Jj Ure 3 Non D
Unit review 3 NDI
Questions and Answers
- 1.
(401) What produces an alternating magnetic field in eddy current testing?
- A.
Coil
- B.
Unit
- C.
Probe
- D.
Current
Correct Answer
C. ProbeExplanation
In eddy current testing, a probe is used to produce an alternating magnetic field. This magnetic field induces eddy currents in the material being tested, which can then be detected and analyzed to assess the material's properties or detect any defects. The probe is designed to generate the required magnetic field and is an essential component of the eddy current testing process.Rate this question:
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- 2.
(401) Current that is flowing through a circuit is measured in
- A.
Volts
- B.
Hertz
- C.
Ohms
- D.
Amperes
Correct Answer
D. AmperesExplanation
The current flowing through a circuit is measured in amperes. Amperes, also known as amps, are the unit of measurement for electric current. It represents the rate at which electric charge flows in a circuit. Volts measure the electric potential difference, hertz measure the frequency of alternating current, and ohms measure the resistance in a circuit. However, in this case, the question specifically asks about the unit for measuring current, which is amperes.Rate this question:
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- 3.
(401) What do you use to detect differences between permeability variations and cracks?
- A.
Phase detection
- B.
Impedance testing
- C.
Electomagnetic fields
- D.
Electrical conductivity
Correct Answer
A. pHase detectionExplanation
Phase detection is used to detect differences between permeability variations and cracks. Phase detection is a technique that measures the phase shift of an electromagnetic wave as it passes through a material. By analyzing the phase shift, variations in the material's permeability can be detected. This method is particularly effective in identifying cracks, as they often cause changes in a material's permeability. Therefore, phase detection is a suitable method for detecting differences between permeability variations and cracks.Rate this question:
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- 4.
(402) Eddy current inspection can do all of the following except?
- A.
Detect all subsurface cracks
- B.
Determine material properties
- C.
Detect discontinuities in materials
- D.
Measure thickness of thin metals, conductive coatings, and non-conductive coatingsÂ
Correct Answer
A. Detect all subsurface cracksExplanation
Eddy current inspection is a non-destructive testing method that uses electromagnetic induction to detect surface and near-surface flaws or defects in conductive materials. It is effective in detecting discontinuities in materials, determining material properties, and measuring the thickness of thin metals, conductive coatings, and non-conductive coatings. However, it is not suitable for detecting all subsurface cracks as it primarily focuses on surface and near-surface defects. Therefore, the correct answer is "Detect all subsurface cracks."Rate this question:
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- 5.
(402) 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?
- A.
3
- B.
5
- C.
10
- D.
15
Correct Answer
B. 5Explanation
The effective depth of penetration refers to the depth in the inspection article where the magnetic field strength or intensity of the induced eddy currents is reduced to 5% of the value at the surface. This means that the magnetic field strength decreases as the depth increases, and at the effective depth of penetration, it is only 5% of its original value at the surface.Rate this question:
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- 6.
(402) When a test coil is moved away from a part due to lift-off, magnetic coupling between the test coil and inspection part
- A.
Is increased
- B.
Is decreased
- C.
Stays the same
- D.
Will remain constant
Correct Answer
B. Is decreasedExplanation
When a test coil is moved away from a part due to lift-off, the magnetic coupling between the test coil and inspection part is decreased. This is because the distance between the test coil and the part increases, leading to a decrease in the strength of the magnetic field that links the two. As a result, the magnetic coupling, which represents the degree of interaction between the coil and the part, decreases.Rate this question:
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- 7.
(402) What effect do surface eddy currents, the secondary field, and depth of penetration have on poor conductivity?
- A.
Weaker surface eddy currents, weaker secondary field, and a greater depth of penetration
- B.
Weaker surface eddy currents, stronger secondary field, and weaker depth of penetration
- C.
Stronger surface eddy currents, weaker secondary field, and a greater depth of penetration
- D.
Stronger surface eddy currents, stronger secondary field, and weaker depth of penetration
Correct Answer
A. Weaker surface eddy currents, weaker secondary field, and a greater depth of penetrationExplanation
Poor conductivity is affected by weaker surface eddy currents, weaker secondary field, and a greater depth of penetration. Surface eddy currents are induced currents that flow near the surface of a conductor and are responsible for energy losses. Weaker surface eddy currents indicate poor conductivity. The secondary field is the magnetic field produced by the eddy currents, and a weaker secondary field also indicates poor conductivity. A greater depth of penetration means that the eddy currents penetrate deeper into the material, indicating poor conductivity. Therefore, all three factors contribute to poor conductivity.Rate this question:
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- 8.
(403) Which mode of operation has two small sensing coils wound side-by-side in the shape of two back-to-back capital D's?
- A.
Absolute
- B.
Reflection
- C.
Differential
- D.
Driver/receiver
Correct Answer
C. DifferentialExplanation
The correct answer is Differential. Differential mode of operation has two small sensing coils wound side-by-side in the shape of two back-to-back capital D's. This configuration allows the coils to detect any difference in the magnetic field between them, which is useful in applications where detecting small changes or variations is important.Rate this question:
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- 9.
(403) Which type of eddy current coil has differential sensors that are directionally sensitive and provide detection of crack tips?
- A.
Contact coil
- B.
Conformal coil
- C.
Inside diameter coil
- D.
Outside diameter coil
Correct Answer
B. Conformal coilExplanation
A conformal coil is a type of eddy current coil that has differential sensors which are directionally sensitive. This means that they can detect the direction of crack tips. Therefore, a conformal coil is able to provide detection of crack tips. Contact coils, inside diameter coils, and outside diameter coils do not have this directional sensitivity and therefore cannot provide the same level of crack tip detection as a conformal coil.Rate this question:
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- 10.
(403) What happens when a eddy current probe coil arrangement is closer to the test surface?
- A.
Large cracks can be detected due to lower sensitivity
- B.
Small cracks can be detected due to greater sensitivity
- C.
Small cracks can be detected due to lower signal to noise
- D.
Large cracks can be detected due to greater signal to noise
Correct Answer
B. Small cracks can be detected due to greater sensitivityExplanation
When an eddy current probe coil arrangement is closer to the test surface, the sensitivity of the probe increases. This means that the probe becomes more capable of detecting smaller cracks. The closer proximity allows the probe to detect even the tiniest cracks with greater accuracy and precision. Therefore, small cracks can be detected due to the increased sensitivity of the eddy current probe coil arrangement.Rate this question:
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- 11.
(404) Eddy current instruments must have all of these capabilities except?
- A.
Low noise
- B.
Sensitivity
- C.
Ruggedness
- D.
Dependability
Correct Answer
D. DependabilityExplanation
Eddy current instruments are used for non-destructive testing and inspection. They rely on the interaction between an alternating magnetic field and electrical currents induced in conductive materials. In order for these instruments to be effective, they need to have low noise to ensure accurate measurements, sensitivity to detect small variations in the material being tested, and ruggedness to withstand harsh environments. Dependability, on the other hand, is not a required capability for eddy current instruments as it refers to the reliability and consistency of the instrument's performance over time.Rate this question:
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- 12.
(404) Eddy current instruments are designed to measure what three signal qualities?
- A.
Amplitude, phase, and frequency
- B.
Impedance, resistance, and inductive reactance
- C.
Depth of penetration, signal-to-noise ratio, and impedance
- D.
Conductivity, magnetic permeability, and discontinuities
Correct Answer
A. Amplitude, pHase, and frequencyExplanation
Eddy current instruments are designed to measure the amplitude, phase, and frequency of signals. Amplitude refers to the strength or intensity of the signal, phase indicates the relative position of the signal in a waveform, and frequency represents the number of cycles or oscillations of the signal per unit of time. These three signal qualities are important in analyzing and characterizing eddy currents, which are circular electrical currents induced in a conductor by a changing magnetic field. By measuring these signal qualities, eddy current instruments can provide valuable information about the material properties, such as conductivity and magnetic permeability, as well as the presence of any discontinuities in the material.Rate this question:
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- 13.
(404) 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?
- A.
Bolthole inspection
- B.
Conductivity testing
- C.
Magneto-optic imaging
- D.
Impedance plane testing
Correct Answer
C. Magneto-optic imagingExplanation
Magneto-optic imaging 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. This technique combines the principles of magnetism and optics to visualize magnetic fields. By using a magneto-optic material, such as yttrium iron garnet, changes in the magnetic field can be observed as changes in the polarization state of light passing through the material. This allows for the detection and imaging of magnetic field disturbances, making magneto-optic imaging the correct answer.Rate this question:
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- 14.
(405) How do you remove dust when cleaning an eddy current instrument?
- A.
Use soap and water
- B.
Use a lint-free cloth
- C.
Use a solvent and lint-free cloth
- D.
You do not need to clean eddy current instruments
Correct Answer
B. Use a lint-free clothExplanation
To remove dust when cleaning an eddy current instrument, it is recommended to use a lint-free cloth. This type of cloth is designed to pick up dust particles without leaving any lint behind, ensuring a thorough and clean surface. Using a lint-free cloth minimizes the risk of introducing additional contaminants or damaging the instrument during the cleaning process.Rate this question:
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- 15.
(406) Paint or other nonconductive coatings should be removed when in excess of how much of an inch?
- A.
0.003
- B.
0.005
- C.
0.007
- D.
0.010
Correct Answer
D. 0.010Explanation
According to the given question, paint or other nonconductive coatings should be removed when they are in excess of 0.010 of an inch. This means that if the thickness of the paint or coating exceeds 0.010 of an inch, it should be removed.Rate this question:
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- 16.
(407) 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?
- A.
Dot.
- B.
Lift-off
- C.
Null-point
- D.
Response
Correct Answer
C. Null-pointExplanation
The null-point is the location on an impedance plane at which an eddy current instrument is usually called the "good" or reference condition. At the null-point, the impedance of the eddy current instrument is balanced, resulting in a minimal or zero output signal. This reference condition allows for accurate measurements and calibration of the instrument.Rate this question:
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- 17.
(407) What type of filter removes the low frequency components of the eddy current signal from the bridge?
- A.
Bandpass
- B.
Low-pass
- C.
High-pass
- D.
Noise-pass
Correct Answer
C. High-passExplanation
A high-pass filter is used to remove low frequency components from a signal, allowing only the high frequency components to pass through. In the context of eddy current signals, which are typically used in non-destructive testing to detect surface defects or measure conductivity, a high-pass filter would be employed to eliminate any low frequency noise or interference that may be present in the signal. This filtering process helps to enhance the accuracy and reliability of the eddy current measurements by focusing on the relevant high frequency information.Rate this question:
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- 18.
(407) Modulation analysis is useful in separating signals of interest from other signals and relies on the analysis of what?
- A.
Time
- B.
Frequency
- C.
Sensitivity
- D.
Depth of penetration
Correct Answer
A. TimeExplanation
Modulation analysis is useful in separating signals of interest from other signals. This process relies on the analysis of time, as it involves examining the variations and changes in the signal over time. By studying the time domain characteristics of the signal, such as its amplitude, phase, and frequency variations, modulation analysis can help distinguish the desired signals from unwanted interference or noise.Rate this question:
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- 19.
(407) While repeatedly scanning the 0.020 inch notch on an aluminum standard, vertical and horizontal gain must be increased to reach how much of the full screen height during initial nulling?
- A.
50 percent
- B.
80 percent
- C.
90 percent
- D.
100 percent
Correct Answer
B. 80 percentExplanation
To reach the initial nulling of the 0.020 inch notch on an aluminum standard, both the vertical and horizontal gain need to be increased. This indicates that the notch is not initially visible on the full screen height. Out of the given options, the correct answer is 80 percent, which suggests that the gain needs to be increased to 80 percent of the full screen height in order to null the notch.Rate this question:
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- 20.
(408) Inspection for cracks, measurement of conductivity, or hardness can often be complicated by what two factors?
- A.
Surface damage and human error
- B.
Human error and service induced processes
- C.
Surface damage and manufacturing processes
- D.
Service induced and manufacturing processes
Correct Answer
C. Surface damage and manufacturing processesExplanation
Inspection for cracks, measurement of conductivity, or hardness can often be complicated by surface damage and manufacturing processes. Surface damage refers to any physical harm or alteration to the surface of the material being inspected, which can make it difficult to accurately assess its condition. Manufacturing processes, on the other hand, can introduce variations or defects into the material that affect its properties and make it harder to measure conductivity or hardness. Therefore, both surface damage and manufacturing processes can complicate the inspection and measurement processes.Rate this question:
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- 21.
(408) The direction of tensile stress cracks are often analyzed by
- A.
Stress factors and crack location
- B.
Engineer stress tests and historical cracking in the part
- C.
Tensile stress cracks are never the same and therefore cannot be analyzed
- D.
Nondestructive inspection (NDI) historical data and engineer dispositions
Correct Answer
B. Engineer stress tests and historical cracking in the partExplanation
The direction of tensile stress cracks can be analyzed by conducting engineer stress tests on the part and studying the historical cracking patterns. By subjecting the part to controlled stress conditions and observing the resulting cracks, engineers can determine the direction in which the cracks propagate. Additionally, studying the historical cracking in the part can provide valuable insights into the behavior of tensile stress cracks and help in understanding their direction.Rate this question:
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- 22.
(408) 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?
- A.
Voids
- B.
Stress cracks
- C.
Fatigue cracks
- D.
Stress corrosion cracks
Correct Answer
C. Fatigue cracksExplanation
Fatigue cracks are usually caused by repeated cyclic loading of a structure at lower stress levels than required for visible deformation in fastener holes. This type of loading gradually weakens the material, leading to the formation of small cracks that can eventually grow and cause failure. Fatigue cracks are a common type of defect in structures subjected to cyclic loading, such as aircraft, bridges, and machinery. They can be difficult to detect visually, but their presence can significantly compromise the structural integrity of the affected component.Rate this question:
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- 23.
(409) Conductivity is commonly measured in units of
- A.
Mho
- B.
Mhz
- C.
Ohms
- D.
Amperes
Correct Answer
A. MhoExplanation
Conductivity is commonly measured in units of mho, which is the reciprocal of ohms. Mho is the unit of conductance, which is the measure of how easily an electric current flows through a material. It is the inverse of resistance, measured in ohms. The higher the conductivity, the lower the resistance, indicating a better conductor of electricity. Hence, mho is the correct unit for measuring conductivity.Rate this question:
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- 24.
(409) Alloy effects on conductivity are caused by all of these except?
- A.
Annealing
- B.
Cold working
- C.
Solution heat-treating
- D.
Precipitation hardening
Correct Answer
B. Cold workingExplanation
Alloy effects on conductivity are caused by annealing, solution heat-treating, and precipitation hardening. Cold working, on the other hand, does not have a significant effect on conductivity. Cold working refers to the process of deforming a metal at room temperature, which can increase its strength but may also introduce dislocations and distortions in the crystal lattice. These dislocations can hinder the movement of electrons and therefore negatively impact conductivity.Rate this question:
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- 25.
(409) Conductivity decreases about how much in percent International Annealed Copper Standard (IACS) for a 20 degree Farenheit temperature increase for aluminum alloys?
- A.
One
- B.
Three
- C.
Five
- D.
Seven
Correct Answer
A. OneExplanation
Conductivity decreases by one percent in the International Annealed Copper Standard (IACS) for a 20 degree Fahrenheit temperature increase for aluminum alloys.Rate this question:
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- 26.
(409) What is conductivity probe selection based on?
- A.
Temper
- B.
Thickness
- C.
Material velocity
- D.
Copper standards
Correct Answer
B. ThicknessExplanation
Conductivity probe selection is based on thickness. The thickness of the material being tested determines the type of conductivity probe that should be used. Different probes are designed for different thickness ranges, and selecting the appropriate probe ensures accurate conductivity measurements.Rate this question:
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- 27.
(410) What is the advancement of a wave through a medium by transferring energy from one molecule to another?
- A.
Period
- B.
Velocity
- C.
Frequency
- D.
Propagation
Correct Answer
D. PropagationExplanation
Propagation is the correct answer because it refers to the advancement of a wave through a medium by transferring energy from one molecule to another. This process involves the wave moving through the medium, causing the molecules to vibrate and transfer energy to neighboring molecules, thus allowing the wave to propagate or travel through the medium.Rate this question:
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- 28.
(410) Ultrasonic vibrations generate by applying electrical energy to what part of the transducer?
- A.
Piezoelectric element
- B.
Test part
- C.
Vacuum
- D.
Wedge
Correct Answer
A. Piezoelectric elementExplanation
Ultrasonic vibrations are generated by applying electrical energy to the piezoelectric element of the transducer. Piezoelectric materials have the ability to convert electrical energy into mechanical vibrations, and vice versa. When an electric current is applied to the piezoelectric element, it undergoes deformation and produces ultrasonic vibrations. These vibrations are then transmitted through the transducer and used for various applications such as medical imaging, non-destructive testing, and cleaning. The other options, test part, vacuum, and wedge, are not directly involved in generating ultrasonic vibrations.Rate this question:
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- 29.
(411) Which wave mode is used extensively for thickness inspections, corrosion thinning, and for the detection of other defects parallel to the inspection surface?
- A.
Lamb
- B.
Shear
- C.
Surface
- D.
Longitudinal
Correct Answer
D. LongitudinalExplanation
Longitudinal wave mode is used extensively for thickness inspections, corrosion thinning, and for the detection of other defects parallel to the inspection surface. This is because longitudinal waves travel in the same direction as the wave propagation, allowing them to effectively penetrate through materials and provide accurate information about the thickness and condition of the inspected surface.Rate this question:
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- 30.
(411) What is the angle between an incident longitudinal wave and a line normal to the surface called?
- A.
Elastic modulus
- B.
Incident angle
- C.
Reflection
- D.
Refraction
Correct Answer
B. Incident angleExplanation
The incident angle is the angle between an incident longitudinal wave and a line normal to the surface. This angle determines the direction in which the wave will be reflected or refracted upon encountering the surface.Rate this question:
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- 31.
(411) What is the term for a change in direction of an ultrasonic beam as it passes through the interface between two materials with different acoustic velocity?
- A.
Reflection
- B.
Refraction
- C.
Rarefaction
- D.
Mode conversion
Correct Answer
B. RefractionExplanation
Refraction is the term used to describe the change in direction of an ultrasonic beam as it passes through the interface between two materials with different acoustic velocity. This phenomenon occurs due to the change in speed of the sound waves as they transition from one medium to another. Refraction is commonly observed when ultrasound waves pass through tissues of varying densities in medical imaging applications.Rate this question:
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- 32.
(412) Extending from the face of the transducer is an area characterized by wide variations in sound beam intensity known as
- A.
Far field
- B.
Near field
- C.
Dead zone
- D.
Beam spread
Correct Answer
B. Near fieldExplanation
The correct answer is near field. The near field refers to the area close to the transducer where the sound beam is still converging and has not yet fully formed. In this region, there are wide variations in sound beam intensity due to the focusing of the beam. This area is important for imaging as it provides detailed resolution and allows for the detection of small structures.Rate this question:
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- 33.
(412) During beam spread, sound extends outward from the transducer and does what to intensity and distance?
- A.
Increases in intensity with increasing distance
- B.
Increases in intensity with decreasing distance
- C.
Decreases in intensity with increasing distance
- D.
Decreases in intensity with decreasing distance
Correct Answer
C. Decreases in intensity with increasing distanceExplanation
During beam spread, sound waves spread out as they travel away from the transducer. This spreading causes the intensity of the sound waves to decrease with increasing distance. As the sound waves spread out over a larger area, the same amount of energy is distributed over a larger area, resulting in a decrease in intensity. Therefore, the correct answer is "Decreases in intensity with increasing distance."Rate this question:
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- 34.
(412) Acoustic pressure directly relates to what in the material particle vibrations caused by sound waves?
- A.
Intensity
- B.
Frequency
- C.
Amplitude
- D.
Attenuation
Correct Answer
C. AmplitudeExplanation
Acoustic pressure directly relates to the amplitude of the material particle vibrations caused by sound waves. Amplitude refers to the maximum displacement of a particle from its equilibrium position as it oscillates due to the sound wave. The greater the amplitude, the higher the acoustic pressure, resulting in a louder sound. Therefore, amplitude is the correct answer in this context.Rate this question:
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- 35.
(413) What is a fine-delay control used to compensate for transducer faceplate wear?
- A.
Range
- B.
Delay
- C.
Velocity
- D.
Zero offset
Correct Answer
D. Zero offsetExplanation
A fine-delay control is used to compensate for transducer faceplate wear by adjusting the zero offset. As the transducer faceplate wears over time, the zero offset can change, leading to inaccurate measurements. By using the fine-delay control, the zero offset can be adjusted to ensure that the measurements remain accurate despite the wear on the transducer faceplate.Rate this question:
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- 36.
(413) What electronically compensates for material attenuation?
- A.
Distance amplitude correction (DAC)
- B.
Single/Dual transducer
- C.
Gate trigger lever
- D.
Reject
Correct Answer
A. Distance amplitude correction (DAC)Explanation
Distance amplitude correction (DAC) electronically compensates for material attenuation. Material attenuation refers to the reduction in the amplitude of an ultrasonic wave as it travels through a material. DAC adjusts the amplitude of the ultrasonic signal based on the distance traveled, compensating for the loss of signal strength due to attenuation. This ensures that the received signal accurately represents the true condition of the material being inspected, allowing for more accurate flaw detection and measurement.Rate this question:
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- 37.
(414) What moves the part surface out of the dead zone, thereby improving near-surface resolution?
- A.
Reject
- B.
Resolution
- C.
Delay lines
- D.
Contact transducers
Correct Answer
C. Delay linesExplanation
Delay lines are used to move the part surface out of the dead zone, which is an area where the resolution is poor. By using delay lines, the ultrasound waves can travel a longer distance before reaching the part surface, allowing for better near-surface resolution. Contact transducers are not responsible for improving near-surface resolution.Rate this question:
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- 38.
(415) Which couplant is authorized for use without specific engineering approval?
- A.
Gel
- B.
Glycerin
- C.
Silicones
- D.
Graphite greases
Correct Answer
A. GelExplanation
Gel is the authorized couplant for use without specific engineering approval.Rate this question:
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- 39.
(415) Which American Society of Testing and 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?
- A.
0300-3-7075
- B.
7075-3-0003
- C.
0003-3-7075
- D.
7075-3-0300
Correct Answer
D. 7075-3-0300Explanation
The correct answer, 7075-3-0300, indicates that the ASTM block to be used is made of 7075 aluminum. The first number, 3, represents the diameter of the hole in 1/64 inch increments, which in this case is 3/64 inch. The second number, 0300, represents the metal travel distance in inches, which is 3.0 inches.Rate this question:
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- 40.
(416) 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?
- A.
Refer to precision measurement equipment laboratory (PMEL)
- B.
Send the unit back to the manufacturer
- C.
Give it to your supervisor
- D.
Turn the unit into supply
Correct Answer
A. Refer to precision measurement equipment laboratory (PMEL)Explanation
If you encounter malfunctions or discrepancies with ultrasonic instruments that are not addressed in the technical manual or if the unit does not meet acceptable criteria and cannot be adjusted, the correct course of action is to refer to the precision measurement equipment laboratory (PMEL). PMEL is responsible for calibrating, repairing, and maintaining precision measurement equipment, so they would be the appropriate authority to address these issues. Sending the unit back to the manufacturer, giving it to your supervisor, or turning it into supply would not be the correct actions in this situation.Rate this question:
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- 41.
(417) Which data presentation displays signal amplitudes in various color schemes?
- A.
A-scan
- B.
B-scan
- C.
C-scan
- D.
D-scan
Correct Answer
C. C-scanExplanation
A C-scan is a type of data presentation that displays signal amplitudes in various color schemes. It is commonly used in medical imaging and non-destructive testing to visualize the internal structure of an object. In a C-scan, different colors represent different signal amplitudes, allowing for easier identification and analysis of abnormalities or variations in the scanned object. A-scan, B-scan, and D-scan are different types of data presentations that do not specifically use color schemes to display signal amplitudes.Rate this question:
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- 42.
(417) What ultrasonic technique inspects thin test parts when the dead zone prevents an inspection with another method?
- A.
Lamb
- B.
Pulse-echo
- C.
Angle-beam
- D.
Through-transmission
Correct Answer
D. Through-transmissionExplanation
Through-transmission ultrasonic technique is used to inspect thin test parts when the dead zone prevents an inspection with another method. In through-transmission, two transducers are used, one on each side of the test part. One transducer emits ultrasonic waves, while the other receives them. If there are any defects or abnormalities in the test part, the ultrasonic waves will be attenuated or reflected, indicating a flaw. This technique is particularly useful for thin parts because the dead zone, which is the area close to the transducer where accurate measurements cannot be obtained, can be avoided by using two separate transducers.Rate this question:
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- 43.
(417) Which inspection technique will you use when inspecting around fastener holes, cylindrical components, skins, and welds?
- A.
Lamb wave
- B.
Angle beam
- C.
Surface wave
- D.
Through-transmission
Correct Answer
B. Angle beamExplanation
The correct answer is Angle beam. Angle beam inspection technique is commonly used when inspecting around fastener holes, cylindrical components, skins, and welds. This technique involves sending sound waves at an angle into the material being inspected, allowing for better detection of flaws and defects in these specific areas.Rate this question:
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- 44.
(418) Indications on an ultrasonic waveform display determine the
- A.
Location of a discontinuity
- B.
Location of beam spread
- C.
Refracted beam angle
- D.
Size of a defect
Correct Answer
A. Location of a discontinuityExplanation
The indications on an ultrasonic waveform display determine the location of a discontinuity. This means that when there is a break or inconsistency in the material being tested, the waveform display will show a specific location where this discontinuity is present. This information is crucial for identifying and assessing potential flaws or defects in the material.Rate this question:
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- 45.
(418) 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
- A.
3/4 its peak
- B.
1/2 its peak
- C.
1/4 its peak
- D.
1/8 its peak
Correct Answer
B. 1/2 its peakExplanation
When assessing the outer edges of discontinuities, it is important to note the position of the center of the transducer when the signal amplitude from the discontinuity reduces to 1/2 its peak value. This is because the point at which the signal amplitude reaches 1/2 its peak can indicate the location of the outer edges of the discontinuity. By identifying this point, one can accurately determine the size and position of the defect or flaw being examined.Rate this question:
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- 46.
(419) According to TO 33B-1-2 Nondestructive Inspection General Procedures and Process Controls, when do you complete all ultrasonic process controls?
- A.
Weekly
- B.
Monthly
- C.
Quarterly
- D.
Semi-annually
Correct Answer
C. QuarterlyExplanation
According to TO 33B-1-2 Nondestructive Inspection General Procedures and Process Controls, all ultrasonic process controls are completed on a quarterly basis. This means that the controls, which are used to ensure the accuracy and reliability of ultrasonic inspections, are performed every three months. This regular schedule allows for consistent monitoring and adjustment of the equipment and procedures to maintain high-quality results.Rate this question:
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- 47.
(419) What are the three system process controls required for ultrasonics?
- A.
Linearity, sensitivity, and resolution
- B.
Sensitivity, angle beam, and linearity
- C.
Skew angle, resolution, and angle beam
- D.
Angle beam, point of incidence (POI), and skew angle
Correct Answer
A. Linearity, sensitivity, and resolutionExplanation
Ultrasonics require three system process controls: linearity, sensitivity, and resolution. Linearity ensures that the ultrasonic signal remains proportional to the depth of the flaw being inspected. Sensitivity refers to the ability of the system to detect small flaws or changes in material properties. Resolution is the ability to distinguish between closely spaced reflectors or flaws. These three controls are essential for accurate and reliable ultrasonic testing.Rate this question:
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- 48.
(419) 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 instrument?
- A.
Time base
- B.
Horizontal limit
- C.
Lower linearity limit
- D.
Upper linearity limit
Correct Answer
B. Horizontal limitExplanation
The maximum readable length of deflection in the A-scan presentation of an ultrasonic testing instrument is determined by the horizontal limit. This refers to the maximum distance that can be displayed on the horizontal axis of the A-scan graph. It represents the physical or electrical limit of the instrument's display capabilities, indicating the furthest point that can be accurately measured and displayed.Rate this question:
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- 49.
(419) Instruments are horizontally linear if all the values are equal within
- A.
3.0 percent of the full-scale width
- B.
5.0 percent of the full-scale width
- C.
3.0 percent of the full-scale height
- D.
5.0 percent of the full-scale height
Correct Answer
A. 3.0 percent of the full-scale widthExplanation
Instruments are considered horizontally linear if all the values are equal within 3.0 percent of the full-scale width. This means that the readings of the instrument should not deviate by more than 3.0 percent of the total width of the scale. This ensures that the instrument is accurate and consistent in measuring values along the horizontal axis.Rate this question:
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- 50.
(419) Which reference blocks are used for the system sensitivity check?
- A.
Distance-area blocks
- B.
Miniature angle beam block
- C.
International Institute of Welding (IIW) block
- D.
American Society of Testing and Materials (ASTM) Standard Reference Blocks
Correct Answer
D. American Society of Testing and Materials (ASTM) Standard Reference BlocksExplanation
The American Society of Testing and Materials (ASTM) Standard Reference Blocks are used for the system sensitivity check. These blocks are specifically designed and manufactured to meet the ASTM standards, ensuring their accuracy and reliability. They serve as a benchmark for evaluating the performance of the system and its ability to detect and measure flaws or defects in materials. Using these standardized reference blocks allows for consistent and comparable results across different testing systems and laboratories.Rate this question:
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Sep 01, 2023Quiz Edited by
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May 07, 2020Quiz Created by
Jjarvis72
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