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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.
| 501. |
When using a hydrophilic emulsifier, the amount of penetrant removed is mostaffected by: |
| A. | Solution strength and time of spray |
| B. | Penetrant dwell time |
| C. | Emulsifier dwell time |
| D. | Adequacy of pre-clean |
| Answer» B. Penetrant dwell time | |
| 502. |
The best method of inducing a circular field in a tube is by a: |
| A. | Central conductor |
| B. | Head shot |
| C. | Coil |
| D. | Prod technique |
| Answer» B. Head shot | |
| 503. |
Halogen content of penetrant materials is limited because of the possibility of stresscorrosion cracking in which of the following materials? |
| A. | High tensile steel |
| B. | Austenitic stainless steel |
| C. | Titanium alloys |
| D. | All of the above |
| Answer» E. | |
| 504. |
How is the correct emulsifier contact time determined? |
| A. | Manufacturer's recommendations |
| B. | One half penetrant dwell time |
| C. | Experiment |
| D. | Same as penetrant dwell time |
| Answer» D. Same as penetrant dwell time | |
| 505. |
Which residual field is most difficult to demagnetise? |
| A. | Longitudinal |
| B. | Circular |
| C. | Vector |
| D. | Binodal |
| Answer» C. Vector | |
| 506. |
Which type of emulsifier is designed to be used as a ‘scrubber’? |
| A. | Hydrophilic |
| B. | Hydrophobic |
| C. | Lipophilic |
| D. | Fluoroscopic |
| Answer» B. Hydrophobic | |
| 507. |
Most fluorescent dyes used for magnetic particle testing fluoresce what colour? |
| A. | Blue green |
| B. | Yellow green |
| C. | Blue black |
| D. | Red orange |
| Answer» C. Blue black | |
| 508. |
The term ‘drag out losses’ refers to: |
| A. | Loss of penetrant materials that are carried from one processing station to another on the test piece |
| B. | Penetrant which is removed from discontinuities during the water washable process |
| C. | Penetrant which is removed from discontinuities because of overemulsification prior to water removal |
| D. | Both b and c |
| Answer» B. Penetrant which is removed from discontinuities during the water washable process | |
| 509. |
Which of the following is a function of an emulsifier? |
| A. | To draw penetrant out of a discontinuity and form a visible indication |
| B. | To increase the size of an indication through capillary action |
| C. | To provide contrasting background for viewing penetrant indications |
| D. | None of the above |
| Answer» E. | |
| 510. |
Which of the following is a function of the lead screen placed around radiographic film? |
| A. | Masks the test piece |
| B. | Improves geometric unsharpness |
| C. | Intensifies effects of the primary radiation beam |
| D. | None of the above |
| Answer» D. None of the above | |
| 511. |
The process of being radioactive is called (Choose one): |
| A. | Heating |
| B. | Decaying |
| C. | Bremsstrahlung |
| D. | Rectification |
| Answer» C. Bremsstrahlung | |
| 512. |
The primary effect of an increase in the kilovoltage at which a X ray tube is beingoperated would be to: |
| A. | Increase the radiation intensity |
| B. | Increase penetrating power |
| C. | Increase penetrating power and radiation intensity |
| D. | Increase primary beam wavelength |
| Answer» C. Increase penetrating power and radiation intensity | |
| 513. |
The longitudinal wave incident angle which results in formation of a rayleigh wave iscalled: |
| A. | Normal incidence |
| B. | The first critical angle |
| C. | The second critical angle |
| D. | Any angle above the first critical angle |
| Answer» D. Any angle above the first critical angle | |
| 514. |
A term used to describe the range of radiation intensities falling on the film duringexposure is: |
| A. | Film contrast |
| B. | Radiographic contrast |
| C. | Subject contrast |
| D. | Radiographic sensitivity |
| Answer» C. Subject contrast | |
| 515. |
According to ASTM E709-95 when dry particles are used magnetic particle testing shallnot be performed on the surface of parts whose temperature exceeds: |
| A. | 57ºC |
| B. | 79ºC |
| C. | 158ºC |
| D. | 136ºC |
| Answer» B. 79ºC | |
| 516. |
If the required X ray exposure time for a 150 kV, 5 mA exposure is 2 minutes,approximately what exposure time would be required at 10 mA? |
| A. | 1/2 minute |
| B. | 1 minute |
| C. | 2 minutes |
| D. | 4 minutes |
| Answer» C. 2 minutes | |
| 517. |
Which type of developer may be either in suspension or a solution? |
| A. | Dry |
| B. | Non-aqueous wet |
| C. | Water based wet |
| D. | None of the above |
| Answer» D. None of the above | |
| 518. |
Which of the following frequencies would probably result in the greatest ultrasonicattenuation losses? |
| A. | 1 MHz |
| B. | 2.25 MHz |
| C. | 10 MHz |
| D. | 25 MHz |
| Answer» E. | |
| 519. |
According to ASTM E709-95, with wet continuous magnetization technique, theduration of magnetization current is of the order of: |
| A. | 0.5 sec |
| B. | 1.0 sec |
| C. | 1.5 sec |
| D. | 2.0 sec |
| Answer» B. 1.0 sec | |
| 520. |
Which of the following welding discontinuities would be most difficult to imageradiographically: |
| A. | Porosity |
| B. | Lack of side wall fusion |
| C. | Undercut |
| D. | Slag inclusions |
| Answer» C. Undercut | |
| 521. |
For a transducer with any given Q, resolution increases with: |
| A. | Sensitivity |
| B. | Frequency |
| C. | Wavelength |
| D. | Crystal thickness |
| Answer» C. Wavelength | |
| 522. |
An indication which is formed when two pieces of magnetised steel come in contactwith each other is called: |
| A. | A metallurgical discontinuity |
| B. | Magnetic writing |
| C. | Magnetic transfer |
| D. | A ferromagnetic notch |
| Answer» C. Magnetic transfer | |
| 523. |
When using a water washable penetrant testing process, why should the water rinsetemperature remain constant? |
| A. | To avoid changes in rinse efficiency |
| B. | To maintain the temperature of the part |
| C. | To avoid over washing |
| D. | To avoid under washing |
| Answer» D. To avoid under washing | |
| 524. |
A defect open to the surface produces an indication which is |
| A. | Sharp and distinct |
| B. | Wide and indefinite |
| C. | Criss-cross |
| D. | High and fuzzy |
| Answer» B. Wide and indefinite | |
| 525. |
The general method of producing X rays involves the sudden deceleration of highvelocity electrons in a solid body called a: |
| A. | Focus cup |
| B. | Filament |
| C. | Target |
| D. | Cathode |
| Answer» D. Cathode | |
| 526. |
An oil based emulsifier is called: |
| A. | Hydrophilic |
| B. | Hydrophobic |
| C. | Lipophilic |
| D. | Fluoroscopic |
| Answer» D. Fluoroscopic | |
| 527. |
Unacceptable radiographic film quality would be indicated by: |
| A. | Artifacts of known origin in the film's area of interest |
| B. | Use of a smaller penetrameter than required |
| C. | H & D density less than 2.0 |
| D. | All of the above |
| Answer» E. | |
| 528. |
An electric current through a copper wire: |
| A. | Creates a magnetic field around the wire |
| B. | Creates magnetic poles in the wire |
| C. | Magnetises the wire |
| D. | Does not create a magnetic field |
| Answer» B. Creates magnetic poles in the wire | |
| 529. |
Which of the following factors affect film graininess? |
| A. | Wavelengths of radiation |
| B. | Film processing conditions |
| C. | Film speed |
| D. | All of the above |
| Answer» E. | |
| 530. |
The minimum size hole in an ASTM penetrameter is: |
| A. | 0.127 mm (0.005inches) |
| B. | 0.254 mm (0.010 inches) |
| C. | 0.508 mm (0.020inches) |
| D. | 0.762 mm (0.030 inches) |
| Answer» C. 0.508 mm (0.020inches) | |
| 531. |
When the orientation of likely discontinuities is unknown, what is the minimumnumber of magnetising operations required to perform an adequate test? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | None of the above |
| Answer» C. 3 | |
| 532. |
A primary purpose of a reference standard is: |
| A. | To provide a guide for adjusting instrument controls to reveal discontinuities that are considered harmful to the end use of the product |
| B. | To give the technician a tool for determining exact discontinuity size |
| C. | To provide assurance that all discontinuities smaller than a certain specified reference reflector are capable of being detected by the test |
| D. | To provide a standard reflector which exactly simulates natural discontinuities of a critical size |
| Answer» D. To provide a standard reflector which exactly simulates natural discontinuities of a critical size | |
| 533. |
A dark crescent shaped mark in the centre of a weld bead radiographic image wouldprobably be: |
| A. | A film artifact |
| B. | Porosity |
| C. | A tungsten inclusion |
| D. | Root concavity |
| Answer» B. Porosity | |
| 534. |
An ultrasonic instrument control which is used to expand or contract the horizontalbase 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 | |
| 535. |
Which of the following techniques would probably reduce the amount of scatteredradiation reaching the film during a radiographic exposure? |
| A. | Using a finer grained film |
| B. | Using a filtered X ray beam |
| C. | Removing lead screens |
| D. | All of the above |
| Answer» C. Removing lead screens | |
| 536. |
Near surface resolution can be improved by: |
| A. | Using a narrow band transducer |
| B. | Using a focused transducer |
| C. | Using a high Q transducer |
| D. | None of the above |
| Answer» C. Using a high Q transducer | |
| 537. |
Lead screens improve mainly the of the final radiograph: |
| A. | Density |
| B. | Contrast |
| C. | Exposure |
| D. | Definition |
| Answer» C. Exposure | |
| 538. |
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» D. None of the above | |
| 539. |
Which of the following is a prerequisite for a penetrant test? |
| A. | Developer must be applied in a thin, even coat |
| B. | Any surface coatings or soils must be completely removed |
| C. | All traces of penetrant materials should be removed after testing is complete |
| D. | The test object must be non-magnetic |
| Answer» C. All traces of penetrant materials should be removed after testing is complete | |
| 540. |
The formula Sin A/Sin B = VA/VB is known as: |
| A. | The Fresnell relationship |
| B. | Snell's law |
| C. | The law of sines |
| D. | The critical velocity ratio |
| Answer» C. The law of sines | |
| 541. |
A photon-electron interaction in which a photon gives up all its energy to an electronis called: |
| A. | The photoelectric effect |
| B. | The Compton effect |
| C. | Pair production |
| D. | Bremsstrahlung |
| Answer» B. The Compton effect | |
| 542. |
Which of the following conditions would be most likely to cause strong, interferingsurface waves? |
| A. | High frequency transducers |
| B. | Testing on a small diameter surface |
| C. | Testing on a flat surface |
| D. | Testing on a curved surface with a contoured wedge and transducer |
| Answer» E. | |
| 543. |
The density difference displayed from one area of a film radiograph to another is called: |
| A. | Subject contrast |
| B. | Radiographic contrast |
| C. | Film contrast |
| D. | Film latitude |
| Answer» C. Film contrast | |
| 544. |
Highest sensitivity to fine surface cracks would be obtained by which of the followingtechniques? |
| A. | Residual field, wet method |
| B. | Residual field, dry method |
| C. | Continuous field, wet method |
| D. | Continuous field, dry method |
| Answer» D. Continuous field, dry method | |
| 545. |
An exposed radiographic film which transmits 1% of the light incident on it has whatdensity: |
| A. | 1.0 |
| B. | 2.0 |
| C. | 99.0 |
| D. | 0.5 |
| Answer» D. 0.5 | |
| 546. |
Radiographic film speed can be increased by using: |
| A. | A higher mA setting |
| B. | A lower mA setting |
| C. | A double emulsion versus a single emulsion film |
| D. | Lead screens versus fluorescent screens |
| Answer» E. | |
| 547. |
Why is it preferable to disassemble parts before magnetic particle inspection? |
| A. | Disassembly makes all surface areas visible |
| B. | Interfaces will create leakage fields which may confuse the inspection |
| C. | It is usually easier to handle the disassembled parts |
| D. | All of the above |
| Answer» E. | |
| 548. |
What equipment is used to determine if a part has been demagnetised? |
| A. | A magnet on the part |
| B. | A field meter |
| C. | A survey meter |
| D. | Careful observation for clinging magnetic particles |
| Answer» C. A survey meter | |
| 549. |
Which of the following might cause non relevant indications? |
| A. | Magnetic writing |
| B. | Indications at the edges of a braze joint |
| C. | A joint between hard and soft steels |
| D. | All of the above |
| Answer» E. | |
| 550. |
Which of the following is not (!) an advantage of a water washable fluorescentpenetrant process? |
| A. | Excess penetrant is easily removed with a water wash |
| B. | It is well suited to testing large quantities of small parts |
| C. | It is readily removed from shallow discontinuities |
| D. | It has low cost, low processing time compared to the post emulsified penetrant process |
| Answer» D. It has low cost, low processing time compared to the post emulsified penetrant process | |