear of radiation exposure

146
Q

The fact that each solid crystalline substance of produces its own characteristic X-ray pattern is the basis for

A

X-ray diffraction testing

147
Q

When inspecting a light metal casing by fluoroscopy, which of the following discontinuities would most likely be detected

A

Shrinkage

148
Q

For testing a 1 inch steel plate 12 inches square for laminar discontinuities, which of the following would be most effective

A

An ultrasonic device

149
Q

a critical weld was made with a double V groove. Which technique would provide coverage with the greatest probability for detecting the most areas discontinuity

A

Two exposures aligned with the V groove plus and +-30 deg off of perpendicular

150
Q

A fuse assembly is Being Radiographed so that measurements can be made on the film to determine A minimum internal clearance dimension , what should be factored into the dimension taken from the film

A

Projection magnification, unsharpness factors, precision of the x-ray beam alignment

151
Q

Small electronic components are to be radiograph inspected To reveal Copper wires of 0.008 inches diameter. What would be the most effective technique

A

A plastic block with the radiographic thickness the equivalent of the test object, containing copper wires ranging from 0.005 inches to .015 inch diameter

152
Q

ultrasonic Waves propagate through test materials in the form of

A

Mechanical vibrations

153
Q

when an Ultrasonic beam passes through the interface of two dissimilar materials at an angle, a new angle of sound travel takes place in the second material due to

A

Refraction

154
Q

A gradual loss of energy as ultrasonic vibrations travel through material is referred to as

A

Attenuation

155
Q

Ultrasonic velocities are different for different materials. These differences are primarily caused by differences in the materials

A

Elasticity and density

156
Q

The ultrasonic energy For immersion testing is transmitted to the test object as a compressional wave because

A

Liquids will only sustain compressional waves

157
Q

When inspecting course grained materials, which of the following frequencies will generate a sound wave that will be most easily scattered by the grain structure (1.0 MHz, 2.25 MHz, 5 MHz, 10 MHz)

A

10 MHz

158
Q

In general, shear waves are more sensitive to small discontinuities than longitudinal waves for a given frequency and in a given material because

A

The wavelength of shear waves is shorter than the wavelength of longitudinal waves

159
Q

The ability of transducers to detect echoes from small discontinuities is the definition for

A

Sensitivity

160
Q

Which of the following will create a resonance condition in a specimen

A

Continuous longitudinal waves

161
Q

The display on most basic pulse echo ultrasonic instruments consists of

A

An A scanned presentation

162
Q

In a basic pulse echo, the component that produces the voltage that activates the search unit is called

A

The pulsar

163
Q

The primary purpose of reference blocks is to

A

Obtain a common reproducible reference standard

164
Q

The general use of distance amplitude calibration is to compensate for

A

Attenuation, distance and beam spread

165
Q

In area amplitude ultrasonic standard of test blocks, the flat bottom of holes in the blocks are

A

Different in diameter, increasing in 0.02 inch increments

166
Q

The amount of energy reflected from a discontinuity is dependent on

A

The size of the discontinuity and the orientation of that discontinuity

167
Q

The presence of the discontinuity will not produce a specific indication on the CRT screen went which of the following techniques is being used (straight beam testing, surface wave testing, angle beam testing, through transmission testing, pulse echo testing)

A

Through transmission testing

168
Q

Lack of parallelism between the entry surface and the back surface

A

May result in a screen pattern that does not contain back reflection indications

169
Q

Significant error in ultrasonic thickness measurement can occur if

A

the velocity of propagation deviates substantially from assumed constant value for a given material

170
Q

In contact testing, shear waves can be induced in the test material by

A

Using and angle beam transducer with the transducer mounted on a plastic wedge so that the sound enters that part at an angle

171
Q

The most commonly used method of produced in shear waves in the test part when inspecting by the immersion method is by

A

Angulating the search tube to the proper angle with respect to the entry surface of the test part

172
Q

In immersion testing, proof that the search unit is normal to a flat entry surface is indicated by

A

The maximum reflection amplitude from the entry surface

173
Q

In immersion testing, the water distance of between the search unit and the test piece

A

Should be this same as the water distance used during calibration

174
Q

Generally, the best ultrasonic testing technique for detecting discontinuities orientated along the fusion zone in the welded plate is

A

An angle beam method using a shear waves

175
Q

Thin sheets may be inspected for laminar discontinuities with the ultrasonic wave directed normal to the surface by observing

A

The multiple reflection pattern

176
Q

Ultrasonic inspection of castings is occasionally impractical because of

A

Course grain structure

177
Q

Angle beam testing of plate will often miss

A

Laminations that are parallel to the front surface

178
Q

Reflection indications from a weld area being inspected by the angle beam technique may represent

A

Porosity, cracks, weld bead

179
Q

An ultrasonic the test using a straight beam contact search you and that is being conducted to the thickness of a flat part such as plate. This test should detect

A

Laminar type flaws with major dimensions parallel to the plane of the rolled surface

180
Q

The resonance technique of thickness measurement has been mostly replaced by

A

Linear time base pulse echo techniques

181
Q

Ultrasonic testing techniques are useful in testing laminate and sandwich construction test objects for

A

Bond integrity

182
Q

Ultrasonic techniques are frequently used to in online automatic process control applications to measure and control

A

The thickness of cold rolled strips, sheets and plates

183
Q

Which of the following statements about field inspection applications of ultrasonic testing is true (the equipment is large and bulky, field inspections are difficult, aircraft and other field maintenance inspections require three persons, digital displays must be used for all of our inspection because of limited brightness, field inspections are limited to discontinuity detection by contact technique only, none of these)

A

None of these

184
Q

What is considered the typical spectral range of visible light for most humans

A

380 - 770 nanometers

185
Q

What element of the eye functions the same as the photographic plane of the camera

A

The retina

186
Q

A surface has a diffuse reflection when

A

A fuzzy reflection of the light source is seen

187
Q

The resolution of the human eye at a distance of about 12 inches is nearest

A

0.003 inches

188
Q

Are routine direct visual inspection, the eye should be located at a distance

A

Between 12 and 24 inches

189
Q

The angle the eye makes with respect to the normal inspections surface should not

A

Exceed 45 degrees

190
Q

The minimum lighting condition recommended for detecting small cracks in welds is

A

500 lux

191
Q

What is the name of the condition of eye adaptation to a dark environment

A

Scotopic vision

192
Q

The spectral range of vision response in humans is

A

Dependent on lighting conditions

193
Q

IES is the abbreviation for

A

Illuminating engineering society

194
Q

The eye is functionally blind when it is

A

Moving between observation points

195
Q

When looking for surface conditions, the illumination angle should be

A

Between five and 45 degrees, measured from the part surface

196
Q

Fluorescence is defined as

A

Absorbing and emitting light at different wavelengths

197
Q

Pillowing found when inspecting aircraft skins is usually attributed to

A

Expansion of corrosion products under the skin

198
Q

When inspecting extrusions for excessive of draw marks under a pair of long fluorescent tubes

A

It is best to align the probable direction of the draw marks parallel to the tubes

199
Q

The heat affected zone of carbon steel welds is made visible through the use of

A

etchants to enhance the visibility of the micro structure

200
Q

inspection schemes to that rely on optical interference patterns include

A

Moire imagery, holography, Interferometry

ASNT (4 decks)

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