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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.
| 351. |
The most common cause of non relevant indications in MT is: |
| A. | Over magnetisation |
| B. | Low amperage |
| C. | High flux density |
| D. | Under magnetisation |
| Answer» B. Low amperage | |
| 352. |
Lead screen are primarily used to: |
| A. | Improve the quality of the radiography by increasing the effect of scatter radiation |
| B. | Intensify the primary beam |
| C. | Decrease film graininess |
| D. | Reduce density of film |
| Answer» C. Decrease film graininess | |
| 353. |
Retentivity: |
| A. | Represents the ability to induce magnetism in a ferromagnetic body by an outside magnetising force |
| B. | Represents the ability of a material to resist the establishment of magnetic flux within it |
| C. | Represents the ability of a material to retain a portion of the magnetic field set up in it after the magnetising force has been removed |
| D. | Is not a term used in magnetic particle testing |
| Answer» D. Is not a term used in magnetic particle testing | |
| 354. |
Calculate the refracted shear wave angle in aluminium [VS = 0.31cm/microsec] for anincident longitudinal wave of 53 degrees in Plexiglas [VL = 0.267cm/microsec] |
| A. | 53 degrees |
| B. | 61 degrees |
| C. | 42 degrees |
| D. | 68 degrees |
| Answer» E. | |
| 355. |
A material with a wider hysteresis loop has: |
| A. | Lower reluctance |
| B. | Lower residual magnetism |
| C. | Higher residual magnetism |
| D. | Higher permeability |
| Answer» D. Higher permeability | |
| 356. |
Diffusion of a lipophilic emulsifier penetrant into the test piece surface is stopped by: |
| A. | The conclusion of the emulsifier dwell time |
| B. | The penetrant |
| C. | Application of developer |
| D. | The water rinse step |
| Answer» E. | |
| 357. |
The standard dose rate of a radioactive isotope is expressed in: |
| A. | Roentgens per hour per curie at any standardised distance not exceeding 75 feet |
| B. | Roentgens per hour per curie per foot |
| C. | Roentgens per hour at a distance of one foot |
| D. | Curies per hour |
| Answer» D. Curies per hour | |
| 358. |
Which of the following is the most effective method for the detection of extremelydeep-lying defects: |
| A. | Dry residual method using DC surge |
| B. | Wet continuous method using half wave rectified current |
| C. | Wet residual method |
| D. | Dry continuous method using half wave rectified current with prods |
| Answer» E. | |
| 359. |
As ultrasonic frequency increases: |
| A. | Wavelength increases |
| B. | Wavelength decreases |
| C. | Sound velocity increases |
| D. | Sound velocity decreases |
| Answer» C. Sound velocity increases | |
| 360. |
The average energy of a Ir-192 source is approximately: |
| A. | 60-80 keV |
| B. | 660 keV |
| C. | 400 keV |
| D. | 1.2 MeV |
| Answer» E. | |
| 361. |
Which of the following penetrant has a built-in emulsifier |
| A. | Water washable |
| B. | Solvent removable |
| C. | Post emulsified |
| D. | All of the listed above |
| Answer» B. Solvent removable | |
| 362. |
Magnetic lines of force enter and leave a magnet at: |
| A. | Saturation |
| B. | L/D ratios of greater than 4 to 1 |
| C. | Flux concentration points |
| D. | Poles |
| Answer» E. | |
| 363. |
Which of the following is a disadvantage of contact testing? |
| A. | Ability to maintain uniform coupling on rough surface |
| B. | Ease of field use |
| C. | Greater penetrating power than immersion testing |
| D. | Less penetrating power than immersion testing |
| Answer» B. Ease of field use | |
| 364. |
The temperature above which steels become nonmagnetic is called the: |
| A. | Zero retentivity |
| B. | Curie point |
| C. | Demagnetisation temperature |
| D. | Random polar point |
| Answer» C. Demagnetisation temperature | |
| 365. |
Which penetrant process is the most sensitive to detect fine discontinuities? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable fluorescent |
| D. | Water washable fluorescent |
| Answer» D. Water washable fluorescent | |
| 366. |
The field in a section of pipe being magnetised by means of a central conductor isstronger at: |
| A. | The ends of the pipe |
| B. | The outer surface of the pipe |
| C. | The inside surface of the pipe |
| D. | The middle of the pipe wall |
| Answer» D. The middle of the pipe wall | |
| 367. |
According to ASMT E709-95 alternating current electromagnetic yokes should give alifting force of at least: |
| A. | 1.5 kg |
| B. | 2.5 kg |
| C. | 3.5 kg |
| D. | 4.5 kg |
| Answer» E. | |
| 368. |
Acoustic impedance is a material's: |
| A. | (Density)/(velocity) |
| B. | (Density) × (velocity) |
| C. | Refractive index |
| D. | (Density)/(refractive index) |
| Answer» C. Refractive index | |
| 369. |
Typical ranges of emulsifier dwell times are: |
| A. | 5 to 10 minutes |
| B. | 30 seconds to 1 minute |
| C. | 1 to 3 minutes |
| D. | 5 to 10 minutes |
| Answer» D. 5 to 10 minutes | |
| 370. |
According to ASTM E709-95 when fluorescent particles are used, the UV lightintensity shall be above: |
| A. | 700 µW/cm2 |
| B. | 800 µW/cm2 |
| C. | 900 µW/cm2 |
| D. | 1000 µW/cm2 |
| Answer» E. | |
| 371. |
A penetrant which requires a separate emulsification step prior to removal from the surface of the test piece is called? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Solvent suspended |
| Answer» D. Solvent suspended | |
| 372. |
A continuous linear indication along the edge of a new fillet weld would most likelybe a: |
| A. | Crater crack |
| B. | Fatigue crack |
| C. | Stress corrosion crack |
| D. | Heat affected zone hydrogen crack |
| Answer» E. | |
| 373. |
An advantage of a double versus a single emulsion film is: |
| A. | It is higher speed |
| B. | It is finer grained |
| C. | It is lower speed |
| D. | None of the above |
| Answer» B. It is finer grained | |
| 374. |
A metal that is difficult to magnetise is said to have: |
| A. | High permeability |
| B. | Low permeability |
| C. | High reluctance |
| D. | Low retentivity |
| Answer» C. High reluctance | |
| 375. |
Sound waves of a frequency beyond the hearing range of the human ear are referred toas 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 | |
| 376. |
A possible result of failing to use a stop bath during manual development is: |
| A. | Streaking of the film |
| B. | Underdevelopment of the film |
| C. | Contamination of the developer solution |
| D. | Developer solution drag-out |
| Answer» B. Underdevelopment of the film | |
| 377. |
A penetrant testing method in which an emulsifier, separate from the penetrant, is usedis called: |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifying |
| D. | Self emulsifying |
| Answer» D. Self emulsifying | |
| 378. |
In longitudinal magnetisation the proper term for calculating magnetising force is: |
| A. | Amperes |
| B. | Ampere-turns |
| C. | Watts |
| D. | Ohms |
| Answer» C. Watts | |
| 379. |
Acceptable methods of penetrant application are: |
| A. | Spraying |
| B. | Dipping |
| C. | Brushing |
| D. | All of the above |
| Answer» E. | |
| 380. |
When conducting an immersion test, the water path distance must be controlled sothat: |
| 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» D. The second front surface echo does not appear on the CRT screen between the first front and first back surface echos | |
| 381. |
When a magnetic field cuts across a crack: |
| A. | Electrons begin jumping back and forth across the crack |
| B. | The crack begins to heat up |
| C. | Magnetic poles form at the edges of the crack |
| D. | All of the above |
| Answer» D. All of the above | |
| 382. |
A straight, dark line in the centre of a weld bead image on film would be suspected ofbeing: |
| A. | Lack of fusion |
| B. | A crack |
| C. | Incomplete penetration |
| D. | Root concavity |
| Answer» D. Root concavity | |
| 383. |
‘Undercut’ or ‘burned out’ edges of the test piece film image are caused by: |
| A. | Geometric unsharpness |
| B. | Scattered radiation |
| C. | Inadequate source to film distance |
| D. | Old film |
| Answer» C. Inadequate source to film distance | |
| 384. |
Why is the need for a dry surface prior to developer application more of a disadvantage with a dry developer than with a non-aqueous wet developer? |
| A. | Because the dry developer only forms a thin film on the surface of the test piece |
| B. | Because the solvent in a non-aqueous wet developer penetrates deeper into discontinuities to contact entrapped penetrant and draw it back out |
| C. | Because the warm test piece causes evaporation of the solvent in the nonaqueous developer |
| D. | All of the above |
| Answer» B. Because the solvent in a non-aqueous wet developer penetrates deeper into discontinuities to contact entrapped penetrant and draw it back out | |
| 385. |
How can parts be tested to determine if they have been adequately demagnetized? |
| A. | By bringing a suspended paper clip near the middle of the part |
| B. | By using a small horseshoe permanent magnet |
| C. | By using a small magnetometer held at a corner of the part |
| D. | By sprinkling some magnetic particles on the part |
| Answer» D. By sprinkling some magnetic particles on the part | |
| 386. |
According to ASTM E709-95 the UV light shall be centred on (1 Å = 10-10m): |
| A. | 3000Å |
| B. | 3250 Å |
| C. | 3400Å |
| D. | 3650 Å |
| Answer» E. | |
| 387. |
If the radiation intensity is 1 Gy/h (100 R/h) at a distance of 152.4 cm (5 feet) from asource, what is the intensity at 610 cm (20 feet)? |
| A. | 0.0625 Gy/h (6.25 R/h) |
| B. | 0.25 Gy/h (25 R/h) |
| C. | 16 Gy/h (1600 R/h) |
| D. | 4 Gy/h (400 R/h) |
| Answer» B. 0.25 Gy/h (25 R/h) | |
| 388. |
An ultrasonic testing technique in which the transducer element is not parallel to thetest surface is called: |
| A. | Angle beam testing |
| B. | Immersion testing |
| C. | Contact testing |
| D. | Through-transmission testing |
| Answer» B. Immersion testing | |
| 389. |
Sound velocity is described by which of the following relationships? |
| A. | Wavelength times frequency |
| B. | Wavelength divided by frequency |
| C. | Wavelength divided acoustic impedance |
| D. | Acoustic impedance divided by density |
| Answer» B. Wavelength divided by frequency | |
| 390. |
In ultrasonic testing, a liquid coupling medium between the crystal surface and the part surface is necessary because : |
| A. | Lubricant is required to minimize wear on the crystal surface |
| B. | An air interface between the crystal surface and the part surface would almost completely reflect the ultrasonic vibrations |
| C. | The crystal will not vibrate if placed directly in contact with the surface of the part being inspected |
| D. | The liquid is necessary to complete the electrical circuit in the search unit |
| Answer» C. The crystal will not vibrate if placed directly in contact with the surface of the part being inspected | |
| 391. |
A change in which of the following parameters would necessitate the construction of anew 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 | |
| 392. |
Abnormally large grain size in the test material may be indicated by: |
| A. | High levels of baseline noise, or hash |
| B. | High amplitude reflections between front and back surface echoes |
| C. | High amplitude, spurious echoes which are not repeatable |
| D. | Abnormally high back surface echo |
| Answer» B. High amplitude reflections between front and back surface echoes | |
| 393. |
A dark, jagged, linear indication appears on a radiograph of a casting. The area is a transition area between a thick and a thin section. This indication should be interpreted as: |
| A. | A hot tear |
| B. | A gas hole |
| C. | An unfused chaplet |
| D. | A spongy shrink |
| Answer» B. A gas hole | |
| 394. |
The tube current in milliamps multiplied by the time in seconds or minutes equals: |
| A. | Density |
| B. | Intensity |
| C. | Exposure |
| D. | Kilovoltage |
| Answer» D. Kilovoltage | |
| 395. |
Static marks are most often caused by: |
| A. | Film bent when inserted in a cassette or holder |
| B. | Foreign material or dirt imbedded in screens |
| C. | Scratches on lead foil screens |
| D. | Improper film handling techniques |
| Answer» E. | |
| 396. |
An advantage of a dual crystal search unit is that: |
| A. | There is no ‘dead zone’ |
| B. | There is no near surface resolution |
| C. | There is no near field |
| D. | All of the above are true |
| Answer» B. There is no near surface resolution | |
| 397. |
For direct contact magnetising methods, the magnetic field is oriented in whatdirection relative to the current direction? |
| A. | Parallel |
| B. | At 45o |
| C. | At 90o |
| D. | At 180o |
| Answer» D. At 180o | |
| 398. |
A seam would be classified as what type of discontinuity? |
| A. | Inherent |
| B. | Processing |
| C. | Service |
| D. | None of the above |
| Answer» C. Service | |
| 399. |
An important consideration when using a direct contact method is: |
| A. | Lifting power of the yoke |
| B. | Coil diameter |
| C. | Preventing arc burns |
| D. | Field strength adjacent to the coil inside diameter |
| Answer» D. Field strength adjacent to the coil inside diameter | |
| 400. |
According to ASTME 709-95 and API, in order to eliminate all contaminants, an appropriate cleaning shall be performed on all the surfaces to be examined and on a minimum of adjacent material: |
| A. | 25.4 mm (1 inch) |
| B. | 31.7 mm (5/4 inches) |
| C. | 38.1 mm (1.5 inches) |
| D. | 44.5 mm (7/4 inches) |
| Answer» B. 31.7 mm (5/4 inches) | |