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Within a given material, the speed of sound:
Is constant Decreases with distance from the transducer Increases with distance from the transducer None of the above Some transducers are specifically fabricated to be:
Better transmitters Better receivers Used in high temperature applications All of the above In the transverse or shear wave, the particles:
Move in an elliptical pattern Oscillate at a right angle to the direction of wave propagation Oscillate parallel to the direction of wave propagation Do not actually move The terms used to describe a techniques ability to locate flaws are:
Sensitivity and penetration Space and time Sensitivity and resolution Frequency and size
Ultrasound is generally defined as sound at frequency above the threshold of human hearing, which is?
20,000 MHz 20,000 Hz 2 MHz 2 Hz A 6dB change in the measured ultrasonic signal strength indicates that the sound intensity changed by a factor of :
Six Two Twelve Sixty What is used to establish a general level of consistency in measurements, and to help interpret and quantify the information contained in the received signal?
Reference standards Industry standards Accuracy standards Modeling standards Artificial flaws can be produced by using:
Side drilled holes Flat bottom holes EDM notches All of the above In angle-beam testing, when the geometry of the part is relatively uncomplicated and the orientation of a flaw is well known, the length of a crack can be determined by a technique known as:
Tip diffraction Immersion Surface mode diffraction Contact testing
Snell's Law describes the relationship between the sound velocity and:
10 The refracted angle of the wave The reflected angle of the wave Both A and B None of the above The a large acoustic impedance mismatch at an interface will result in:
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A high amount of transmitted sound energy A small degree of refraction A large critical angle A high amount of reflected sound energy The sound energy or ultrasonic beam is more uniform in the:
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Far field zone Near field zone Interface between the transducer and plastic wedge Band along the central axis Which material properties affect the speed of sound within a material?
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Density and specific gravity Atomic mass and density Density and elastic properties Acoustic impedance and atomic mass What part of the ultrasonic machine generates short, large-amplitude pulses of controlled energy?
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Pulser Amplifier Transducer Scanner Which type of transducer can be used to scan wide areas when high sensitivity is not required?
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Mosaic transducer Single crystal transducer of small diameter Composite transducer Paint brush transducer
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The act of evaluating and adjusting the precision and accuracy of the measurement equipment is called:
Standardization Calibration Accuracy Tuning The material of the reference standard used to setup for a flaw inspection:
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Can be made from similar material as long as the velocity is the same Should be the same material being inspected Must have the same impedance values as the base material Can only be used once Which type of screen presentation displays the amount of received ultrasonic energy as a function of time?
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A-scan B-scan C-scan All of the above The measure of how a signal from a defect compared to other background reflections is called:
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Acoustic impedance Signal to noise ratio Refraction Reflection Immersion transducers have:
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An acoustical impedance matching layer A large angle of refraction A small angle of refraction A large angle of reflection
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