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45 Cards in this Set
- Front
- Back
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Which of the following would be considered of Ultrasonics techniques?
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determination of a materials elastic modules
measurement of material thickness study of metallurgic structure |
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The acoustic impedance of a material is used to?
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Determine relative amounts of sound energy coupled through and reflected at an interface
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When angle beam contact testing a test piece, increasing the incident angle until the second critical angle is reached results in?
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Production of surface waves
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The crystal thickness and transducer are related. The thinner the crystal the...
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Higher the frequency
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The random crystallographic direction in alloys with large crystalline structure is a factor determining...
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Acoustice noise level
Selection of test frequency Scatering of sound |
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The difference in signals recieved from identical reflectors at different material distances from a transducer may be caused by...
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Matterial attenuation
Beam divergence Near-field objects |
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In figure 1 shown below, assuming beam patterm, what relationship would you expect to exist between the amplitude of the reflected laminar signals at A and B
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2:1 ratio
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In the far field of uniform, ultrasonic beam sound intensity is (______)at the center line
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Maximum
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Which of the following may result in a long narrow rod if the beam divergence results in a reflection from a side of the test piece before the sound wave reaches the back surface?
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Mutiple indications before the back reflection
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Where does beam divergence occur?
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Far field
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As the frequency increases in ultrasonic testing, the angle of beam divergence of a given diameter...
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Decreases
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Figure 2 illustrates a contact test onna 8inch aluminum block. A discontinuity is located 6 inches from the surface. The screem representation for this is shown to the right. What does indication (D) represent?
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First discontinuity indication
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The ultrasonic test method shown in figure 1 is...
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Compressional waves
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The ratio of the velocity of sound in water compared to that of aluminum or steel is approximately...
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1:4 ratio
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Using the imersion method,a distance amplitude curve (DAC) for 3/4inch diameter 5MHZ search unit shows the high point of the DAC curve at the 1/2inch. One day later the high point of the DAC for the seatch unit is at the 3/4inch. Assuming calibration has not changed, this would indicate that search unit..
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Has the beam of a smaller search unit
Is becoming defective |
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On an A-scan display, what represents the intensity of a reflected beam?
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The horizontal screen location
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Which best describes a typical display of a crack whose major surface is perpendicular to the ultrasonic beam?
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A sharp indication
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The primary purpose for a reference standard block is...
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To provide a guide for adjusting instrument controls to reveal discontinuity that are considered harmful to the end use of that product
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Compensation for the variation echo height related to the variations in discontinuity depth in the test materials is known as your...
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Distance Amplitude Correction (DAC)
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Which of the following reference reflector that is not dependant on the beam to the plate surface and perpendicular to the sound?
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A side drill hole which is parallel
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Using a pulse echo technique, if the major plane of a flat discontinuity oriented at some angle other than perpendicular to the direction of soumd propagation the resut may be because of...
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loss or lack of recieved discontinuity echo
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As a transducer diameter decreases, the beam spread...
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increases
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A set of standard reference blocks with the same geometric configuration and dimensions other than the size of the calibration reflector flat bottom holes is called a set of...
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Area and Amplitude standard reference blocks
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Which of the following controls the voltage supplied to the vertical deflection plates of the CRT in an A-scan UT setup?
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Amplifier Circuit
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Attenuation is a difficult quantity to measure accurately, particularly at the solid materials, at the test frequency normally used. The overall results usually observed include other loss mechanisms which can include...
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Beam spread
Couplant mismatch Test piece geometry |
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The vertical linear range of a test instrument may be determined by obtaining ultrasonic responses from...
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A set of area amplitude blocks
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Large grains in a metallic test specimen will usually result in...
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Decrease; a loss of back surface reflections
Large hash or noise indications Decrease in penetrations |
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The total energy losses accuring in all material is called...
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Attenuation
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In figure 3 transducer A is being used to establish...
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The exit point
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In figure 3 transducer C is being used to check...
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Sensitivity calibration
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In figure 4, the calibration block shown is a or an (______) block
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DSC block
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In the blocks shown in figure 5 the block can be used to...
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Perform Longitudinal wave distance calibration
Perform Shear wave distance calibration Determine wedge angle |
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In figure 6 what is the calibration block type?
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IIW block
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The angle at which 90 degree refraction of the shear wave mode occurs is called...
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The second critical angle
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The electronic circuitry that allows selection of the shear wave mode occurs is called...
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An electronic gate
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In the block shown in figure 7 the purpose of this block is to establish sensitivity for weld inspections?
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False
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In ultrasonic testing, the time duration of the transmitted pulse is referred to as...
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A pulse length
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In an ultrasonic instrument, the number of pulses produced by an instrument in a given period of time is...
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The pulse repetition rate
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In a base pulse-echo instrument, the componet that produces the voltage that activates the search unit is called...
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The pulser
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Which of the following is not an adavantage of contact ultrasonic search unit (probes) adapted with lucite shoes?
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Increases sensitivity X
Allows the ultrasound to enter a parts surface at oblique angles O Eliminates most of the crystal wear O Permits adapation to curved surfaces O |
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In which medium would velocity be the lowest?
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Air O
Water X Aluminum X Stainless Steel X |
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In steel the velocity of sound is greatest in which of the following mode of vibration?
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Longitudinal
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A diagram in which the entire circuit stage or sections are shown by geometric figures and the path of signal or energy by lines and/or arrow is called a...
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Block diagram
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The block set are shown in figure 8 is an (______) block set and is used for (_____) calibration?
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Alcoa, distance amplitude
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The designation 4340-5-0300 means...
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4340 steel, 5/64 inch diameter reflector, 3 inch to the reflector
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