QUIZ) ASNT L3 UT 12

221. The sensitivity of an ultrasonic test system

a. depends on the search unit, pulser, and amplifier used

b. decreases as the frequency is increased

c. increases as the resolution increases

d. Is not related to mechanical damping or the transducer

222. The ability of a test system to separate the front-surface echo and the echo from a small discontinuity

just below the surface

a. depends primarily upon the pulselength generated from the instrument

b. is not related to the surface roughness of the part under inspection

c. is primarily related to the thickness of the part under inspection

d. is usually improved by using a larger diameter search unit

223. Search unit sensitivity is most often determined by

a. calculations based on frequency and thickness of piezoelectric element

b. the amplitude of the response from an artificial discontinuity

c. comparing it to a similar search unit made by the same manufacturer

d. determining the rinsing time of search unit

224. Notches are frequently used as reference reflectors for

a. distance amplitude calibration for shear waves

b. area amplitude calibration

c. thickness calibration of plate

d. determining near-surface solutions

225. Notches provide good reference discontinuities when UT examination Is conducted to primarily

defects such as

a. porosity in rolled plate

b. inadequate penetration at the root of a weld

c. weld porosity

d. internal inclusions

226. The difference between a compression and shear wave is

a. quantitative measure

b. particle direction

c. qualitative measure

d. amplitude

227. The particle motion for Rayleigh waves is usually described as

a. sinusoidal

b. circular

c. elliptical

d. shear

228. Based upon wave theory and ignoring attenuation losses, the echo amplitude is

a. directly proportional to the distance to the reflector

b. inversely proportional to the distance to the reflector

c. directly proportional to the square of the distance to the reflector

d. inversely proportional to the square of the distance from the reflector

229. The rate generator In B-scan equipment will invariably be directly connected to the

a. CRT Intensity circuit

b. pulser circuit

c. RF amplifier circuit

d. horizontal sweep circuit

230. In A-scan equipment, the RF pulser output voltage is normally in the range of

a. 1-10 V

b. 10-100 V

c. 100-1000 V

d. 1000-3000 V

231. When contact testing. an increase In tightness of a shrink fit to a hollow shaft will cause the ratio

of the back reflection to the metal-to-metal interface reflection to

a. increase

b. decrease

c. remain unchanged

d. cannot be predicted as the response is material-dependent

232. During the Inspection of a parallel-sided, machined forging using the straight beam immersion technique

a diminished back reflection in a localized area in the absence of a defect indication would least

likely represent

a. a coarse grain structure

b. small nonmetallic stringers

c. a defect oriented at a severe angle to the entry surface

d. a large Inclusion

233. As you increase the frequency of a given size transducer

a. the lateral resolution is impaired

b. the beam divergence increases

c. the length of the near field increases

d. the sensitivity increases

234. Which frequency ran best distinguish the difference between a large planar defect and 4 stacked

(multiple-layered) laminations in rolled plate?

a. 0.5 MHz

b. 1 MHz

c. 2.25 MHz

d. 5 MHz

235. During immersion examination. when evaluating the response from a contoured surface of a part

irrelevant indications due to the contour are most likely to appear as

a. sharp spiked signal Indications

b. irregular signal indications

c. broad-based signal Indications

d. hash

236. The pulse applied to the electrodes of the ultrasonic search unit is

a. electrical

b. mechanical

c. electro-mechanical

d. piezoelectrical

237. In calibrating at ultrasonic test instrument utilizing the responses from each of the area amplitude

type reference blocks, the determination of the

a. vertical range is obtained

b. Pulse range is obtained

c. resolving range is obtained

d. horizontal range is obtained

238. Test sensitivity corrections for metal distance and discontinuity area responses are accomplished by using

a. an area amplitude set of blocks

b. an area amplitude and a distance amplitude set of blocks

c. a distance amplitude set of blocks

d. steel balls of varying diameter

239. The time from the start of the ultrasonic pulse until the reverberations completely decay limits the

maximum usable

a. pulse time-flaw rate

b. pulser/receiver rate

c. pulse repetition rate

d. modified pulse-time rate

240. Rough surfaces can cause undesirable effects which are noticeable when parts are tested ultrasonically

including

a. annular maxima rings

b. an increase in the width of front face echo and consequent loss of resolving power

c. acoustical mismatch

d. asymmetrical modes

 

 

 

 

answer

221	222	223	224	225	226	227	228	229	230
A	A	B	A	B	B	C	D	B	A
231	232	233	234	235	236	237	238	239	240
A	D	C	D	C	A	A	B	C	B