MCQOPTIONS
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MCQOPTIONS
This section includes 335 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
According to ASTM E709-95 direct current electromagnetic yokes should have a lifting force of at least: |
| A. | 15 kg |
| B. | 16 kg |
| C. | 17 kg |
| D. | 18 kg |
| Answer» E. | |
| 102. |
A change in which of the following parameters would require a new X ray exposure chart? |
| A. | kV |
| B. | Required film density |
| C. | Test piece thickness |
| D. | All of the above |
| Answer» C. Test piece thickness | |
| 103. |
The primary reason for using water rather than oil as a suspension medium for wet method baths is that: |
| A. | Water is more chemically inert than oil |
| B. | Bath flammability hazards are eliminated |
| C. | Water has the capability to dissolve the needed rust inhibitors |
| D. | Water baths may be used at lower temperatures than oil baths |
| Answer» C. Water has the capability to dissolve the needed rust inhibitors | |
| 104. |
According to ASTM E709-95, Table 3., alternating current electromagnetic yokes must have a lifting force of at least: |
| A. | 3.0 kg (7 lb) |
| B. | 3.5 kg (8 lb) |
| C. | 4.0 kg (9 lb) |
| D. | 4.5 kg (10 lb) |
| Answer» E. | |
| 105. |
The areas on a magnetised part from which the magnetic field is leaving or returning into the part are called: |
| A. | Salient points |
| B. | Defects |
| C. | Magnetic poles |
| D. | Nodes |
| Answer» D. Nodes | |
| 106. |
The field in a section of ferromagnetic pipe being magnetized by means of a central conductor is strongest at the: |
| A. | Ends of the pipe |
| B. | Outer surface of the pipe |
| C. | Inner surface of the pipe |
| D. | The field is uniform at all places |
| Answer» D. The field is uniform at all places | |
| 107. |
A change in which of the following parameters would necessitate the construction of a new X ray exposure chart? |
| A. | X ray machine used |
| B. | Film type |
| C. | Focal spot to film distance |
| D. | Any of the above |
| Answer» B. Film type | |
| 108. |
An ultrasonic test using a straight beam contact search unit is being conducted through the thickness of a flat part such as a plate. This test should detect: |
| A. | Laminar-type flaws with major dimensions parallel to the rolled surface |
| B. | Transverse-type flaws with major dimensions at right angles to the rolled surface |
| C. | Radial flaws with major dimensions along length but radially oriented to the rolled surface |
| D. | None of the above |
| Answer» B. Transverse-type flaws with major dimensions at right angles to the rolled surface | |
| 109. |
In immersion testing, the position of the search unit is often varied to transmit sound into the test part at various angles to the front surface. Such a procedure is referred to as: |
| A. | Angulation |
| B. | Dispersion |
| C. | Reflection testing |
| D. | Refraction |
| Answer» B. Dispersion | |
| 110. |
Which technique would most likely be used to examine a weld, with the weld cap still in place? |
| A. | Through transmission testing |
| B. | Angle beam testing |
| C. | Straight beam testing |
| D. | None of the above |
| Answer» C. Straight beam testing | |
| 111. |
In immersion testing, verification that the search unit is normal to a flat entry surface is indicated by: |
| A. | Maximum reflection from the entry surface |
| B. | Proper wavelength |
| C. | Maximum amplitude of the initial pulse |
| D. | Elimination of water multiples |
| Answer» B. Proper wavelength | |
| 112. |
Which one of the following steps is necessary to dissolve the undarkened silver salt crystals in the film emulsion: |
| A. | Developing |
| B. | Fixing |
| C. | Washing |
| D. | None of the above |
| Answer» C. Washing | |
| 113. |
In a basic ultrasonic test pattern (A scan) for contact testing, the initial pulse (assume no sweep delay is used): |
| A. | Is the high indication on the extreme left side of the screen that represents the entry surface of the inspected part |
| B. | Is the first pulse that occurs near the right side of the screen and represents the opposite boundary of the inspected part |
| C. | Is an indication that appears and disappears during screening |
| D. | Is always the second pulse from the left on the viewing screen |
| Answer» B. Is the first pulse that occurs near the right side of the screen and represents the opposite boundary of the inspected part | |
| 114. |
An ultrasonic testing technique in which the transducer element is not parallel to the test surface is called: |
| A. | Angle beam testing |
| B. | Immersion testing |
| C. | Contact testing |
| D. | Through-transmission testing |
| Answer» B. Immersion testing | |
| 115. |
The ultrasonic test method in which finger damping is most effective in locating a discontinuity is: |
| A. | Shear wave |
| B. | Longitudinal wave |
| C. | Surface wave |
| D. | Compression wave |
| Answer» D. Compression wave | |
| 116. |
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» E. | |
| 117. |
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» D. Beam spread block | |
| 118. |
A penetrant testing method in which the degree of washability can be controlled by the operator is called: |
| A. | Self emulsifying |
| B. | Post emulsifiable |
| C. | Water washable |
| D. | Solvent removable |
| Answer» D. Solvent removable | |
| 119. |
After the step wedge radiographs have been made, the of the image of each step is recorded on chart: |
| A. | Sharpness |
| B. | Contrast |
| C. | Density |
| D. | Length |
| Answer» D. Length | |
| 120. |
The longitudinal wave incident angle at which the refracted shear wave angle equals ninety degrees is called: |
| A. | The Snell angle |
| B. | The Snell constant |
| C. | The first critical angle |
| D. | The second critical angle |
| Answer» E. | |
| 121. |
When a sound beam is incident on an acoustic interface at some angle other than normal incidence, which of the following occurs? |
| A. | Reflection |
| B. | Refraction |
| C. | Mode conversion |
| D. | All of the above |
| Answer» E. | |
| 122. |
The first critical angle is defined as the longitudinal wave incident angle which results in: |
| A. | A refracted longitudinal wave of ninety degrees |
| B. | A refracted shear wave of ninety degrees |
| C. | Complete reflection of the shear wave |
| D. | None of the above |
| Answer» B. A refracted shear wave of ninety degrees | |
| 123. |
The opposition that a ferromagnetic material shows to the establishment of a magnetic field is called: |
| A. | Retentivity |
| B. | Reluctance |
| C. | Coercive force |
| D. | Permeability |
| Answer» C. Coercive force | |
| 124. |
Sound waves of a frequency beyond the hearing range of the human ear are referred to as ultrasonic waves or vibrations, and the term embraces all vibrational waves of frequency greater than approximately: |
| A. | 20 kHz |
| B. | 2 MHz |
| C. | 2 kHz |
| D. | 200 kHz |
| Answer» B. 2 MHz | |
| 125. |
The formula, NI = 45000/(L/D), is used to calculate the proper magnetising current for: |
| A. | Prod magnetization |
| B. | A head shot |
| C. | A central conductor |
| D. | Coil magnetisation |
| Answer» E. | |
| 126. |
For direct contact magnetising methods, current should be flowing in what direction relative to expected discontinuities? |
| A. | Parallel |
| B. | At 45o |
| C. | At 90o |
| D. | At 180o |
| Answer» B. At 45o | |
| 127. |
The relationship between the longitudinal wave incident angle and the refracted shear wave angle is defined by: |
| A. | Snell's law |
| B. | Snell's constant |
| C. | The law of acoustics |
| D. | Fraunhofer s law |
| Answer» B. Snell's constant | |
| 128. |
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» B. The frequency of the incident sound wave | |
| 129. |
The angle of a refracted shear wave generated as a sound wave passes at an angle through an acoustic interface is dependant on: |
| A. | The acoustic impedances of the materials of 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» B. The frequency of the incident sound wave | |
| 130. |
During immersion testing of pipe or tubing the incident longitudinal wave angle must be limited to a narrow range. The reason for the upper limit is: |
| A. | To avoid complete reflection of ultrasound from the test piece |
| B. | To prevent formation of Rayleigh waves |
| C. | To prevent formation of shear waves |
| D. | To avoid saturating the test piece with ultrasound |
| Answer» B. To prevent formation of Rayleigh waves | |
| 131. |
A calibration for immersion ultrasonic testing of pipe or tubing should establish a transducer position such as: |
| A. | I.D. and O.D. notches produce equal responses for equivalent metal path distances |
| B. | Rayleigh waves are generated through the entire pipe or tubing wall |
| C. | All ultrasound enters the test piece |
| D. | Only longitudinal waves are generated in the test piece |
| Answer» D. Only longitudinal waves are generated in the test piece | |
| 132. |
The amount of X radiation or gamma radiation is often spoken of as the of the radiation: |
| A. | Wavelength |
| B. | Energy |
| C. | Intensity |
| D. | Frequency |
| Answer» D. Frequency | |
| 133. |
During immersion ultrasonic testing of pipe or tubing, spurious echoes may be caused by: |
| A. | Dirt on the test piece |
| B. | Grease on the test piece |
| C. | Air bubbles on the test piece |
| D. | All of the above |
| Answer» E. | |
| 134. |
If the radiation intensity is 5.9 Gy/h (590 R/h) at a distance of 30.5 cm (1 foot) from a source, how far is it to the point where the radiation intensity is 0.02 Gy/h (2R/h)? |
| A. | 518 cm (17 feet) |
| B. | 16551 cm (543 feet) |
| C. | 8291 cm (272 feet) |
| D. | 17983 cm (590 feet) |
| Answer» B. 16551 cm (543 feet) | |
| 135. |
If the radiation intensity is 5 Gy/h (500 R/h) at a distance of 152.4 cm (5 feet) from a source, how far is it to the point where the radiation intensity is 0.05 Gy/h (5 R/h)? |
| A. | 1676.4 cm (55 feet) |
| B. | 1981 cm (65 feet) |
| C. | 1524 cm (50 feet) |
| D. | 762 cm (25 feet) |
| Answer» D. 762 cm (25 feet) | |
| 136. |
At 61 cm (two feet) from a radiation source, radiation intensity is 3 Gy/h (300 R/h). What is the Intensity at 244 cm (8 feet) from the source? |
| A. | 0.12 Gy/h (12R/h) |
| B. | 1.2 Gy/h (120 R/h) |
| C. | 0.1875 Gy/h (18.75 R/h) |
| D. | 0.28 Gy/h (28 R/h) |
| Answer» D. 0.28 Gy/h (28 R/h) | |
| 137. |
A radiation producing device which emits radiation of one or a few discreet wavelengths is: |
| A. | An X ray machine |
| B. | A linear accelerator |
| C. | A gamma ray source |
| D. | A betatron |
| Answer» D. A betatron | |
| 138. |
If a mercury vapour arc black light is inadvertently turned off, how soon may it be restarted? |
| A. | Immediately |
| B. | 5 minutes |
| C. | 10 minutes |
| D. | 15 minutes |
| Answer» D. 15 minutes | |
| 139. |
Deterioration of penetrant material performance may be caused by which of the following? |
| A. | Water contamination |
| B. | Heat |
| C. | Cleaning solvents |
| D. | All of the above |
| Answer» E. | |
| 140. |
An ultrasonic instrument control which allows moving an A scan display to the left or right without changing the distance between any echoes displayed is called: |
| A. | The sweep length or range control |
| B. | The damping control |
| C. | The sweep delay |
| D. | The pulse length control |
| Answer» D. The pulse length control | |
| 141. |
An oscilloscope display in which the screen base line is adjusted to represent the one way distance in a test piece is called a: |
| A. | A scan display |
| B. | B scan display |
| C. | C scan display |
| D. | D scan display |
| Answer» C. C scan display | |
| 142. |
An ultrasonic instrument control which is used to expand or contract the horizontal base line of an A scan display is called: |
| A. | The sweep length or range control |
| B. | The damping control |
| C. | The sweep delay |
| D. | The pulse length control |
| Answer» B. The damping control | |
| 143. |
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» B. Pulse repetition rate | |
| 144. |
Which of the following frequencies would probably result in the greatest ultrasonic attenuation losses? |
| A. | 1 MHz |
| B. | 2.25 MHz |
| C. | 10 MHz |
| D. | 25 MHz |
| Answer» E. | |
| 145. |
Which of the following types of magnetic fields may be present without any external evidence? |
| A. | Circular |
| B. | Longitudinal |
| C. | Secondary |
| D. | Tertiary |
| Answer» B. Longitudinal | |
| 146. |
In general, which of the following materials would have the least ultrasonic attenuation? |
| A. | Aluminium |
| B. | Silver |
| C. | Lead |
| D. | Tungsten |
| Answer» B. Silver | |
| 147. |
An inspection for surface and subsurface discontinuities in ferromagnetic welds would best be accomplished by which of the following techniques? |
| A. | Prods |
| B. | AC yoke |
| C. | Half wave DC yoke |
| D. | None of the above |
| Answer» B. AC yoke | |
| 148. |
What type of search unit allows the greatest resolving power with standard ultrasonic testing equipment? |
| A. | Delay tip |
| B. | Focused |
| C. | Highly damped |
| D. | High Q |
| Answer» C. Highly damped | |
| 149. |
Reference standards containing a series of flat bottom holes of the same diameter at different depths in each block are called? |
| A. | Area-amplitude blocks |
| B. | Distance-amplitude blocks |
| C. | IIW blocks |
| D. | Sizing blocks |
| Answer» C. IIW blocks | |
| 150. |
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» E. | |