best 2001 2:21 10:43:12 uestion 1 [fa 5.0 MHz transducer is substituted for a 2.25 MHz transducer, what would be the effect on the wavelength of a longitudinal mode wave produced in the (est specimen? \ The wavelength would be longer B. ‘The wavelength would rema ©. The wavelength would be shorter 1 The wavelength would vary directly with the acoustic impedance tan. Question 2 IW the velocity of a longitudinal mode wave in a given | ogeneous material is .625 em/micro sec. at 1/2 inch below the Surface. what is the velocity at 2 inches below the surface? \ bo the velocity at 1/2 inch. B_ 1/2 the velocity at 1/2 inch. © The same as the velocity at 1/2 inch 1) None of the above Question 3 ‘What can cause irrelevant indications on the cathode ray tube? A. Contoured surfaces ©. Surface conditions D, All of the above Question 4 In a material with a given velocity, when frequency is increased, the wavelength will \. Not be effected Bo Increase Decrease DB DoubleQuestion 5. \ second name for Rayleigh waves A. Shear waves B Longitudinal waves Transverse waves: > Surtave waves Question 0. Which component in an ultrasonic immersion system is used to adjust and maintain a known transducer angle? A. A carriage BA manipulator \ search tube >. Am index system Question The piezoelectric material in a search unit whieh vibrates t0 produce ultrasonic waves is called: A.A backing material BA lucite wed ©. A transducer element or erystal DA-couplant Question 8 The cable that connects the ultrasonic instrument to the search unit is specially designed so that one conductor is centered inside another ‘The technical name for such a eable is \ BX cable Conduit ©. Coaxial cable D- Ultrasonic conductor cab grade 20 Question 9. Which of the follows crystal” 2 search units would contain the thickest AA | megahertz search unit 8 megahertz search unit megahertz search unit megahertz search unit.Question 10. An ultrasonic test using a straight beam contact search unit »s being conducted through the thickness of a flat part such as a plate This test should detect \Laminar-type flaws with major dimensions parallel to the rolled surface. 13 Transverse-lype flaws with major dimensions at right angles to the rolled surface © Radial flaws with major dimensions along length, but radially oriented to the rolled surface 1D None of the above Question Which of the following test frequencies would generally provide the best penetration in a 12-inch thick specimen of coarse- grained steel” \ 10 My B 2.25 MHz © 5.0 MHz b 0 Miz Question 12 (On the ares-amplitude ultrasonic standard test blocks, the Hat bottomed holes in the blocks are: \ All of the same diameter 1. Different in diameter, increasing by 1/64-inch increments from the No. "L" block to the No. "8" block. © Largest in the No. "1" block and smallest in the No, "8" block. Drilled to different depths from the front surface of the rest block Question 13 An advantage of using lithium sulfate in search units it that \ [Lis one of the most efficient generators of ultrasonic B. It is one of the most efficient receivers of ultrasonic wneres © Teas insoluble 1 Iccan withstand temperatures as high as 700 degreesQuestion Phe interference field near the face of a transducer is often referred as the \. Bresnel zone 1 Acoustic impedance © Exponential field. ing zone Question 13 \ term used to describe the ability of an ultrasonic testing, system to distinguish between the entry surface response and the response of discontinuities near the entry surface is A. Sensitivity 8 Penetration ©. Segregation Resolution Question Lo. \ Bescan display shows the relative \. Distance « discontinuity is from the tar through- dimension thickness. 8 Distance « discontinuity is from the transducer and its length in the direction of transducer travel © Cross-sectional area of a discontinuity above a predetermined amplitude D_ None of the above Question Entry surface resolution is a characteristic of an ultrasonic. vesting system which defines its ability to: \. Detwet discontinuities oriented in a direction parallel to the ultrasonic beam. 8. Detect discontinuities located in the center of a forging containing a fine metallurgie structure ©. Detect minute surface seratches: 1. Detect discontinuities located just beneath the entry surface in the part being tested.Question 18) Phe formula naterial is called jon within a -d to calculate the angle of refra \. bresnel’s haw &. Fraunhoter’s law ©. Snell's law Do Lamb's kaw question 1. When inspecting coarse-grained material. which of the tollowing frequencies will generate a sound wave that will be most casily scattered by the grain structure? \ 0 MH B 2.25 Mil ©. 3 MHz 1 MHz (Question 20. The velocity oF sound waves is pri warily dependent on: \ “The pulse length B. The frequency ©. The material in which the sound is being transmitted and the mode of vibration 1D None of the above Question 21 \ type of data presentation most likely to be used with a high speed automatic scanning system is: An A-scan presentation. A velocity versus amplitude plot © A C-sean presentation 1A plot of echo height versus depthQuestion 22 h) waves traveling on the top face of a block \. Are not reflected from a sharp edge corner. 13 Are reflected from a sharp edge corner. ©. Travel through the sharp edge corner and are reflected trom the lower edge. Are absorhed by a sharp corner (Question 23 The amount of beam divergence from a dependent on the \. Type of west B. Tightness of crystal backing in the search unit © Prequeney and erystal size 1. Pulse length Question 4 When contact testing, iff the ultrasonic instrument is set with an excessively high pulse repetition rate, which of the following may oveur? \ The serven trace will become too light to see, 1 The time-base line will become distorted. ©. The initial pulse will disappear. D. Ghost or “phantom” indications will appear on sereen during sean (Question 25 Sound can be focused by means of special curved adapter located in front of the transducer element. These adapters are referred t ay 4 Setubbers 15 Acoustic lenses © “Angle beam adapters wle plane adaptersQuestion 26 As the grain size increases ina material. its principal effect mi ultrasonic testing is on: \ the velocity of sound, 8 The attenuation © The acoustic impedance > The amgle of refraction Question 2 Sound waves of a frequency beyond the hearing range of the human ear are referred to as ultrasonic waves or vibrations, and the term embraces all vibrational waves of frequency greater than approximately \. 20,000 hertz 8 2 megahertz 2 kilohert7 > 200 Kilohertz Question 28 “The process of comparing an instrument or device with a standard is called! A. Angulation 8 Calibration © Attenuation 2 Correlation Question 29 In ultrasonic testing. a liquid coupling medium between the crystal surface «ind the part surface is necessary because: \ Labrie surface # An air interface between the crystal surface and the part surface would almost completely reflect the ultrasonic vibrations The erystal will not vibrate if placed directly in contact with the surface of the part being inspected. 1b The liquid is necessary to complete the electrical circuit tn the search unit 11 iS required (© minimize wear on the crystalQuestion 30. “The houndary between two different materials which are in contact with each other is called: \ A raretacior BA retractor © An interface > A marker Question 31 When testin onthe surtac by the surface wave method, patches of oil or dirt may A. Block the progress of all sound 1 Attenuitte the sound. ©. Have no effect on the test 1. Cause both an attenuation of sound and indications on the screen Question 32 \ disadvantage of w anit is thi ng natural quartz crystals in a search \ Twill dissolve in wate 18. [tay the least effective generator of ultrasonic energy of all commonly used materials. ©. [vis mechanically and electrically unstable: 1) It easily loses it operating characteristics as it ages. Question 33 Which circuits mouify the return signal from the receiving vransducer into a form suitable for display on an oscilloscope or vther output device? \ Pulser 8 Receiver amplifier © Clock D SweepSuestion 4 Fhe pulser eureuit in an ultrasoni¢ instrument is used to: 1 sweep. 4. Control the horizontal and verti B Activate the transducer. ©. Control transducer timing between transmit and sweep. 1 Generate markers that appear on horizontal sweep. Question 85 in immersion testing, the position of the search unit is often varied to transmit sound into the test part at various angles to, she front surtace, Such a procedure is referred to as \. Angulation B Dispersion © Reflection testing 1. Retraction duestion 36 The velocity of surtace waves is approximately the in the same material velocity of shear waves \. Lwo times, 1 Four times © One-half DB. Nine-tenths (uestion 37 25 million cycles per second” can also be stated as: S kilohertz 000 kilohertz 25 megahertz 135 micronerts (Question 38. Which of the tollowi g has the longest Fresnel zone? yf 2aneh diameter 1,0 MHz. 12-inch diameter 2.25 MHz. 1/$-inch diameter 1,0 MHz 11 Janch diameter 2.0 MHz.Question 39. \ plan view display or recording of a part under examination s walled \ A C-sean display B An A-scan display An X-axis plot 1) A strip chart recording Suestion 40. The component ina conventional immersion system which spans he width of the immersion tank is called: \ An articulator HA bridge © A manipulator >A search tuhe «Question 41 An amplitude type \. Shear wave examinations, 13. Longitudinal wave examinations. © Automatic examinations. 1) Manual examinations, (Question 42 \ separate time base Line imposed on the viewi Some ultrasonic testing instruments that permits measurement of distances ty often referred 10 as \ An anitial pulse \ time/distance line A marker PD Phrowgh Ismnission testing Question 43 Which circuit coordina uistrument systen? s operation of the entire ultrasonic Damping 8. Receiver-amplitier Clock 1) Power supplyGuestion -H An advantage of using a cera sh mic transducer in search units is ¥ iL isone of the most efficient generators of ultrasonic ener [Lis one of the most efficient receivers of ultrasonic energy thas a very low mechanical impedance 1). Tecan withstand temperatures as high as 700 degrees celsius (Question 45 ‘On many ultrisonie testing instruments, an operator conduct an) immersion test can remove that portion of the screen presentation that represents water distance by adjusting a. Pulse length control 3 Reject control, Sweep delay control. ). Sweep length control Question 46. Which of the following search units would contain the thinnest quiets erystal? \ MHz seareh unit \ 5-MHZ search unit \ 15-MHz search unit 1) 25-MHZz search unit Quesuon 47 425 meyaherty search unit would most likely be used during y Staight beam contact testi 1 Immersion testing. Angle bean contact testing. Py Surface wave contact testing,weston 48 190,000 eyeles per second” can be written \. 10 kilohertz 1100 kiloherts © 100 MHz 1 0.1 Kilohertz (Question 49) Phe depth of « discontinuity cannot be determined when using, «Straight beam testing method 8 Through transmission testing method © Angle beam testing method 1). Immersion testing method ston 50. ashen the motion of the particles of a medium is parallel to the direction of propagation, the wave being transmitted is called a: \. Longitudinal wave 1 Shear wave © Surface wave D) Lamb wave humber of complete waves which pass a given point in a aiven period of time (usually one second) is referred (0 as the: \ Amplitude of a wave motion Pulse length of a wave motion Frequency of a wave motion Wavelensth of a wave motion Question 52 An A-scan CRT display which shows a signal both above and below he sweep line is ealled st 4 Video display & RE display © Audio display 1) Frequency modulated displayWuestion 53 The proper interpretation and evaluation of the presented detect signals are essential 10 any nondestructive test. A common method for the estimation of defect size is the use of a: \ Double tansducer test BK. Piezoelectric standard. © Mode conversion 1. Reference standard iuestion 54 Another name tor a compressional wave ts \ Lamb wave 1 Shear wave © Longitudinal wave 1 ‘Transverse wave Question 55 When an ultrasonic beam passes through the interface between two dissimilar materials at an angle, a new angle of sound travel takes place m the second material due to: 4. Attenuation 1 Rarefaction Compression 1D. Retraction ‘Question 56. All other Jactors beg equal, which of the following modes of ihration has the greatest velocity? Shear wave ss. Transverse wa © Surface wave Longitudinal waveQuestion 57 ‘When testing a plate. increasing the frequency of an ultrasonic longitudinal wave will result in: \ An increase in its velocity BV decrease im its velocity > in its velocity > reversal in its velocity Question 88 Under most circumstances, which of the following frequencies would result in the best resolving power? \ | megahertz Pulse lengthQuestion 07 \ ‘est method in which the parts to be inspected are placed in water bath or some other Tiquid couplant ts called \ Contact wsting 1 immersion testing, © Surtace wave testing 1) Through transmission tes ing Questinn 8. When a vertical indication has reached the maximum signal height which ean be displayed or viewed on the CRT of an ultrasonic wirument, the indication is said to have reached its: \ Distanee-amplitude height B Absorption level © Vertical level Limit to resolution Question 09 The gradual loss of sonic energy as the ultrasonic vibrations: navel through the material is referred 10 as: \. Reflection B Refraction © Reproducibility 2 Attenuation Question 70. What must he done to evaluate discontinuities that are oriented scan angle to the entry surface so that the sound beam will strike the plane of the discontinuity at right angles? wwe the Irequency id the surfacecquestion 71 Metal blocks which contain one or more drilled holes to simulate discontinuities are called: \ Serubbers Crystal cotlimators Single plane angulators > Relerence blocks. ‘question 72 When the motion of the particles of a medium is transverse to he direction of propagation, the wave being transmitted is called \ Longitudinal wave B. Shear wave Surtace wave Lab wave duestiont Whar type of ultrasonic examination uses wheel-type search units Hhat_chiminate the ase of a tank? \ Through transmission testing 8 Contact testin © Resonance tes » Immersion test uestion 74 Aatenuttion ts 3 \ Lest display characteristic Fest material parameter. Transducer characteristic. 1 Form of testi