ASNT LEVELIII-UT 기출문제 자료




1. To determine disbond in laminar composite materials with immersion techniques, the most appropriate transducer for an initial trial would be ; D




A. focused B. flat C. angle beam D. paint-brush




2. During a ultrasonic testing the contact through transmission technique, there is a significant signal loss, which of the following should be done when the signal loss is noticed?




A. check sensitivity setting of the ultrasonic testing instrument(measurement)

B. check couplant and apply more couplant if necessary

C. change transducer type and frequency

D. reinspect immediately with pulse echo

E. record and report indications and continue testing




3. Crack tip signal would most easily be detected with 45° shear wavein which of the following crack type found in pope welding?




A. Multiple cracks running in random directions

B. A single crack normal to the 45° sound beam

C. A single crack normal to the I.D. surface

D. Lamellar tearing

E. B and C




4. In contact manual pulse echo UT, the width of the initial pulse may vary from the Cal. block to the test surface due to? B




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

E. none of the above




5. which of the following factors cause the variations in acoustic pressure which occur whthin the Fresnel Zone?




A. Harmonic resonance of the transducer

B. interference patterns between oscillations whth in the wave trains

C. Beam spread in the Fraunhofer zone

D. sound travelling from multiple points on the transducer's surface

E. B and D

6. Compact, digital-display measurement instrument depend on which on which of the following for their operating principle?




A. pulse-echo B. through-transmission C. resonance D. immersion




7. Hysteresys in an immersion "C"-scan recording is primacy caused by? A




A. bridge system electronics

B. bridge system mechanics

C. ultrasonic set electronics

D. water path




8. bonded joint inspection 가능한 것 모두 고르시오. 문제에서는 한두개 빠지고 숫자로 고르는 문제 였슴




A. resonance B. through-transmission C. pulse-echo D. multiple reflection

E. acoustic impedance




9. 탐촉자 고를 때 최적조건 ? A




A. resolution and penetration B. contact and immersion

C. size and shape D. 횡파 and 종파 E. focal length and water path




10. 다음 중 물에서 감쇠 증가 영향 ? E




A. 물에 공기량 증가 B. 물온도 증가 C. 물온도 감소 D. 물의 염분 감소 E. A and B




11. plus or minus manual tolerance, ultrasonic thickness measurement using only an A-scan anolog display is ?




A. ±2% of full screen B ±5% of full screen

C. ±10% of full screen D ±20% of full screen