McqMate
Chapters
| 101. |
Another name for a compression wave is a: |
| A. | Lamb wave |
| B. | Shear wave |
| C. | Longitudinal wave |
| D. | Transverse wave |
| Answer» C. Longitudinal wave | |
| 102. |
Under most circumstances, which of the following frequencies would result in the best resolving power? |
| A. | 1 MHz |
| B. | 5 MHz |
| C. | 10 MHz |
| D. | 25 MHz |
| Answer» D. 25 MHz | |
| 103. |
The most useful range of incident longitudinal wave angles for ultrasonic testing is: |
| A. | Normal incidence to the first critical angle |
| B. | First critical angle to the second critical angle |
| C. | Second critical angle to the third critical angle |
| D. | Above the third critical angle |
| Answer» A. Normal incidence to the first critical angle | |
| 104. |
Ultrasonic testing of material where the search unit is in direct contact with the material being tested may be: |
| A. | Straight beam testing |
| B. | Surface wave testing |
| C. | Angle beam testing |
| D. | All of the above |
| Answer» D. All of the above | |
| 105. |
The echo on the cathode ray tube (CRT) which represents the far boundary of the material being tested is called: |
| A. | Hash |
| B. | The initial pulse |
| C. | The ‘main bang’ |
| D. | The back wall echo |
| Answer» D. The back wall echo | |
| 106. |
AA standard block which can be used to calibrate an instrument for an angle beam range calibration is: |
| A. | Area-amplitude blocks |
| B. | Distance-amplitude blocks |
| C. | V1/A2 block |
| D. | Beam spread block |
| Answer» C. V1/A2 block | |
| 107. |
The ability to detect echos from small reflectors is called: |
| A. | Resolution |
| B. | Attenuation |
| C. | Accuracy |
| D. | Sensitivity |
| Answer» D. Sensitivity | |
| 108. |
When the motion of the particles of a medium is parallel to the direction of propagation, the wave being transmitted is called a: |
| A. | Longitudinal wave |
| B. | Shear wave |
| C. | Surface wave |
| D. | Lamb wave |
| Answer» A. Longitudinal wave | |
| 109. |
In contact testing, the entry surface indication is sometimes referred to as: |
| A. | The initial pulse |
| B. | The ‘main bang’ or transmitter pulse |
| C. | Both (a) and (b) |
| D. | None of the above |
| Answer» C. Both (a) and (b) | |
| 110. |
A A second name for Rayleigh waves is: |
| A. | Shear waves |
| B. | Longitudinal waves |
| C. | Transverse waves |
| D. | Surface waves |
| Answer» D. Surface waves | |
| 111. |
Sound beam intensity decreases expontentially with distance in the area called: |
| A. | The near field |
| B. | The far field |
| C. | The dead zone |
| D. | The delay line |
| Answer» B. The far field | |
| 112. |
AA test method employing two seperate search units on opposite surfaces of the material being tested is called: |
| A. | Contact testing |
| B. | Surface wave testing |
| C. | Through-transmission testing |
| D. | Lamb wave testing |
| Answer» C. Through-transmission testing | |
| 113. |
Which of the following is not (!) a requirement of a couplant? |
| A. | Easy application |
| B. | Highly penetrating |
| C. | Harmless both to the test piece and transducers |
| D. | Excludes all air between transducer and test piece |
| Answer» B. Highly penetrating | |
| 114. |
A A plan view representation of a test piece is produced by which of the following? |
| A. | A scan |
| B. | B scan |
| C. | C scan |
| D. | A time line display |
| Answer» C. C scan | |
| 115. |
A A widening of the front surface indication, when testing a rough surface, is caused by: |
| A. | Defects in the test piece |
| B. | A coarse grain structure |
| C. | A partial reflection of ultrasonic beam side lobe energy |
| D. | Ultrasonic instrument malfunction |
| Answer» C. A partial reflection of ultrasonic beam side lobe energy | |
| 116. |
When a vertical indication has reached the maximum signal height which can be displayed or viewed on the CRT of an ultrasonic instrument, the indication is said to have reached its: |
| A. | Distance-amplitude height |
| B. | Absorption level |
| C. | Vertical level |
| D. | Limit of resolution |
| Answer» C. Vertical level | |
| 117. |
AA material used between the face of a search unit and the test surface to permit or improve the transmission of ultrasonic vibrations from the search unit to the material being tested is called: |
| A. | A wetting agent |
| B. | A couplant |
| C. | A acoustic transmitter |
| D. | A lubricant |
| Answer» B. A couplant | |
| 118. |
When an ultrasonic beam passes through the interface between two dissimilar materials at an angle, a new angle of sound travel is formed in the second material due to: |
| A. | Attenuation of ultrasound |
| B. | Transmission of ultrasound |
| C. | Compression of ultrasound |
| D. | Refraction |
| Answer» D. Refraction | |
| 119. |
The velocity of sound waves is primarily dependent on: |
| A. | The pulse length |
| B. | The frequency |
| C. | The material in which the sound is being transmitted and the mode of vibration |
| D. | None of the above |
| Answer» C. The material in which the sound is being transmitted and the mode of vibration | |
| 120. |
Piezoelectric ability is the property of a material to: |
| A. | Become electrically conductive when heated above its critical temperature |
| B. | Generate sound when heated above its critical temperature |
| C. | Vibrate at high frequency when subjected to a temperature gradient |
| D. | Produce an electric current when deformed and vice versa |
| Answer» D. Produce an electric current when deformed and vice versa | |
| 121. |
The boundary between two different materials which are in contact with each other is called: |
| A. | A rarefactor |
| B. | A refractor |
| C. | An interface |
| D. | A marker |
| Answer» C. An interface | |
| 122. |
An ultrasonic insrument control which is used to adjust the sharpness of the CRT screen display is called: |
| A. | Astigmatism or focus |
| B. | Pulse repetition rate |
| C. | Pulse energy |
| D. | Gain |
| Answer» A. Astigmatism or focus | |
| 123. |
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 |
| Answer» D. It provides a larger beam angle and poorer resolving power | |
| 124. |
As transducer crystal thickness decreases: |
| A. | Transducer wavelength increases |
| B. | Frequency decreases |
| C. | Frequency increases |
| D. | None of the above |
| Answer» C. Frequency increases | |
| 125. |
On the area-amplitude ultrasonic standard test blocks, the flat-bottomed holes in the blocks are: |
| A. | All of the same diameter |
| B. | Different in diameter, increasing by 1/64 inch increments from the No. 1 block to the No. 8 block |
| C. | Largest in the No. 1 block and smallest in the No. 8 block |
| D. | Drilled to different depths from the front surface of the test block |
| Answer» B. Different in diameter, increasing by 1/64 inch increments from the No. 1 block to the No. 8 block | |
| 126. |
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 |
| Answer» C. It provides a smaller beam angle and poorer resolving power | |
| 127. |
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 |
| Answer» C. It is scattered more by coarse grained material | |
| 128. |
When a longitudinal wave sound beam passes through an acoustic interface at some angle 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 |
| Answer» C. Reflection, refraction and mode conversion occur | |
| 129. |
The angle of a refracted shear wave generated as a sound wave passes at an angle through 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 |
| Answer» A. The acoustic impedances of the materials on each side of the interface | |
| 130. |
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 |
| Answer» A. Match impedances between the transducer and test piece | |
| 131. |
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 |
| Answer» B. The angle of reflection equals the angle of incidence | |
| 132. |
The ability to detect echoes from small reflectors is called: |
| A. | Resolution |
| B. | Attenuation |
| C. | Accuracy |
| D. | Sensitivity |
| Answer» D. Sensitivity | |
| 133. |
The ability to separate echoes from reflectors close together in depth is called: |
| A. | Resolution |
| B. | Attenuation |
| C. | Accuracy |
| D. | Sensitivity |
| Answer» A. Resolution | |
| 134. |
Which of the following transducer materials is the most efficient receiver of ultrasonic energy? |
| A. | Lead metaniobate |
| B. | Quartz |
| C. | Lithium sulfate |
| D. | Barium titanate |
| Answer» C. Lithium sulfate | |
| 135. |
AA display which shows the initial pulse and the front surface echo superimposed would be considered: |
| A. | An immersion test |
| B. | An A scan |
| C. | A contact test |
| D. | A B scan |
| Answer» B. An A scan | |
| 136. |
AA display which shows the initial pulse and the front surface echo with a fairly wide space between the two would be considered: |
| A. | An immersion test |
| B. | An A scan |
| C. | A contact test |
| D. | A B scan |
| Answer» A. An immersion test | |
| 137. |
When conducting an immersion test, the water path distance must be controlled so that: |
| 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 |
| Answer» C. The test piece discontinuity indications appear between the first front and first back surface echos | |
| 138. |
Bubblers and wheel transducers are considered: |
| A. | Immersion techniques |
| B. | Modified immersion techniques |
| C. | Contact techniques |
| D. | Offset techniques |
| Answer» B. Modified immersion techniques | |
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