QUIZ) ASNT L3 UT 10

181. For a longitudinal immersion test, an automatic scanner is set to scan at 50cm/sec with a pulse

repetition rate of 500 pulses per second and the water path is 25cm over an aluminum plate.

Assuming an effective beam diameter of 0.220cm at the depth of the flaw, on the average how many

effective interrogation would be made during one scan over a flaw equivalent to a flat-bottomed hole

0.0397cm in diameter?

A. 1.5 B. 2.2 C. 4.4 D. greater than 5

182. A remote testing application using air couplied ultrasonic that would be more practical than using

conventional ultrasonic method is

A. testing composites for thickness

B. testing thin sheet for thickness at elevated temperatures

C. testing wood composites for determinations

D. testing ball bearings for roundness

183. A back echo gate is required to be set during the calibration of ultrasonic equipment for an automated

immersion, longitudinal beam inspection of the plate, The function of the back echo gate for this

calibration is to alarm on _______________________

A. an increase in the back echo signal due to changes in perpendicularity and/or water path

B. a drop in the back echo signal due to lack of perpendicularity or excessive

C. the absence of a back echo signal due to the change in water path

D. a drop in the back echo signal to provide a base line (back reflection amplitude)

for the C-scan data generated by the system directonics

184. Which of the following methods of flaw sizing are capable of accurately measuring the plane

flaw size of 10 I.D cracks?

A. flaw tip diffraction method

B. decibel drop mothod

C. high angle shear wave

D. through transmission

185. The ultrasonic A-scan response from a composite tubing discontinuity gives the appearance of

reflections original at the tubing surface over the discontinuity. The difference between the discontinuity

reflection and the front surface reflection depends on the depth of the discontinuity. The discontinuity

would be classified as

A. a resin starved layer

B. a lack of roving

C. concealed cut

D. impact damage

186. The amplitude of an acoustic signal is expressed in

A. Hertz B. decibels C. radians D. newtons

187. A 2 inch steel plate with a smooth shiny surface is being tested by a longitudinal ultrasonic beam.

An indication is found that appears between the front surface and back surface reflections. This

indication remains uniform in shape and magnitude when the transducer is moved around the edge of

the plate. Which of the following is the most plausible explanation for this indication?

A. The indication is form a lamination extending around the perimeter of the plate

B. the ultrasonic instruments pulse repetition rate is set too high causing a false indication

C. the indication is form the plate corner caused by the transducers beam spread

D. surface waves are being reflected from the edge, causing a false indication

188. In contact manual pulse echo ultrasonic testing. The width of the initial pulse may vary from the

calibration block to the test surface due to

A. increased damping efficiency of the transducer

B. the use of thick couplant layers or the presence of rough entry surfaces

C. decreasing of the pulse duration

D. the use of lower pulse frequencies

189. For immersion ultrasonic testing, precision steel balls are used as target reflects for measuring certain

inspection system characteristics. Which of the characteristics below is not measured by using

precision steel balls?

A. beam symmetry

B. transducer operating frequency

C. horizontal limit

D. focal distance in water

190. The use of projected distance in calibration for shear wave inspection permits the operator to

A. calibrate in unite of length of the actual sound path

B. calibrate in unite of part thickness

C. calibrate in units of length related to surface of specimen

D. calibrate without the use of a known thickness standard

191. The calibration standard for pipe and tubular products should contain two longitudinal notches

(one on the inside surface and one on the outside surface) and two circumferential notches(one on the

inside surface and one on the outside surface) Unless otherwise specified. The notches should have

a maximum depth of

A. 3 percent of the nominal wall thickness or 0.1mm, whichever is greater

B. 5 percent of the nominal wall thickness or 0.1mm, whichever is greater

C. 6 percent of the nominal wall thickness or 0.2mm, whichever is greater

D. 10 percent of the nominal wall thickness or 0.2mm, whichever is greater

192. A decreased of 2 degrees in a plexiglass wedge will change a 45 degree show wave angle in steel

by appropriately

A. 4 degrees

B. 3 degrees

C. 6 degrees

D. 8 degrees

193. Frequency specified in cycles unit time in non-S1 units can also be expressed in Sl units

A. decibels

B. lux

C. Hertz

D. ~~~~~

194. It the angle of incidence during the performance of an immersion test of a type 410 stainless steel

plate was found to be 33 degrees, which mode(s) would exist in the plate?

A. Longitudinal wave

B. Shear wave

C. Surface (Rayleigh) wave

D. Creeping wave

195. During a shear wave test on an aluminum weld it was carefully determined that the response time

from a discontinuity was equal to 5.25 microseconds. What is the metal travel distance to the defect?

A. 1.02 cm

B. 1.63 cm

C. 16.6 cm

D. 24.4 cm

196. During a test using A-scan equipment strong vertical indications that move at varying rates across the

screen in the horizontal direction appear. lt is impossible to repeat a particular screen pattern by scanning

the same area. A possible cause of these indications is

A. porosity in the test part

B. an irregularly-shaped crack

C. a large grain structure

D. electrical interference

197. Focused transducers are especially useful in performing ultrasonic testing on

A. tick sections of material

B. complex configurations

C. porous materials

D. high resolution examinations

198. Forging of irregular shape can be given a practically complete inspection including fillet areas by

A. ultrasonic contact testing

B. ultrasonic immersion testing

C. ultrasonic resonance testing

D. ultrasonic through-transmission testing

199. Difficulties may be encountered when a "C" scan is made during a shear wave immersion test because

A. the velocity shift from longitudinal to shear wave makes calibration uncertain

B. slow velocity of the shear wave requires slow scan rates

C. interface synchronization may not be possible for grating

D. focusing is distorted due toe the incident angle

200. When testing composite materials, one factor to consider when designing a test is the attenuation

factor of the material, In metal matrix composites, the attenuation of the materials is generally

A. much higher than base metals

B. much higher than organic composites

C. between that of fiber composites and refractory composites

D. between that of base metals and organic composite

 

 

 

answer

181	182	183	184	185	186	187	188	189	190
B	C	C	A	A	B	C	B	B	A
191	192	193	194	195	196	197	198	199	200
B	D	C	D	C	D	D	B	A	D