QUIZ) ASNT L3 UT 11

201. A point, line or surface of a vibrating body marked by absolute or relative freedom from vibratory

motion is referred to as

A. a node

B. a finger

C. length

D. depth

202. ultrasonic testing of castings usually requires

A. high frequency transducers

B. lower frequency transducers

C. delay tip transducers

D. transducer bubbler system

203. A notch type reference standard for tubing should be machined on

a. both the inner and outer surface

b. the inner surface only

c. the outer surface only

d. the inner surface to a depth of 1/2 times the wall thickness

204. The lack of parallelism between the entry surface and the back surface

a. makes it difficult to locate discontinuities that lie parallel to the entry surface

b. may result in a screen pattern that does not contain back reflection indication

c. usually indicates a porous condition exists in the metal

d. will decrease the penetrating power of the test

205. A surface(rayleigh) wave travels at appropriate what percentage of the velocity of a longitudinal wave in

the same solid medium?

a. 5 % b. 45 % c. 90 % d. 131 %

206. All other factors being constant single amplitude for finite reflector (small than width of the sound beam)

is related to distances as?

a. a direct function b. an inverse function

c. an inverse square function d. a root mean square function

207. The wave front transmitted by an UT beyond the near zone is essentially a

a. plane wave front with almost no peaks or valleys

b. wave front with peaks or valleys that remain constant with distance traveled

c. wave front with peaks or valleys that vary with the distance wave travels

d. cylindrical wave front vibration along the direction of propagation

208. The most useful portion of an ultrasonic sound beam is?

a. at the near surface

b. at the end of the near field and beyond

c. at the end of the far field

d. depends on transducer frequency

209. In an ultrasonic test system where signal amplitudesare displayed on a CRT, an advantage of a frequency

independent attenuator over a continuously variable gain control is that

a. the pulse shape distortion is less

b. the signal amplitude measured using the attenuator is independent of frequency

c. the dynamic range of the system is decreased

d. the effect of amplification threshold Is avoided

210. An amplifier in which received echo pulses must exceed a certain threshold voltage

before they can be indicated might be used to

a. suppress amplifier noise, unimportant scatter echoes. or small flaw echoes that are of no consequence

b. provide a screen display with nearly ideal vertical linearity characteristics

c. compensate for the unavoidable effects of material attenuation losses

d. provide distance amplitude correction automatically

211. The output voltage from a saturated amplifier is

a. 180° out of phase from the input voltage

b. lower than the Input voltage

c. non-linear with respect to the input voltage

d. below saturation

212. The transmitted pulse at the output of the pulser usually has a voltage of 100 to 1000V, whereas the

voltages of the echoes at the input of the amplifier are on the

a. 0.001-1 V

b. 1-5 V

c. 10 V

d. 50 V

213. The intended purpose o# the adjustable calibrated attenuator of an ultrasonic instruments is to

a. control transducer damping

b. increase the dynamic range of the instrument

c. broaden the frequency range

d. attenuate the voltage applied to the transducer

214. Which of the following might result in increased transmission of ultrasound with in a coarse-grained

material?

a. perform the examination with a smaller diameter transducer

b. perform the examination after a grain refining heat treatment

c. change from a contact examination to an immersion examination

d. change from a longitudinal to a transverse wave

215. When material grain size is on the order of ______________ wavelength of larger, excessive scattering

of the ultrasonic beam may affect test results

a. 1

b. 1/2

c. 1/10

d. 1/100

216. In a forging, flaws associated with nonmetallic inclusions can most accurately be described at having

which of the following orientations?

a. parallel to the major axis

b. parallel to the minor axis

c. aligned with forging flow lines

d. at approximately 45° to the forging direction

217. The preferred method of ultrasonically inspecting a complex-shaped forging

a. is an automated immersion test of the finished forging using an instrument containing a calibrated

attenuator in conjunction with a C-scan recorder

b. combines thorough inspection of the billet prior to forging with a careful inspection of the finished part

in all areas where the shape permits

c. is a manual contact test of the finished part

d. is an automated immersion test of the billet prior to forging

218. in a long rod that is examined from one end with a longitudinal beam, the most likely effect to

longitudinally-oriented discontinuities would be to

a. significantly reduce the back surface reflection

b. cause echoes between the initial pulse and the first back surface reflection for which the reflector

locations cannot be precisely determined

c. remove or reduce the amplitude of echoes from refracted beam paths

d. cause excessive baseline noise

219. When maximum sensitivity is required from a transducer

a. a straight beam unit should be used

b. large diameter crystals are required

c. the piezoelectric element should be driven at its fundamental resonant frequency

d. the band width of the transducer should be as large as possible

220. Which of the following 1 MHz search units should normally have the best time or distance resolution?

a. quartz transducer with air backing

b. quartz transducer with phenolic backing

c. barium titanate transducer with phenolic backing

d. lithium sulfate transducer with epoxy backing

 

 

 

answer

201	202	203	204	205	206	207	208	209	210
A	B	A	B	B	C	D	D	B	A
211	212	213	214	215	216	217	218	219	220
C	A	B	B	C	C	B	C	C	D