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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.
| 751. |
Thicker materials would normally be inspected using: |
| A. | Lower kV X rays |
| B. | Higher mA X rays |
| C. | Higher kV X rays |
| D. | Lower mA X rays |
| Answer» D. Lower mA X rays | |
| 752. |
What additional surface preparation or cleaning must be performed on a machined orground aluminium casting prior to penetrant testing? |
| A. | Vapour degreasing |
| B. | Etching |
| C. | Detergent wash |
| D. | Nothing |
| Answer» C. Detergent wash | |
| 753. |
The amount of beam divergence from a crystal is primarily dependent onthe: |
| A. | Type of test |
| B. | Tightness of crystal backing in the search unit |
| C. | Frequency and crystal size |
| D. | Pulse length |
| Answer» D. Pulse length | |
| 754. |
The magnetic field is strongest when: |
| A. | The magnetising voltage is flowing |
| B. | The magnetising current is flowing |
| C. | The material exhibits high coercive forces |
| D. | The magnetising current is not flowing |
| Answer» C. The material exhibits high coercive forces | |
| 755. |
Which type of developer would you use to obtain the highest sensitivity test results? |
| A. | Dry |
| B. | Non-aqueous wet |
| C. | Aqueous wet |
| D. | Lipophilic |
| Answer» C. Aqueous wet | |
| 756. |
Cracks which are caused by a combination of tensile stress and corrosion are called: |
| A. | Stress corrosion cracks |
| B. | Cycling cracks |
| C. | Critical cracks |
| D. | Fatigue cracks |
| Answer» B. Cycling cracks | |
| 757. |
The primary form of energy conversion when an X ray tube is energized results in theproduction of: |
| A. | Primary X rays |
| B. | Secondary X ray |
| C. | Short wavelength X ray |
| D. | Heat |
| Answer» D. Heat | |
| 758. |
X rays are produced by: |
| A. | Radioactive isotopes |
| B. | The rapid deceleration of electrons |
| C. | Ultraviolet radiation of unstable atoms |
| D. | All of the above |
| Answer» C. Ultraviolet radiation of unstable atoms | |
| 759. |
The ability of a material to remain magnetic after the magnetising force is removed iscalled: |
| A. | Reluctance |
| B. | Retentivity |
| C. | Permeability |
| D. | Electromagnetism |
| Answer» C. Permeability | |
| 760. |
The penetrating power of an X ray machine is indicated by: |
| A. | Milliamperage |
| B. | Tube voltage |
| C. | Filament current |
| D. | Anode current |
| Answer» C. Filament current | |
| 761. |
According to ASTM E709-95 in using prod technique, prod spacing shall not exceed: |
| A. | 50 mm |
| B. | 100 mm |
| C. | 150 mm |
| D. | 200 mm |
| Answer» E. | |
| 762. |
An advantage of using lower frequencies during ultrasonic testing is that: |
| A. | Near surface resolution is improved |
| B. | Sensitivity to small discontinuities is improved |
| C. | Beam spread is reduced |
| D. | Sensitivity to unfavourable oriented flaws is improved |
| Answer» E. | |
| 763. |
A detrimental effect of fluorescent screens might be: |
| A. | High definition |
| B. | Screen mottle |
| C. | Non-linear attenuation |
| D. | Displaced core effect |
| Answer» C. Non-linear attenuation | |
| 764. |
A 50 percent decrease in echo amplitude is equal to a loss of how many decibels? |
| A. | 2 |
| B. | 6 |
| C. | 10 |
| D. | 14 |
| Answer» C. 10 | |
| 765. |
The film processing step in which the undeveloped silver bromide is removed fromthe film emulsion is called: |
| A. | Development |
| B. | Stop bath |
| C. | Fixing |
| D. | Rinsing |
| Answer» B. Stop bath | |
| 766. |
Which of the following is a likely effect of a rough test piece surface? |
| A. | An improved ultrasonic signal to noise ratio |
| B. | A more penetrating sound beam |
| C. | Loss of discontinuity signal amplitude |
| D. | Higher test reliability |
| Answer» D. Higher test reliability | |
| 767. |
If the radiation intensity is 5.9 Gy/h (590 R/h) at a distance of 30.5 cm (1 foot) from asource, 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) | |
| 768. |
The primary reason for using water rather than oil as a suspension medium for wetmethod 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 | |
| 769. |
A residual field is always less than a continuous field because? |
| A. | The magnetic field, as shown by a hysteresis curve, is zero when there is no magnetising force |
| B. | The magnetic field, as shown by a hysteresis curve, is less when there is no magnetising force |
| C. | The magnetic field, as shown by a hysteresis curve, is greater when there is no magnetising force |
| D. | None of the above |
| Answer» C. The magnetic field, as shown by a hysteresis curve, is greater when there is no magnetising force | |
| 770. |
Addition of approximately 6% antimony as an alloying element could be expected toincrease the ultrasonic inspectability of which of the following materials? |
| A. | Low carbon steel |
| B. | Stainless steel |
| C. | Iron |
| D. | Pure lead |
| Answer» E. | |
| 771. |
A penetrant that is self-emulsifying is called: |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post-emulsified |
| D. | Dual sensitivity method |
| Answer» C. Post-emulsified | |
| 772. |
Strong signals which travel across the horizontal time base of an A scan presentationwhile the transducer is motionless on the test piece are probably: |
| A. | Randomly oriented flaws |
| B. | Electrical interference |
| C. | Grain noise |
| D. | Loose wedge on transducer |
| Answer» C. Grain noise | |
| 773. |
According to API, the acceptable particle concentration of wet particle solution forfluorescent particles is: |
| A. | 0.1 to 0.4 mL by volume |
| B. | 0.1 to 0.5 mL by volume |
| C. | 0.1 to 0.6 mL by volume |
| D. | 0.1 to 0.7 mL by volume |
| Answer» B. 0.1 to 0.5 mL by volume | |
| 774. |
The magnetism which remains in a piece of magnetisable material after the magnetising force has been removed is called the: |
| A. | Tramp field |
| B. | Residual field |
| C. | Damped field |
| D. | Permanent field |
| Answer» C. Damped field | |
| 775. |
For direct contact magnetising methods, current should be flowing in what directionrelative to expected discontinuities? |
| A. | Parallel |
| B. | At 45o |
| C. | At 90o |
| D. | At 180o |
| Answer» B. At 45o | |
| 776. |
Which of the following is normally prohibited as a method of removing excesspenetrant when using the solvent removable penetrant process? |
| A. | A water spray |
| B. | A hydrophilic scrubber |
| C. | A solvent spray |
| D. | Clean with lint free towels moistened with solvent |
| Answer» D. Clean with lint free towels moistened with solvent | |
| 777. |
A dark, sharply defined, straight line in the centre of the weld, and running parallel withthe length of the weld should be interpreted as: |
| A. | Porosity |
| B. | Incomplete penetration |
| C. | A slag inclusion |
| D. | Lack of fusion |
| Answer» C. A slag inclusion | |
| 778. |
Acoustic energy propagates in different modes. Which of the following represent amode? |
| A. | Longitudinal wave |
| B. | Shear wave |
| C. | Surface wave |
| D. | All of the above |
| Answer» E. | |
| 779. |
A 7.6 cm (3 inches) thick test specimen is radiographed with a source having size of 1.3 cm (1/2 inch), the film is placed in contact with the test specimen. The source to film distance is 40.6 cm (16 inches).The geometric unsharpness obtained is: |
| A. | 0.1 cm |
| B. | 0.3 cm |
| C. | 0.5 cm |
| D. | 1.0 cm |
| Answer» C. 0.5 cm | |
| 780. |
The type of discontinuity which magnetic particle testing most effectively locates is: |
| A. | Slag inclusions |
| B. | Magnetic writing |
| C. | Porosity |
| D. | Surface cracks |
| Answer» E. | |
| 781. |
Indications which are caused by design or construction of the test piece are called? |
| A. | Relevant |
| B. | Non-relevant |
| C. | False |
| D. | Real |
| Answer» C. False | |
| 782. |
In an A scan presentation, the amplitude of vertical indications on the screen representsthe: |
| A. | Amount of ultrasonic sound energy returning to the search unit |
| B. | Distance travelled by the search unit |
| C. | Thickness of material being tested |
| D. | Elapsed time since the ultrasonic pulse was generated |
| Answer» B. Distance travelled by the search unit | |
| 783. |
For adequate test results, the black light used in fluorescent penetrant examinationshould provide what minimum black light intensity at the test surface? |
| A. | 100 foot candles per square centimetre |
| B. | 1000 microwatts per square centimetre |
| C. | 800 foot candles |
| D. | 35 microwatts per square centimetre |
| Answer» C. 800 foot candles | |
| 784. |
The human eye is most sensitive to which of the following types of light? |
| A. | Yellow-green |
| B. | Red |
| C. | Blue-violet |
| D. | Orange |
| Answer» D. Orange | |
| 785. |
A discontinuity which is produced during solidification of the molten metal is called: |
| A. | Inherent |
| B. | Processing |
| C. | Service |
| D. | None of the above |
| Answer» B. Processing | |
| 786. |
When a drain-dwell technique is used during emulsification, what two mechanisms areresponsible for combining the emulsifier and penetrant? |
| A. | Diffusion and turbulent mixing |
| B. | Osmosis and agitation |
| C. | Turbulent mixing and osmosis |
| D. | Agitation and turbulent mixing |
| Answer» B. Osmosis and agitation | |
| 787. |
Which of the following developers would you expect to be the most sensitive? |
| A. | Water suspendable wet (immersion) |
| B. | Water suspendable wet (spray) |
| C. | Dry immersion (dip) |
| D. | Non-aqueous wet (solvent spray) |
| Answer» E. | |
| 788. |
What governs the penetrating ability of an X ray beam? |
| A. | Kilovoltage |
| B. | Time |
| C. | Activity |
| D. | Milliamperage |
| Answer» B. Time | |
| 789. |
Wavelength is: |
| A. | The distance from the crest to the next trough of a sound wave |
| B. | The time required for a sound wave to propagate from a trough to the next trough of a sound wave |
| C. | The distance a sound wave travels in one second |
| D. | The distance from trough to trough or from peak to peak of a sound wave |
| Answer» E. | |
| 790. |
The angle formed by an ultrasonic wave as it enters a medium of different velocity thanthe one from which it came and a line drawn perpendicular to the interface between the two media is called: |
| A. | The angle of incidence |
| B. | The angle of refraction |
| C. | The angle of diffraction |
| D. | The angle of reflection |
| Answer» C. The angle of diffraction | |
| 791. |
Which of the following is intended to be a ‘first cut’ or rough inspection device to befollowed by more precise evaluation of any discontinuities found? |
| A. | Wheel transducer |
| B. | Focused transducer |
| C. | Paintbrush transducer |
| D. | Ball transducer |
| Answer» D. Ball transducer | |
| 792. |
A low density image of the letter ‘B’ on a radiographic film would probably be causedby: |
| A. | Under exposure |
| B. | Excessive exposure |
| C. | Excessive backscatter |
| D. | Insufficient backscatter |
| Answer» D. Insufficient backscatter | |
| 793. |
A change in which of the following parameters would require a new X ray exposurechart? |
| A. | kV |
| B. | Required film density |
| C. | Test piece thickness |
| D. | All of the above |
| Answer» C. Test piece thickness | |
| 794. |
The amount of X radiation or gamma radiation is often spoken of as theof the radiation: |
| A. | Wavelength |
| B. | Energy |
| C. | Intensity |
| D. | Frequency |
| Answer» D. Frequency | |
| 795. |
The correct number of ampere-turns for a given test specimen is determined by: |
| A. | Its length |
| B. | The material and its diameter |
| C. | Both the length and the material |
| D. | Its diameter and length |
| Answer» E. | |
| 796. |
A dark crescent shaped spot, clearly in the base metal adjacent to a weld wouldprobably be: |
| A. | Burn through |
| B. | Film crimp mark |
| C. | A crack |
| D. | A water spot on the film |
| Answer» C. A crack | |
| 797. |
While performing a fluorescent water washable penetrant test, which of the followingsteps should be performed under black light? |
| A. | Penetrant application |
| B. | Excess penetrant removal |
| C. | Emulsification |
| D. | Developer application |
| Answer» C. Emulsification | |
| 798. |
Which of the following is not normally recommended? |
| A. | Performing a fluorescent penetrant test following a visible penetrant test? |
| B. | Performing a visible penetrant test following a fluorescent test |
| C. | Removing excess penetrant with a water spray |
| D. | Removing excess penetrant with towels moistened with solvent |
| Answer» B. Performing a visible penetrant test following a fluorescent test | |
| 799. |
Wet magnetic particle strength is checked by which of the following? |
| A. | Specific gravity |
| B. | Optical density |
| C. | Settling test |
| D. | None of the above |
| Answer» D. None of the above | |
| 800. |
Almost all gamma radiography today is done with artificially activated: |
| A. | Particles |
| B. | Isotopes |
| C. | Radium |
| D. | X ray machines |
| Answer» C. Radium | |