Top 1000+ Solved Non Destructive Testing and Evaluation MCQ Questions Answer
Q. A A disadvantage of using a low frequency ultrasonic transducer is:
a. It provides better penetration in most materials
b. It provides poorer penetration in most materials
c. It provides a smaller beam angle and poorer resolving power
d. It provides a larger beam angle and poorer resolving power
Q. A A disadvantage of using a high frequency ultrasonic transducer is:
a. It provides a smaller beam angle and better resolving power
b. It provides a larger beam angle and poorer resolving power
c. It is scattered more by coarse grained material
d. It is scattered less by coarse grained material
Q. When a longitudinal wave sound beam passes through an acoustic interface at someangle other than zero degrees:
a. Surface waves are generated
b. Plate waves are generated
c. Reflection, refraction and mode conversion occur
d. The first critical angle is reached
Q. The angle of a refracted shear wave generated as a sound wave passes at an anglethrough an acoustic interface is depentant on:
a. The acoustic impedances of the materials on each side of the interface
b. The frequency of the incident sound wave
c. The wavelength of the incident sound wave
d. The hardness of the materials on each side of the interface
Q. The purpose of the couplant is to:
a. Match impedances between the transducer and test piece
b. Absorb stray reflectors
c. Clean the test piece so a more efficient test may be continued
d. Lock the ultrasonic scanner into place prior to testing
Q. When a sound beam is reflected:
a. The angle of reflection is found using Snell's law
b. The angle of reflection equals the angle of incidence
c. All the sound energy is reflected unless the acoustic impedanmce is zero
d. Beam spread is decreased
Q. The ability to detect echoes from small reflectors is called:
a. Resolution
b. Attenuation
c. Accuracy
d. Sensitivity
Q. The ability to separate echoes from reflectors close together in depth is called:
a. Resolution
b. Attenuation
c. Accuracy
d. Sensitivity
Q. Which of the following transducer materials is the most efficient receiver ofultrasonic energy?
a. Lead metaniobate
b. Quartz
c. Lithium sulfate
d. Barium titanate
Q. AA display which shows the initial pulse and the front surface echo superimposedwould be considered:
a. An immersion test
b. An A scan
c. A contact test
d. A B scan
Q. AA display which shows the initial pulse and the front surface echo with a fairly widespace between the two would be considered:
a. An immersion test
b. An A scan
c. A contact test
d. A B scan
Q. When conducting an immersion test, the water path distance must be controlled sothat:
a. Spurious signals are not created by surface waves on the test piece
b. The (water path distance)/(diameter) ratio does not result in asymmetric standing waves
c. The test piece discontinuity indications appear between the first front and first back surface echos
d. The second front surface echo does not appear on the CRT screen between the first front and first back surface echos
Q. Bubblers and wheel transducers are considered:
a. Immersion techniques
b. Modified immersion techniques
c. Contact techniques
d. Offset techniques
Q. Most commercial ultrasonic testing is performed at frequencies between:
a. 1 MHz and 10 MHz
b. 1 MHz and 100 MHz
c. 10 MHz and 50 MHz
d. 1 MHz and 25 MHz
Q. For a transducer with any given Q, resolution increases with:
a. Sensitivity
b. Frequency
c. Wavelength
d. Crystal thickness