MCQOPTIONS
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MCQOPTIONS
This section includes 1267 Mcqs, each offering curated multiple-choice questions to sharpen your Embedded Systems knowledge and support exam preparation. Choose a topic below to get started.
| 601. |
In the same material, shear wave velocity is: |
| A. | Approximately 1/2 longitudinal wave velocity |
| B. | Approximately twice longitudinal wave velocity |
| C. | Approximately 1/4 longitudinal wave velocity |
| D. | Approximately four times longitudinal wave velocity |
| Answer» B. Approximately twice longitudinal wave velocity | |
| 602. |
If the required X ray exposure time for a 225 kV, 5 mA exposure is 3 minutes,approximately what exposure time would be required at 10 mA? |
| A. | 1/2 minute |
| B. | 1 minute |
| C. | 1.5 minutes |
| D. | 3 minutes |
| Answer» D. 3 minutes | |
| 603. |
Deep scratches on lead intensifying screens will cause? |
| A. | Selective image enhancement |
| B. | Irregular light lines on the film |
| C. | Dark lines on the film |
| D. | Unacceptable blockage of the primary radiation beam |
| Answer» C. Dark lines on the film | |
| 604. |
Which penetrant process is best suited for portable application in the field? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» B. Water washable | |
| 605. |
Compared to the magnetic field strength at the outer surface, the magnetic field strength,at the centre of a hollow, nonmagnetic conductor carrying DC current is: |
| A. | I/D |
| B. | The same |
| C. | Zero |
| D. | Need more information to determine |
| Answer» D. Need more information to determine | |
| 606. |
Excessive ringing of the transducer could be caused by: |
| A. | Electrical interference |
| B. | Loose crystal |
| C. | Test piece with large grain size |
| D. | Test piece with small grain size |
| Answer» C. Test piece with large grain size | |
| 607. |
When using a post emulsifiable penetrant process, it is important to drain as much excess penetrant as possible from the surface of a test piece which has been immersed in the penetrant because: |
| A. | Too much penetrant on the part surface may lead to more rapid penetration and over-sensitivity |
| B. | A thinner layer of penetrant is likely to have higher capillary action and, thus, be more sensitive to fine discontinuities |
| C. | A thinner layer of penetrant will result in less penetrant contamination in the emulsifier tank |
| D. | None of the above |
| Answer» E. | |
| 608. |
Which of the following test frequencies would generally provide the best penetrationin a 12 inch thick specimen of coarse-grained steel? |
| A. | 1.0 MHz |
| B. | 2.25 MHz |
| C. | 5.0 MHz |
| D. | 10 MHz |
| Answer» B. 2.25 MHz | |
| 609. |
Slow films: |
| A. | Give better definition than fast films |
| B. | Are faster than fast films |
| C. | Require shorter exposure times than fast films |
| D. | Usually have less contrast than fast films |
| Answer» B. Are faster than fast films | |
| 610. |
If a crack exists in a circular magnet, the attraction of magnetic particles to the crack iscaused by: |
| A. | A coercive force |
| B. | A leakage field |
| C. | A Doppler effect |
| D. | A high reluctance at the crack |
| Answer» C. A Doppler effect | |
| 611. |
Which of the following is used in connection with hydrophilic emulsifier applied byimmersion? |
| A. | Brushing |
| B. | Agitation |
| C. | Drain-dwell |
| D. | All of the above |
| Answer» C. Drain-dwell | |
| 612. |
The retentivity of a material describes: |
| A. | The ease with which it can be magnetized |
| B. | The depth of the magnetic field in the part |
| C. | The length of time required to demagnetise it |
| D. | The ability to retain the magnetic field |
| Answer» E. | |
| 613. |
According to ASME Section VIII, a linear indication is defined as an indication inwhich the length is equal to or greater than the width by a factor of: |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 614. |
A cross section view 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 | |
| 615. |
What are the two most important properties in determining the penetrating ability of a penetrant? |
| A. | Viscosity and surface tension |
| B. | Viscosity and contact angle |
| C. | Surface tension and wetting ability |
| D. | None of the above |
| Answer» D. None of the above | |
| 616. |
A group of indications, some sharp and some broad and fuzzy, were found on an area of a small forging. Demagnetization and re-inspection eliminated these indications. What was the probable cause? |
| A. | Forging lap |
| B. | Magnetic writing |
| C. | Change in permeability |
| D. | Subsurface variation |
| Answer» C. Change in permeability | |
| 617. |
A water based emulsifier is called: |
| A. | Hydrophilic |
| B. | Hydrophobic |
| C. | Lipophilic |
| D. | Fluoroscopic |
| Answer» B. Hydrophobic | |
| 618. |
It is important to initiate the welding arc within the weld groove because: |
| A. | Starting a weld bead outside the groove may overheat the base metal |
| B. | Too rapid heating and cooling of the base metal can cause hard spots which are potential failure initiation sites |
| C. | Starting a weld bead outside the groove results in excessively wide welds |
| D. | None of the above |
| Answer» E. | |
| 619. |
The field in a section of ferromagnetic pipe being magnetized by means of a centralconductor 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 | |
| 620. |
Which of the following is the most common method of packaging film? |
| A. | Individual sheets for use in cassettes |
| B. | Rolls |
| C. | Pre-packaged (‘day-pack’) |
| D. | All of the above |
| Answer» E. | |
| 621. |
When the motion of the particles of a medium is parallel to the direction ofpropagation, the wave being transmitted is called a: |
| A. | Longitudinal wave |
| B. | Shear wave |
| C. | Surface wave |
| D. | Lamb wave |
| Answer» B. Shear wave | |
| 622. |
Hydrophilic emulsifiers may be applied by: |
| A. | Dipping |
| B. | Immersion |
| C. | Spraying |
| D. | All of the above |
| Answer» E. | |
| 623. |
An electrical yoke produces: |
| A. | A longitudinal field |
| B. | A circular field |
| C. | Alternating fields |
| D. | A swinging field |
| Answer» B. A circular field | |
| 624. |
A filter is placed: |
| A. | Between the source and the specimen |
| B. | Between the specimen and the film |
| C. | Around the specimen |
| D. | Behind the film |
| Answer» B. Between the specimen and the film | |
| 625. |
According to API, a non- relevant indication is defined as an indication which in the major dimension is equal to, or less than: |
| A. | 1.59 mm (1/16 inches) |
| B. | 2.4 mm (3/32 inches) |
| C. | 3.2 mm (1/18 inches) |
| D. | 4 mm (5/32 inches) |
| Answer» B. 2.4 mm (3/32 inches) | |
| 626. |
Which of the following can be a source of spurious ultrasonic signals? |
| A. | Surface roughness of the test piece |
| B. | Mode conversion within the test piece |
| C. | Shape or contour of the test piece |
| D. | All of the above |
| Answer» E. | |
| 627. |
A radiograph is made using film X with an exposure of 10 mA-min. Film density obtained in the area of interest is 1.0. If it is desired to achieve a density of 2.0 in the area of interest, what exposure is required? (Log relative exposure = 1.1 for a density of 1.0 and 1.62 for a density of 2.0) |
| A. | 41.67 mA-min |
| B. | 10 mA-min |
| C. | 12.6 mA-min |
| D. | 33.1 mA-min |
| Answer» B. 10 mA-min | |
| 628. |
A depression at the edge of a weld where the base metal has been melted duringwelding is called: |
| A. | Burn through |
| B. | Undercut |
| C. | Root concavity |
| D. | Root convexity |
| Answer» C. Root concavity | |
| 629. |
Which of the following materials of the same alloy is most likely to produce thegreatest amount of sound attenuation over a given distance? |
| A. | A hand forging |
| B. | A coarse grained casting |
| C. | An extrusion |
| D. | The attenuation is equal in all materials |
| Answer» C. An extrusion | |
| 630. |
Magnetic flux density is highest at: |
| A. | The outside surface of a non-ferromagnetic tube magnetised with a central conductor |
| B. | The inside surface of a non-ferromagnetic tube magnetised with a central conductor |
| C. | The outside surface of a ferromagnetic tube magnetised with a central conductor |
| D. | The inside surface of a ferromagnetic tube magnetised with a central conductor |
| Answer» E. | |
| 631. |
An effective method of testing for air bubbles in a pipe is to: |
| A. | Measure pipe back wall echo amplitude |
| B. | Analyze the frequency spectrum of pipe back wall echo |
| C. | Transmit sound across pipe diameter and look for echo loss |
| D. | Transmit sound across pipe diameter and look for echoes from air bubbles |
| Answer» E. | |
| 632. |
What rule describes the direction of current flow (+ to -) when lines of magnetic forcesurround a conductor? |
| A. | Left hand rule |
| B. | Right hand rule |
| C. | Flux rule |
| D. | Reluctance rule |
| Answer» C. Flux rule | |
| 633. |
The radiation from 37 GBq (1 Ci) of Co-60 (0.145 Gy or 14.5R at 30.5 cm or 1 foot)is attenuated in air to approximately 5mR/h at a distance of approximately: |
| A. | 914.5 cm (30 feet) |
| B. | 1524 cm (50 feet) |
| C. | 3048 cm (100feet) |
| D. | 6096 cm (200 feet) |
| Answer» C. 3048 cm (100feet) | |
| 634. |
The gamma factor of Co-60 is: |
| A. | 1.37 R·h-1·Ci-1at one metre |
| B. | 0.59 R·h-1·Ci-1at one metre |
| C. | 0.0062 R·h-1·Ci-1at one metre |
| D. | 0.38 R·h-1·Ci-1at one metre |
| Answer» B. 0.59 R·h-1·Ci-1at one metre | |
| 635. |
The length of the zone adjacent to a transducer in which fluctuations in soundpressure occur is mostly affected by: |
| A. | The frequency of the transducer |
| B. | The diameter of the transducer |
| C. | The length of transducer cable |
| D. | Both (a) and (b) |
| Answer» E. | |
| 636. |
If an exposure time of 60 seconds and source to film distance of 365.7 m (1200 feet) is necessary for a particular exposure, what exposure time would be needed for an equivalent exposure if the source- to-film distance is changed to 457.2 m (1500 feet)? |
| A. | 75 seconds |
| B. | 94 seconds |
| C. | 48 seconds |
| D. | 38 seconds |
| Answer» C. 48 seconds | |
| 637. |
Non-aqueous wet developer is applied: |
| A. | Immediately before removal of excess penetrant |
| B. | Immediately after removal of excess penetrant |
| C. | After the excess penetrant is removed and part surface is dried |
| D. | For maximum sensitivity results |
| Answer» D. For maximum sensitivity results | |
| 638. |
Increasing the mA setting on an X ray machine: |
| A. | Decreases exposure time |
| B. | Increases exposure time |
| C. | Increases the short wavelength components of the X ray beam |
| D. | Decreases the short wavelength components of the X ray beam |
| Answer» B. Increases exposure time | |
| 639. |
The main advantage of having small focal spot on an X ray tube is: |
| A. | Heat is conducted away more efficiently than with a large focal spot |
| B. | A smaller focal spot is unlikely to be damaged from the required tube currents |
| C. | Longer tube life |
| D. | A smaller focal spot allows sharper radiographic images than does a larger |
| Answer» E. | |
| 640. |
Which of the following are ferromagnetic materials? |
| A. | Aluminium, iron, copper |
| B. | Iron, copper, nickel |
| C. | Copper, aluminium, silver |
| D. | Iron, cobalt, nickel |
| Answer» E. | |
| 641. |
Mottled film may result from: |
| A. | Inadequate agitation of the film during development |
| B. | Inadequate water rinse during processing |
| C. | Using exhausted stop bath solution |
| D. | Any of the above |
| Answer» E. | |
| 642. |
Which of the following conditions might cause mottling of a radiographic film? |
| A. | Test piece with thickness equal to an integral multiple of the primary beam wavelength |
| B. | Back scatter from aged fluorescent screens |
| C. | Test piece with thickness of the same order of magnitude as the grain size |
| D. | Test piece with thickness equal to an integral multiple of the average grain size |
| Answer» C. Test piece with thickness of the same order of magnitude as the grain size | |
| 643. |
A common application of an aluminium block containing quench cracks is to: |
| A. | Determine penetrant test sensitivity |
| B. | Compare performance of penetrant materials or processes |
| C. | Determine effects of mechanical cleaning methods on penetrant test results |
| D. | Determine effectiveness of cleaning techniques |
| Answer» B. Compare performance of penetrant materials or processes | |
| 644. |
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 |
| Answer» D. The first critical angle is reached | |
| 645. |
The sensitivity of magnetic particle testing is greatest when the discontinuity is: |
| A. | Parallel to the direction of the magnetic flux lines |
| B. | Perpendicular to the flow of the magnetizing current |
| C. | Perpendicular to the direction of the magnetic flux |
| D. | Perpendicular to the line between prods |
| Answer» D. Perpendicular to the line between prods | |
| 646. |
If a mercury vapour arc black light is inadvertently turned off, how soon may it berestarted? |
| A. | Immediately |
| B. | 5 minutes |
| C. | 10 minutes |
| D. | 15 minutes |
| Answer» D. 15 minutes | |
| 647. |
Magnetic particle testing is most likely to find subsurface discontinuities in: |
| A. | Soft steels with high permeability |
| B. | Soft steels with low permeability |
| C. | Hardened steels with low permeability |
| D. | Hardened steels with high permeability |
| Answer» B. Soft steels with low permeability | |
| 648. |
For a particular isotope, gamma radiation intensity is determined by: |
| A. | Type isotope used |
| B. | Energy level of gamma rays in source |
| C. | Source strength in curies |
| D. | None of the above |
| Answer» D. None of the above | |
| 649. |
The term used to describe the reaction of human reproductive cells, to ionizingradiation is: |
| A. | Genetic effects |
| B. | Somatic effects |
| C. | Corpuscular effects |
| D. | Hematological effects |
| Answer» B. Somatic effects | |
| 650. |
An effect of scattered radiation is to: |
| A. | Decrease required exposure time |
| B. | Diminish contrast, detail and clarity of radiographic image |
| C. | Decrease film density |
| D. | All of the above |
| Answer» C. Decrease film density | |