UT Level I Questions.doc

UT Level I Questions 1. The indication on the cathode ray tube (CRT) (CRT) which represents the far far boundary of The aterial bein! tested is called" a. #ash  b. The initial pause c. The ain ban! d. The bac$ surface reflection reflection %. In iersion testin!& the position of the search unit is often varied to transit sound into the test part at various an!les to the the front surface. 'uch a procedure is referred to as" a. n!ulation  b. ispersion c. Reflection testin! d. Refraction *. The cable that connects the ultrasonic ultrasonic instruent to the the search unit is specially specially desi!ned so that one conductor is centered inside inside another. The technical nae for such a cable is" a. +, cable  b. Conduit c. Coa-ial cable d. Ultrasonic conductor cable!rade %/ 0. a.  b. c. d.

The process of coparin! coparin! an instruent or device to a standard is called" n!ulation Calibration ttenuation Correlation

. a.  b. c. d.

nother nae for a copressional copressional wave is" Lab wave 'hear wave Lon!itudinal wave Transverse Transverse wave

2. nother nae for Raylei!h waves is" a. 'hear waves  b. Lon!itudinal waves c. Transverse waves d. 'urface waves 3.  aterial used between the face of a search unit and the test surface to perit the transission of ultrasonic vibrations fro the search unit to the aterial bein! tested is called" a.  wettin! a!ent  b.  couplant c. n acoustic transitter  transitter  d.  lubricant lubrica nt

4. The pie5oelectric aterial in a search unit which vibrates vibrates to produce ultrasonic waves is is called a" a. +ac$in! aterial  b. Lucite wed!e c. Crystal d. Couplant 6. Ultrasonic testin! of aterial where the search unit is in direct contact with the aterial bein! tested ay be" a. 'trai!ht bea testin!  b. 'urface wave testin! c. n!le bea testin! testin! d. ll of the above 1/. n advanta!e of usin! lithiu lithiu sulfate in search search units is that it" a. Is one of the ost ost efficient !enerators !enerators of ultrasonic ener!y  b. Is one of the ost efficient receivers of ultrasonic ultrasonic ener!y c. Is insoluble d. Can withstand teperatures teperatures as hi!h as 3//7C (1&%2/7 8) 11. The search unit shown in in 8i!ure 1 is used for" for" a. 'urface wave testin!  b. n!le bea testin! c. Iersion testin! d. 'trai!ht bea testin! testin! 1%. 9hich of the followin! followin! search units would contain the the thinnest :uart5 crystal; crystal; a.  1 one of the above */.  screen pattern containin! a lar!e nuber of lowlevel indications (often referred to as DhashE) could be caused by" a.  crac$   b.  lar!e inclusion c. Coarse!rained aterial d.  !as poc$et

*1.  test ethod eployin! two separate search units on opposite surfaces of the aterial  bein! tested is called" a. Contact testin!  b. 'urface wave testin! c. Throu!htransission testin! d. Lab wave testin! *%. The nuber of coplete waves which pass throu!h a !iven point in a !iven period of tie (usually 1 s.) is referred to as the" a. plitude of a wave otion  b. =ulse len!th of a wave otion c. 8re:uency of a wave otion d. 9avelen!th of a wave otion **. The boundary between two different aterials which are in contact with each other is called" a.  rarefactor   b.  refractor  c. n interface d.  ar$er  *0. 9hen the otion of the particles of a ediu is parallel to the propa!ation& the wave bein! transitted is called a" a. Lon!itudinal wave  b. 'hear wave c. 'urface wave d. Lab wave *. 9hen the otion of the particles of a ediu is transverse to the direction of propa!ation& the wave bein! transitted is called a" a. Lon!itudinal wave  b. 'hear wave c. 'urface wave d. Lab wave *2. D% illion cycles per secondE can also be stated as" a. % $#5  b. %// $#5 c. % one of the above 0%. In 8i!ure 0& an!le % (G%) is called" a. The an!le of incidence  b. The an!le of reflection c. The an!le of refraction d. >one of the above 0*. In 8i!ure 0& an!le * (G*) is called" a. The an!le of incidence  b. The an!le of reflection c. The an!le of refraction d. >one of the above 00. one of the above 02. In an scan presentation& the aplitude of vertical indications on the screen represents the" a. ount of ultrasonic sound ener!y returnin! to the search unit  b. istance traveled by the search unit c. Thic$ness of aterial bein! tested d. @lapsed tie since the ultrasonic pulse was !enerated

03. 9hich of the followin! test fre:uencies would !enerally provide the best penetration in a */ c (1% in) thic$ specien of coarse!rained steel; a. 1 o. D1E bloc$ and sallest in the >o. D4E bloc$  d. rilled to different depths fro the front surface of the test bloc$  . In iersion testin!& verification that the search unit is noral to a flat entry surface is indicated by" a. ot related to the an!le of reflection 23. ?n any ultrasonic testin! instruents& an operator conductin! an iersion test can reove that portion of the screen presentation that represents water distance by adHustin! a" a. =ulse len!th control  b. ReHect control c. 'weep delay control d. 'weep len!th control 24. D1//&// cycles per secondE can be written" a. /.1 $#5  b. 1/ $#5 c. 1// $#5 d. 1// o chan!e in its velocity d.  reversal in its velocity

33. Ultrasonic waves transitted into and received fro the test aterial in the for of repetitive bursts of acoustic ener!y is called" a. =ulse echo testin!  b. Continuous wave testin! c. Resonance testin! d. >one of the above 34.