Flash card J
The fill factor when a 19 mm (0.75 in.) diameter bar is inserted in a 25.4 mm (1 in.) outside diameter coil is:
.56 (56%)
The approximate radiographic equivalence factors for steel and copper at 22kV are 1.0 and 1.4 respectively. If it is desirable to radiograph an 0.5 inch plate of copper, what thickness of steel would require about the same exposure characteristics.
0.7 in. Of steel.
In a visual examination of a weld, one would be looking for:
1. Dimensional accuracy of the weldment 2. Surface discontinuities 3. Acceptability of welds with regard to appearance 4. Infilled craters, pock marks, undercuts, overlaps, cracks, and arc strikes.
The transfer exposure technique, sometimes called the indirect technique, uses neutron converters that have reasonably long radioactive half-life. Which of the following would be a good candidate?
1. Indium 2. Dysprosium
Attenuation of X-rays in low energy radiography (under 300kV) commonly used for testing takes place through:
1. Photoelectric absorption 2. Compton absorption
The lateral diffusion or bleeding from a penetrant entrapment may cause:
1. Small adjacent flaw indications to become lost within the spreading indications of large entrapments 2. Indications appearing much larger than the actual discontinuity 3. Indications whose size is exaggererated when the maximum dwell time is exceeded
The penetration of eddy currents in a conductive material is decreased when
1. Test frequency 2. Conductivity of the specimen 3. Permeability of the specimen are increased
The rare earths are frequently used in neutron radiography. An interesting feature of this family of elements is:
1. That they have nearly identical chemical properties and are, therefore, difficult to tell apart 2. That they make up about one-sixth of all natuarally one position in the Periodic Table 3. That they have large absorption cross sections for neutrons
The amount of energy reflected from a discontinuity will be dependent on:
1. The size of the discontinuity 2. The orientation of the discontinuity 3. the type of discontinuity
On a blue print, a width dimension of a part is specified as 2.513 + 0.002, -0.005. The part can be manufactured with width dimensions between ___________to ______________ inch.
2.508-2.515
Which of the following frequencies would probably result in the greatest ultrasonic attenuation losses?
25 megaHertz
The recommended maximum recertification interval in SNT-TC-1A for a Level III is:
5 years
If an exposure time of 60 seconds and a source-to-film distance of 4 ft. Is necessary for a particular exposure, what exposure time would be needed for an equivalent exposure if the source-to-film distance is changed to 5 ft.
94 sec
SNT-TC-1A recommends a trainee should obtain work experience by working with
A certified individual
Level III recertification in accordance with CP-189 requires:
A current ASNT NDT Level III certificate in the same method.
All types of developers should be applied in:
A thin-uniform thickness
In a residual magnetic particle examination, the magnetic particles are applied
After the part has been magnetized
The unique and important properties of the neutron in neutron radiography comes primarily from the fact that it is a nuclear particle that is electrically neutral. The lack of electric charge means that its electrostatic interaction with the atom's electrons is:
Almost completely negligible
A curve relating density with the logarithm of exposure or of relative exposure is called
An H&D curve
SNT-TC-1A recommends that vision tests for near distance visual acuity for NDT Level I and NDT Level II personnel should be conducted upon initial certification:
And at 1 year intervals thereafter.
A CP-189 certification procedure shall be:
Approved by the employer's designated Level III
the absorption property of a developer refers to its ability to:
Assimilate penetrant into its bulk
CP-189 requires the NDT Level III, responsible for administration and grading of NDT examination must:
Be a holder of a current ASNT Level III certificate in the method
According to SNT-TC-1A an NDT Level III individual should:
Be capable of developing, qualifying, and approving procedures.
CP-189 requires experience records to:
Be verified for initial and continuing experience
To meet CP-189, what MT test techniques must be satisfactorily demonstrates in a Level I practical examination in order to quality an individual whose job will require performing both bench and yoke examinations?
Bench and yoke tests must each be demonstrated
Which action by an ASNT-certified Level III would be considered a violation of Level III Code of Ethics?
Certifying NDT personnel without adequate knowledge of their capabilities
What is the first step to determine if an indication is false?
Clean and demagnetize
Flaws in the imaging screens can be separated from actual flaws in a part being radiographed by:
Comparing a neutron radiograph of the parts to a blank neutron radiograph of the same imaging screen with no parts in place
Which of the following items would not be needed in the qualification records of a SNT-TC-1A program?
Copies of last certification company examinations
A term to define a property of a test system which enables the separation of signals due to discontinuities in the test specimen that are located in close proximity to each other is:
Discontinuity resolution
According to SNT-TC-1A the NDT Instructor:
Does not have to be qualified in CP-189
Before applying a dry developer to a surface where excess water-washable penetrants have been removed, the surface must be:
Dry
Which of the following types of developers are not normally used with visible dye penetrants?
Dry
The differences in sensitivities of a manufacurer's fluorescent penetrants are usually obtained by varying the:
Dye concentrations
Which of the following conversion screens has the longest half life?
Dysprosium
In accordance with SNT-TC-1A, specific examinations should include questions which cover:
Equipment, operating procedures and NDT techniques that an individual may encounter during specific assignments.
If it is not apparent that a fillet weld is either convex or concave, what procedure should be followed for assuring the weld has the proper size?
Examine both fillet weld legs with both convex and concave gages
A longitudinal crack in the center of the root pass of a weld was most likely caused by
Expansion and contraction of the joint material during and after welding
When a level III retires, his/her certification in accordance with CP-189
Expires
the activity of the fixer diminishes after being used for a period of time because the
Fixer solution accumulates soluble silver salts
Which of the following neutron radiography converter foils cannot be used for transfer or indirect radiography?
Gadolinium
Which of the following is recommended by SNT-TC-1A for Level III certification?
Graduated from a four-year engineering or science curriculum from a college or university plus one year experience in NDT comparable to that of a NDT Level II
The current wave form which has the deepest penetration is:
Half wave direct current
One requirement of CP-189 for instructors is:
Have 10 or more years of experience as a level II in the method they instruct.
The quality of the results from a neutron radiographic facility is best determined by:
Image-quality indicators
Which of the following is the primary function of a film interpreter?
Indentify discontinuities and manufacturing deviations standards
Companies issuing SNT-TC-1A certificates should revoke any NDT certification when the employee:
Is terminated
A thin sheet of gadolinium foil, in intimate contact with photographic film during neutron exposure, will increase film density because:
It emits electrons that darken the film
Which of the following technique variable is most commonly used to adjust subject contrast?
Kilovoltage
At a fixed test frequency, in which of the following materials will the eddy current penetration be greatest?
Lead (7 percent IACS conductivity)
In general, which of the following modes of vibration would have the greatest penetrating power in a coarse grained material if the frequency of the waves are the same?
Longitudinal
What is the orientation of most discontinuities found in groove welds?
Longitudinal
When certifying NDT Level III personnel to SNT-TC-1A, the employer:
May accept an ASNT Level III certification to satisfy part of the qualification requirements
For individuals with only a high school education, the number of training hours recommended by SNT-TC-1A:
May be adjusted to reflect the candidate's actual education level
A requirement for a CP-189 Level III certification is that the candidate:
Must possess a current valid ASNT NDT Level III certificate in the applicable method
Which qualification is addressed in CP-189 but not SNT-TC-1A
NDT Instructor
The term used to define the difference between actual instrument output and expected output as definite by a straight line calibration curve is:
Nonlinearity
A level III certified to SNT-TC-1A, should have a general familiarity with:
Other appropriate NDT methods
Which of the following materials is very weakly magnetic
Paramagnetic
If a Level II candidate wishes to use a 40 hour NDT Training Course for qualification towards CP-189 certification, they must:
Pass a final exam.
When testing by the eddy current method, discontinuities will be most easily detected when the eddy currents are:
Perpendicular to the major plane of the discontinuity
A term used to define the timing relationships involved in alternating current signals is:
Phase
The quantitative measure of film blackening is referred to as
Photographic density
the transducer most commonly found in ultrasonic search units (probes) used for discontinuity testing utilize
Piezoelectric principles
Which of the following are not functions that a good developer would have
Prevent the spread of penetrant in developer coating
A qualitative term often used to indicate the size of the smallest detail which can be seen in a radiograph is
Radiographic sensitivity
The best method for determining how resolution affects the ability to interpret the radiograph of parts is by
Radiographing parts that have known measured defects
An ASNT Level III, looking for employment, alters his certificate and is reported to ASNT headquarters. ASNT Headquarters would most likely:
Refer the incident to the ASNT Certification Management Council Ethics Subcommittee.
when the magnetizing force which produced a magnetic field in a part made of ferromagnetic material has been reduced to zero, the magnetic field remaining in the part is termed:
Residual
A company's written practice, according to SNT-TC-1A, should include the:
Responsibility of each level of certification for determining the acceptability of materials and components
The formula Sin/V 1=Sin 2/V2 is referred to as
Snell's law
What mechanism is responsible for the greater sensitivity of nonaqueous developers?
Solvent mixing with entrapped penetrant and expanding its volume
A testing technique in which the crystal or transducer is parallel to the test surface and ultrasonic waves enter the material being tested in a direction perpendicular to the test surface is:
Straight beam testing
What type of developers should be adequately agitated before application to test parts?
Suspensions
CP-189 states, when a candidate for certification is working in two methods of NDT:
The candidate must meet the required minimum hours in each method and the total hours in NDT for the method requiring the most total hours
In the certification of a company's personnel to SNT-TC-1A, the employer must assure NDT personnel have been qualified in accordance with
The certifying company's written practice
In a head shot, the amount of current is determine by:
The diameter or diagonal of the test part
If an employer chooses to increase the number of questions for a specific examination over the recommended number in SNT-TC-1A, which of the following meets the recommendations of SNT-TC-1A?
The employer's written practice should state the number of questions that are required
The deeper a discontinuity is from a surface:
The more diffuse becomes the indication pattern
When prods are used, the current is determined by:
The prod separation
In order to decrease the effect on conductivity readings due to variations in test part thickness:
The test frequency should be increased
Subject contrast is affected by
Thickness differences in specimen radiation quality scattered radiation
The responsibility for compliance with SNT-TC-1A lies with:
This is not addressed in SNT-TC-1A
A device which transforms energy from one form to another form is called a
Transducer
For direct neutron radiography, precaution has to be taken to reduce the gamma ray background of most sources as this tends to obscure the neutron radiograph. This may be done by:
Using filtration of gamma rays
The distance from a given point on a ultrasonic wave to the next corresponding point is referred to as:
Wavelength
In general, shear waves are more sensitive to small discontinuities than longitudinal waves for a given frequency and in a given material because the:
Wavelength of shear waves is shorter than the wavelength of longitudinal waves
The strength of the magnetic field within a coil is_________at the center of the coil compared to the field at the edge of the coil
Weaker
Before applying an aqueous type of developer to a surface where excess water-washable penetrants have been removed, the surface can be:
Wet or dry
SNT-TC-1A recommends that an individual in the process of being qualified to Liquid Penetrant NDT Level I should
Work with a NDT Level 1 or Level II Pt person
Which statement is true regarding SNT-TC-1A trainees? They should:
Work with a certified individual
The inductive reactance of a test coil can be calculated using the formula
XL=2pie f L
If a certification program is to meet the minimum recommendations of SNT-TC-1A, do the following NDT Level II examination scores meet the minimum recommendations? (General 72%, Specific 78%, and Practical 90%)
Yes
Which of the following materials would have the highest resistivity value?
Zirconium with a 3.4 percent IACS rating
The product of the sound velocity and the density of a material is known as the
acoustic impedance of the material
If a part is magnetized in a head shot or using a central conductor, the discontinuity which can be detected is located
longitudinally
The ASNT Level III certificate:
remains valid when employment is terminated
When an employer has more than one NDT Level III in a specific method, CP-189 requires:
that the employer designated a principal NDT Level III for that method
In accordance with SNT-TC-1A, certification is defined as indicating that a person has:
written testimony verifying their qualification in a method
