McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
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 | |
Done Studing? Take A Test.
Great job completing your study session! Now it's time to put your knowledge to the test. Challenge yourself, see how much you've learned, and identify areas for improvement. Don’t worry, this is all part of the journey to mastery. Ready for the next step? Take a quiz to solidify what you've just studied.