Jj Ure 3 Non D

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  • 1/73 Questions

    (402) Eddy current inspection can do all of the following except?

    • Detect all subsurface cracks
    • Determine material properties
    • Detect discontinuities in materials
    • Measure thickness of thin metals, conductive coatings, and non-conductive coatings 
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Jj Ure 3 Non D - Quiz
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Unit review 3 NDI

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  • 2. 

    (403) Which type of eddy current coil has differential sensors that are directionally sensitive and provide detection of crack tips?

    • Contact coil

    • Conformal coil

    • Inside diameter coil

    • Outside diameter coil

    Correct Answer
    A. Conformal coil
    Explanation
    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.

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  • 3. 

    (403) What happens when a eddy current probe coil arrangement is closer to the test surface?

    • Large cracks can be detected due to lower sensitivity

    • Small cracks can be detected due to greater sensitivity

    • Small cracks can be detected due to lower signal to noise

    • Large cracks can be detected due to greater signal to noise

    Correct Answer
    A. Small cracks can be detected due to greater sensitivity
    Explanation
    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.

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  • 4. 

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

    • Time

    • Frequency

    • Sensitivity

    • Depth of penetration

    Correct Answer
    A. Time
    Explanation
    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.

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  • 5. 

    (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?

    • 50 percent

    • 80 percent

    • 90 percent

    • 100 percent

    Correct Answer
    A. 80 percent
    Explanation
    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.

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  • 6. 

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

    • Period

    • Velocity

    • Frequency

    • Propagation

    Correct Answer
    A. Propagation
    Explanation
    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.

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  • 7. 

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

    • Piezoelectric element

    • Test part

    • Vacuum

    • Wedge

    Correct Answer
    A. Piezoelectric element
    Explanation
    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.

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  • 8. 

    (413) What electronically compensates for material attenuation?

    • Distance amplitude correction (DAC)

    • Single/Dual transducer

    • Gate trigger lever

    • 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.

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  • 9. 

    (414) What moves the part surface out of the dead zone, thereby improving near-surface resolution?

    • Reject

    • Resolution

    • Delay lines

    • Contact transducers

    Correct Answer
    A. Delay lines
    Explanation
    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.

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  • 10. 

    (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?

    • Refer to precision measurement equipment laboratory (PMEL)

    • Send the unit back to the manufacturer

    • Give it to your supervisor

    • 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.

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  • 11. 

    (418) Indications on an ultrasonic waveform display determine the

    • Location of a discontinuity

    • Location of beam spread

    • Refracted beam angle

    • Size of a defect

    Correct Answer
    A. Location of a discontinuity
    Explanation
    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.

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  • 12. 

    (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

    • 3/4 its peak

    • 1/2 its peak

    • 1/4 its peak

    • 1/8 its peak

    Correct Answer
    A. 1/2 its peak
    Explanation
    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.

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  • 13. 

    (420) 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?

    • Angle beam point of incidence (POI)

    • Angle beam angle determination

    • Angle resolution

    • Skew angle

    Correct Answer
    A. Angle beam point of incidence (POI)
    Explanation
    Angle beam point of incidence (POI) is the correct answer because the mark on the side of the transducer indicates the imaginary line through the exit point of the beam that intersects the side of the wedge. This mark helps in determining the point of incidence of the angle beam, which is the location where the sound beam enters the material being tested. By knowing the point of incidence, accurate measurements and calculations can be made in angle beam inspections.

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  • 14. 

    (421) What is the adhesive in any lap joint assembly called?

    • Sandwich panel

    • Bond line

    • Joint line

    • Doubler

    Correct Answer
    A. Bond line
    Explanation
    The adhesive in any lap joint assembly is called the bond line. The bond line refers to the area where the adhesive is applied to join two surfaces together. It is the interface between the adhesive and the materials being bonded. The bond line plays a crucial role in the strength and durability of the joint, as it is responsible for transmitting the applied loads and providing structural integrity.

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  • 15. 

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

    • Doubler

    • Honeycomb

    • Multiple laminate

    • Composite materials

    Correct Answer
    A. Composite materials
    Explanation
    Composite materials are made of a fibrous material embedded in a resin matrix. This combination of materials creates a strong and lightweight material that is commonly used in various industries such as aerospace, automotive, and construction. The fibrous material, such as carbon fiber or fiberglass, provides the strength and stiffness, while the resin matrix holds the fibers together and provides protection. This makes composite materials ideal for applications where high strength and low weight are required.

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  • 16. 

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

    • Fibers

    • Aramid

    • Thermosets

    • Thermoplastics

    Correct Answer
    A. Fibers
    Explanation
    In bonded or composite structures, fibers are the principle load-carrying components. Fibers are strong and provide the structural integrity to the composite material. They are usually made of materials such as carbon, glass, or aramid, and are embedded in a matrix material such as thermosets or thermoplastics. The fibers bear the majority of the load in the structure, while the matrix material provides support and protection to the fibers. This combination of fibers and matrix creates a lightweight and strong material that is commonly used in industries such as aerospace and automotive.

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  • 17. 

    (413) What reduces irrelevant low-level signals and noise on the waveform display?

    • Gain

    • Pulse

    • Reject

    • Frequency

    Correct Answer
    A. Reject
    Explanation
    The correct answer is "Reject". Reject reduces irrelevant low-level signals and noise on the waveform display. By rejecting these signals, the display becomes clearer and more focused on the desired signals, allowing for better analysis and interpretation.

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  • 18. 

    (401) What produces an alternating magnetic field in eddy current testing?

    • Coil

    • Unit

    • Probe

    • Current

    Correct Answer
    A. Probe
    Explanation
    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.

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  • 19. 

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

    • Is increased

    • Is decreased

    • Stays the same

    • Will remain constant

    Correct Answer
    A. Is decreased
    Explanation
    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.

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  • 20. 

    (404) Eddy current instruments must have all of these capabilities except?

    • Low noise

    • Sensitivity

    • Ruggedness

    • Dependability

    Correct Answer
    A. Dependability
    Explanation
    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.

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  • 21. 

    (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?

    • Bolthole inspection

    • Conductivity testing

    • Magneto-optic imaging

    • Impedance plane testing

    Correct Answer
    A. Magneto-optic imaging
    Explanation
    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.

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  • 22. 

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

    • Use soap and water

    • Use a lint-free cloth

    • Use a solvent and lint-free cloth

    • You do not need to clean eddy current instruments

    Correct Answer
    A. Use a lint-free cloth
    Explanation
    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.

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  • 23. 

    (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?

    • Dot.

    • Lift-off

    • Null-point

    • Response

    Correct Answer
    A. Null-point
    Explanation
    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.

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  • 24. 

    (407) What type of filter removes the low frequency components of the eddy current signal from the bridge?

    • Bandpass

    • Low-pass

    • High-pass

    • Noise-pass

    Correct Answer
    A. High-pass
    Explanation
    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.

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  • 25. 

    (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?

    • Voids

    • Stress cracks

    • Fatigue cracks

    • Stress corrosion cracks

    Correct Answer
    A. Fatigue cracks
    Explanation
    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.

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  • 26. 

    (409) Conductivity is commonly measured in units of

    • Mho

    • Mhz

    • Ohms

    • Amperes

    Correct Answer
    A. Mho
    Explanation
    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.

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  • 27. 

    (409) Alloy effects on conductivity are caused by all of these except?

    • Annealing

    • Cold working

    • Solution heat-treating

    • Precipitation hardening

    Correct Answer
    A. Cold working
    Explanation
    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.

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  • 28. 

    (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?

    • Reflection

    • Refraction

    • Rarefaction

    • Mode conversion

    Correct Answer
    A. Refraction
    Explanation
    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.

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  • 29. 

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

    • Increases in intensity with increasing distance

    • Increases in intensity with decreasing distance

    • Decreases in intensity with increasing distance

    • Decreases in intensity with decreasing distance

    Correct Answer
    A. Decreases in intensity with increasing distance
    Explanation
    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."

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  • 30. 

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

    • Range

    • Delay

    • Velocity

    • Zero offset

    Correct Answer
    A. Zero offset
    Explanation
    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.

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  • 31. 

    (415) Which couplant is authorized for use without specific engineering approval?

    • Gel

    • Glycerin

    • Silicones

    • Graphite greases

    Correct Answer
    A. Gel
    Explanation
    Gel is the authorized couplant for use without specific engineering approval.

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  • 32. 

    (417) Which data presentation displays signal amplitudes in various color schemes?

    • A-scan

    • B-scan

    • C-scan

    • D-scan

    Correct Answer
    A. C-scan
    Explanation
    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.

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  • 33. 

    (417) What ultrasonic technique inspects thin test parts when the dead zone prevents an inspection with another method?

    • Lamb

    • Pulse-echo

    • Angle-beam

    • Through-transmission

    Correct Answer
    A. Through-transmission
    Explanation
    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.

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  • 34. 

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

    • Laminate

    • Matrix

    • Cement

    • Bond line

    Correct Answer
    A. Matrix
    Explanation
    A matrix is an adhesive that bonds fibers to each other and provides side-to-side support. It acts as a glue or binder that holds the fibers together, creating a strong and cohesive structure. The matrix material fills the spaces between the fibers, providing support and stability to the overall composite material. This allows for efficient load transfer and enhances the mechanical properties of the composite.

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  • 35. 

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

    • Bond testing

    • Shearography interferometry

    • Spray on foam insulation (SOFI) inspection

    • Composite over-wrap pressure vessels (COPV) inspection

    Correct Answer
    A. Shearography interferometry
    Explanation
    Shearography interferometry uses laser-based imaging to detect, measure, and analyze surface and subsurface irregularities in materials or structures. It is a non-destructive testing method that can identify defects such as delaminations, disbonds, and cracks. By using laser beams to create interference patterns on the surface of the material, shearography can accurately detect and quantify structural flaws. This technique is commonly used in industries such as aerospace, automotive, and manufacturing for quality control and inspection purposes.

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  • 36. 

    (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?

    • Absolute

    • Reflection

    • Differential

    • Driver/receiver

    Correct Answer
    A. Differential
    Explanation
    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.

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  • 37. 

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

    • Far field

    • Near field

    • Dead zone

    • Beam spread

    Correct Answer
    A. Near field
    Explanation
    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.

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  • 38. 

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

    • Intensity

    • Frequency

    • Amplitude

    • Attenuation

    Correct Answer
    A. Amplitude
    Explanation
    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.

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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?

    • 0300-3-7075

    • 7075-3-0003

    • 0003-3-7075

    • 7075-3-0300

    Correct Answer
    A. 7075-3-0300
    Explanation
    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.

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  • 40. 

    (417) Which inspection technique will you use when inspecting around fastener holes, cylindrical components, skins, and welds?

    • Lamb wave

    • Angle beam

    • Surface wave

    • Through-transmission

    Correct Answer
    A. Angle beam
    Explanation
    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.

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  • 41. 

    (419) According to TO 33B-1-2 Nondestructive Inspection General Procedures and Process Controls, when do you complete all ultrasonic process controls?

    • Weekly

    • Monthly

    • Quarterly

    • Semi-annually

    Correct Answer
    A. Quarterly
    Explanation
    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.

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  • 42. 

    (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?

    • Time base

    • Horizontal limit

    • Lower linearity limit

    • Upper linearity limit

    Correct Answer
    A. Horizontal limit
    Explanation
    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.

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  • 43. 

    (419) Which reference blocks are used for the system sensitivity check?

    • Distance-area blocks

    • Miniature angle beam block

    • International Institute of Welding (IIW) block

    • American Society of Testing and Materials (ASTM) Standard Reference Blocks

    Correct Answer
    A. American Society of Testing and Materials (ASTM) Standard Reference Blocks
    Explanation
    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.

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  • 44. 

    (419) Which type of frequency transducers are used for the back surface resolution control checks?

    • 1.0 MHz or above

    • 1.0 MHz or below

    • 2.25 MHz or above

    • 2.25 MHz or below

    Correct Answer
    A. 2.25 MHz or above
    Explanation
    Transducers with a frequency of 2.25 MHz or above are used for back surface resolution control checks. This means that the frequency of the transducer should be higher than 2.25 MHz in order to effectively perform the resolution control checks on the back surface.

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  • 45. 

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

    • Two

    • Four

    • Six

    • Eight

    Correct Answer
    A. Two
    Explanation
    The angle of new and used ultrasonic transducers should be maintained within two degrees of what is required to perform an ultrasonic inspection. This is important because any deviation beyond this range can result in inaccurate readings and potentially compromise the effectiveness of the inspection. By ensuring that the angle is within two degrees of the required angle, the transducers can accurately transmit and receive ultrasonic waves, allowing for reliable and precise inspections.

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  • 46. 

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

    • Boron

    • Aramid

    • Carbon

    • Graphite

    Correct Answer
    A. Boron
    Explanation
    Boron fiber has high tensile and compression strength, meaning it can withstand a lot of force and pressure without breaking. It also lacks galvanic corrosion potential, which means it does not corrode when in contact with other metals. These properties make boron fiber popular for repairs because it can provide strength and durability while avoiding potential corrosion issues.

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  • 47. 

    (424) 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

    • Lasers

    • Cameras

    • Interferometer

    • Image-processing computer

    Correct Answer
    A. Cameras
    Explanation
    Shearography is a non-destructive testing technique that uses cameras to create images showing the first derivative of the out-of-plane deformation of a test part surface. The cameras capture the surface deformation caused by a change in load, and this information is processed by an image-processing computer to generate the shearogram images. Lasers are often used in conjunction with cameras and interferometers to provide the necessary illumination and interference patterns for shearography, but they are not directly responsible for creating the images themselves.

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  • 48. 

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

    • Holes and other defects

    • Scratches on the part surface

    • Signals from the bond-testing unit

    • Buckling or dents in the face or back sheet

    Correct Answer
    A. Buckling or dents in the face or back sheet
    Explanation
    Buckling or dents in the face or back sheet could indicate a delamination between sheets and core material in honeycomb panels. This is because delamination can cause the sheets and core material to separate, leading to deformation such as buckling or dents in the face or back sheet. These deformations are visible signs that the bond between the sheets and core material has been compromised.

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  • 49. 

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

    • Resonance

    • Pulse-echo

    • Tap testing

    • Through-transmission

    Correct Answer
    A. Tap testing
    Explanation
    Tap testing is a bond testing method that can detect voids 1 1/2 inch diameter or larger in metal-or-metal, composite-to-metal, or thin facing-sheet honeycomb assemblies. This method involves tapping or striking the surface of the assembly and listening for differences in the sound produced. If there is a void or a defect in the bond, it will produce a different sound compared to a solid bond. Therefore, tap testing is a suitable method for detecting larger voids in these types of assemblies.

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  • May 07, 2020
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