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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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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."

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.

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.

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.

Gel is the authorized couplant for use without specific engineering approval.

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.

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.

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."

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.