Term
| Some transducers are specifically fabricated to be: |
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Definition
Better transmitters
Better receivers
Used in high temperature applications |
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Term
| The material of the reference standard used to setup for a flaw inspection: |
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Definition
| Should be the same material being inspected |
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Term
| Surface or Rayleigh waves travelling along the surface of relative thick solid material, penetrate to a depth of approximately: |
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Definition
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Term
| Resolution generally increases: |
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Definition
With an increase in transducer frequency |
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Term
| The act of evaluating and adjusting the precision and accuracy of the measurement equipment is called: |
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Definition
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Term
| Which type of calibration block is used to determine the resolution of angle beam transducers per requirements of AWS and AASHTO? |
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Definition
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Term
| Acoustic impedance is identified by the letter: |
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Definition
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Term
| Which type of transducer can be used to scan wide areas when high sensitivity is not required? |
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Definition
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Term
The a large acoustic impedance mismatch at an interface will result in: |
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Definition
A high amount of reflected sound energy |
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Term
| Which type of screen presentation displays a plan-type view of the location and size of the test specimen features? |
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Definition
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Term
Which of the following could influence the behavior of a transducer? |
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Definition
Electrical construction
Material construction
Mechanical construction |
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Term
| What is the material called that is used to improve the transmission of ultrasonic sound energy from the transducer into the part? |
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Definition
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Term
| The purpose of the backing material in a transducer is to: |
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Definition
| Control the ringing of the active element |
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Term
| What Greek letter is used to represent wavelength? |
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Definition
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Term
| Contact transducers are used for direct contact inspections, and are generally: |
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Definition
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Term
| The frequency marked on a transducer indicates: |
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Definition
| The center frequency at which the transducer operates |
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Term
| In the transverse or shear wave, the particles: |
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Definition
| Oscillate at a right angle to the direction of wave propagation |
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Term
| The sound that emanates from a piezoelectric transducer originates: |
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Definition
| From most of the active surface |
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Term
| What is the correct formula for calculating the wavelength when the wave velocity and frequency are known? |
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Definition
| Wavelength = Velocity / Frequency |
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Term
| The active element of most acoustic transducers used today is: |
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Definition
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Term
| Couplant displaces the__________ and makes it possible to get more sound energy into the test specimen. |
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Definition
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Term
| The terms used to describe a technique's ability to locate flaws are: |
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Definition
| Sensitivity and resolution |
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Term
| Shear waves do not propagate in: |
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Definition
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Term
| When sound travels through a medium: |
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Definition
Its intensity diminishes with distance
It spreads perpendicular to the primary direction of wave travel
Its speed remains constant |
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Term
| A calibration block produced by the International Institute of Welding is called: |
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Definition
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Term
Which of the following waves is only able to travel through a thin section of material? |
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Definition
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Term
| Less damped transducers will exhibit: |
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Definition
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Term
| Snell's Law describes the relationship between the sound velocity and |
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Definition
The refracted angle of the wave
The reflected angle of the wave |
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Term
| The area in front of a transducer where there are extensive fluctuations in the sound field is called the: |
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Definition
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Term
| Ultrasound is generally defined as sound at frequency above the threshold of human hearing, which is? |
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Definition
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Term
| The number of cycles per second is the definition of: |
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Definition
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Term
| In order to have a reasonable chance at detecting a discontinuity, the reflective surface of the discontinuity must have a dimension that is at least as long as ________ wavelength. |
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Definition
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Term
| When a longitudinal wave encounters an interface between two material with different acoustic impedances, what occurs when the angle of incidence is 90 degrees? |
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Definition
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Term
| When performing a contact inspection on a curved surface, what pieced of equipment can be used to improve coupling? |
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Definition
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Term
| What type of transducer contains two independently operating elements in a single housing? |
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Definition
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Term
| When a single element transducer is operating in the pulse echo mode, the element: |
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Definition
Cannot start receiving reflected signals until the element has stopped ringing from its transmit function |
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Term
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Definition
Longitudinal waves
Shear waves
Surface waves |
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Term
| When a wave encounters an interface at an oblique angle, what takes place at the interface due to the different sound velocities of the two materials? |
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Definition
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Term
| The measure of how a signal from a defect compared to other background reflections is called: |
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Definition
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Term
| The ability to locate a small discontinuity is called: |
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Definition
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Term
| Which of the following would make a good couplant? |
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Definition
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Term
| What part of the ultrasonic machine generates short, large-amplitude pulses of controlled energy? |
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Definition
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Term
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Definition
| Distance Amplitude Correction |
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Term
| Which type of screen presentation displays the amount of received ultrasonic energy as a function of time? |
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Definition
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Term
| Which type of screen presentation displays a profile or cross-sectional view of the test specimen? |
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Definition
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Term
| The ability to locate discontinuities that are close together within the material is called: |
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Definition
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Term
| A 6dB change in the measured ultrasonic signal strength indicates that the sound intensity changed by a factor of: |
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Definition
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Term
| Within a given material, the speed of sound: |
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Definition
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Term
| Which type of calibration block closely resembles the miniature angle-beam block and is used in a similar way? |
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Definition
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Term
| What type of set-up can provide information about both the size of the flaw and distance between the flaw and the transducer? |
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Definition
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