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.
| 401. |
A wetting agent is used in film processing to: |
| A. | More closely control development |
| B. | Prevent formation of water marks during the drying stage |
| C. | Reduce formation of air bubbles in the developer solution |
| D. | Reduce formation of air bubbles in the fixer |
| Answer» C. Reduce formation of air bubbles in the developer solution | |
| 402. |
How is the magnetic field strength, F, just outside a magnetic conductor having permeability, µ, related to that just outside a nonmagnetic conductor of the same size, carrying the same current? |
| A. | F × µ |
| B. | Same |
| C. | (F)/µ |
| D. | Not related |
| Answer» C. (F)/µ | |
| 403. |
The piezoelectric material in a search unit which vibrates to produce ultrasonic wavesis called: |
| A. | A backing material |
| B. | A lucite wedge |
| C. | A transducer element or crystal |
| D. | A couplant |
| Answer» D. A couplant | |
| 404. |
Greater depth of penetration in coarse grained material may be achieved using: |
| A. | More sweep delay |
| B. | Higher frequencies |
| C. | Less sweep delay |
| D. | Lower frequencies |
| Answer» E. | |
| 405. |
According to ASTM E709-95 the alkalinity of conditioned water shall not exceed: |
| A. | 10.0 pH |
| B. | 10.5 pH |
| C. | 11.0 pH |
| D. | 11.5 pH |
| Answer» C. 11.0 pH | |
| 406. |
Which of the following pre-cleaning processes is not recommended? |
| A. | Detergent cleaning |
| B. | Vapour degreasing |
| C. | Shot blasting |
| D. | Ultrasonic cleaning |
| Answer» D. Ultrasonic cleaning | |
| 407. |
Which of the following is not a property of magnetic lines of force? |
| A. | They form closed loops which do not cross |
| B. | The density increases with distance from the poles of a permanent magnet |
| C. | Hey are considered to have direction |
| D. | They seek paths of least magnetic resistance or least reluctance |
| Answer» C. Hey are considered to have direction | |
| 408. |
The intensifying effect of lead screens is mainly caused by: |
| A. | X ray generated by the lead screens |
| B. | Fluorescence of the lead screens |
| C. | Excited electrons |
| D. | The Maxwell effect |
| Answer» D. The Maxwell effect | |
| 409. |
A reaction which occurs when a radiation beam of 15 MeV is partially absorbed by atest piece would probably be: |
| A. | The Compton effect |
| B. | The photoelectric effect |
| C. | Pair production |
| D. | Any of the above |
| Answer» D. Any of the above | |
| 410. |
The formula, NI = 45000/(L/D), is used to calculate the proper magnetising currentfor: |
| A. | Prod magnetization |
| B. | A head shot |
| C. | A central conductor |
| D. | Coil magnetisation |
| Answer» E. | |
| 411. |
The unit usually used to denote flux density is the: |
| A. | Henry |
| B. | Angstrom |
| C. | Gauss |
| D. | Ampere |
| Answer» D. Ampere | |
| 412. |
When a ferromagnetic material is in an unmagnetized state, the domains are: |
| A. | Aligned in a North and South direction |
| B. | Aligned in an East West direction |
| C. | Randomly organized |
| D. | Balanced to produce a gauss rating of 2 |
| Answer» D. Balanced to produce a gauss rating of 2 | |
| 413. |
Wet magnetic bath 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 | |
| 414. |
Which of the following is the most common type of X ray tube? |
| A. | Bipolar |
| B. | Unipolar |
| C. | Long anode |
| D. | None of the above |
| Answer» B. Unipolar | |
| 415. |
Which of the following are potential sources of scattered radiation? |
| A. | Test piece |
| B. | Cassette |
| C. | Floor |
| D. | All of the above |
| Answer» E. | |
| 416. |
A soft aluminium test piece is to be penetrant tested. The piece has previously been sand blasted to remove tightly adhering soils. What additional surface preparation should be performed? |
| A. | Etching |
| B. | Solvent cleaning |
| C. | Ultrasonic cleaning |
| D. | Grinding |
| Answer» D. Grinding | |
| 417. |
The scattering of the rays of an ultrasonic beam due to reflection from a highlyirregular surface is called: |
| A. | Angulation |
| B. | Dispersion |
| C. | Refraction |
| D. | Diffraction |
| Answer» E. | |
| 418. |
Cobalt-60 is produced by: |
| A. | Fission of Uranium-235 |
| B. | Neutron capture by Cobalt-59 |
| C. | Radioactive decay |
| D. | None of the above |
| Answer» C. Radioactive decay | |
| 419. |
An ultrasonic wave in which particle displacement is 90 degrees to the direction ofwave propagation is called a: |
| A. | Longitudinal wave |
| B. | Shear wave |
| C. | Compressional wave |
| D. | Plate wave |
| Answer» C. Compressional wave | |
| 420. |
A thin, white line within the film image of a weld crown might be: |
| A. | A hair between the lead screen and the film |
| B. | Incomplete penetration |
| C. | A crack |
| D. | Undercut |
| Answer» B. Incomplete penetration | |
| 421. |
Laminations would most likely be encountered in which of the following productforms? |
| A. | Forgings |
| B. | Hot rolled plate |
| C. | Castings |
| D. | Welds |
| Answer» C. Castings | |
| 422. |
Co-59 becomes Co-60 when it is placed in a nuclear reactor where it captures: |
| A. | A proton |
| B. | Contamination |
| C. | Neutron |
| D. | An electron |
| Answer» D. An electron | |
| 423. |
Flaw sizing by the 6 dB drop technique is applicable to: |
| A. | Large flaws relative to the sound beam |
| B. | Small flaws relative to the sound beam |
| C. | Any flaws |
| D. | None of the above |
| Answer» B. Small flaws relative to the sound beam | |
| 424. |
Fluorescent penetrant indications are more visible than colour contrast penetrantindications because: |
| A. | They reflect more light |
| B. | They emit rather than reflect light |
| C. | They contain a higher concentration of dye particles |
| D. | Yellow and green contrast more than red and white |
| Answer» C. They contain a higher concentration of dye particles | |
| 425. |
The most effective NDT method for locating surface cracks in ferromagnetic materialsis: |
| A. | Ultrasonic testing |
| B. | Radiographic testing |
| C. | Magnetic particle testing |
| D. | Liquid penetrant testing |
| Answer» D. Liquid penetrant testing | |
| 426. |
AA display which shows the initial pulse and the front surface echo with a fairly widespace between the two would be considered: |
| A. | An immersion test |
| B. | An A scan |
| C. | A contact test |
| D. | A B scan |
| Answer» B. An A scan | |
| 427. |
The result of filtering the X rays is to produce: |
| A. | More geometric unsharpness |
| B. | Less geometric unsharpness |
| C. | Softer radiation |
| D. | Harder radiation |
| Answer» E. | |
| 428. |
Which brings out surface indications most clearly? |
| A. | AC |
| B. | DC |
| C. | Pulsed DC |
| D. | DC with surge |
| Answer» B. DC | |
| 429. |
The half-life of Co-60 is approximately: |
| A. | 74 days |
| B. | 129 days |
| C. | 5.3 years |
| D. | 30.1 years |
| Answer» D. 30.1 years | |
| 430. |
Dark crescent-shaped indications on a radiographic film are most likely caused by: |
| A. | Crimping film after exposure |
| B. | Crimping film before exposure |
| C. | Sudden extreme temperature change while processing |
| D. | Warm or exhausted fixer |
| Answer» B. Crimping film before exposure | |
| 431. |
‘25 million cycles per second’ can also be stated as: |
| A. | 25 kHz |
| B. | 2500 kHz |
| C. | 25 MHz |
| D. | 25 Hz |
| Answer» D. 25 Hz | |
| 432. |
The longitudinal wave incident angle at which the refracted shear wave angle equalsninety degrees is called: |
| A. | The Snell angle |
| B. | The Snell constant |
| C. | The first critical angle |
| D. | The second critical angle |
| Answer» E. | |
| 433. |
Acoustic impedance is defined by which of the following relations? |
| A. | Material density/wavelength |
| B. | Material density × velocity |
| C. | Velocity/wavelength |
| D. | Velocity × wavelength |
| Answer» C. Velocity/wavelength | |
| 434. |
Where possible, circular magnetisation is preferable to longitudinal magnetizationbecause: |
| A. | Less current is required |
| B. | Stronger fields are obtained |
| C. | Fewer confusing secondary poles are produced |
| D. | None of the above is true |
| Answer» E. | |
| 435. |
When viewed under black light, developer appears: |
| A. | Yellow-green |
| B. | Blue-black |
| C. | White |
| D. | Pinkish white |
| Answer» C. White | |
| 436. |
What is the likely result of looking directly into a black light? |
| A. | Burning of the retina of the eye |
| B. | Temporary inflammation of the cornea |
| C. | Long term tendency toward formation of cataracts |
| D. | Fluorescence of the fluid in the eye |
| Answer» E. | |
| 437. |
Gas discontinuities are reduced to flat discs or other shapes parallel to the surface by: |
| A. | Rolling |
| B. | Machining |
| C. | Casting |
| D. | Welding |
| Answer» B. Machining | |
| 438. |
AA standard block which can be used to calibrate an instrument for an angle beamrange calibration is: |
| A. | Area-amplitude blocks |
| B. | Distance-amplitude blocks |
| C. | V1/A2 block |
| D. | Beam spread block |
| Answer» D. Beam spread block | |
| 439. |
Penetrant developers are used in which of the following forms? |
| A. | Water washable |
| B. | Water suspendable |
| C. | Solvent suspendable |
| D. | All of the above |
| Answer» E. | |
| 440. |
An ultrasonic data display which shows a plan view presentation of the data is called: |
| A. | A scan |
| B. | B scan |
| C. | C scan |
| D. | Orthogonal view |
| Answer» D. Orthogonal view | |
| 441. |
The penetrant process best suited for use on parts with keyways and threads is: |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | None of the above |
| Answer» C. Post emulsifiable | |
| 442. |
When applied by immersion, an optimum concentration for a hydrophilic emulsifier is about: |
| A. | 0.5–2% |
| B. | 80–100% |
| C. | 2.5–20% |
| D. | 50–80% |
| Answer» D. 50–80% | |
| 443. |
Typical immersion test frequencies for wrought aluminium are: |
| A. | 10 MHz and up |
| B. | 5 MHz and below |
| C. | 500 MHz to 1 MHz |
| D. | Above 25 MHz |
| Answer» B. 5 MHz and below | |
| 444. |
The most common method of demagnetising small test pieces is: |
| A. | Heat treatment |
| B. | Shot peening |
| C. | Passing through an AC coil |
| D. | Direct contact with AC current |
| Answer» D. Direct contact with AC current | |
| 445. |
Which of the following is the most durable piezoelectric material? |
| A. | Barium titanate |
| B. | Quartz |
| C. | Dipotassoium tartrate |
| D. | Rochelle salt |
| Answer» C. Dipotassoium tartrate | |
| 446. |
When a sound beam is incident on an acoustic interface at some angle other than normalincidence, which of the following occurs? |
| A. | Reflection |
| B. | Refraction |
| C. | Mode conversion |
| D. | All of the above |
| Answer» E. | |
| 447. |
The gamma factor of Cs-137 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-1 at one metre |
| Answer» E. | |
| 448. |
What method provides greater sensitivity, particularly in locating subsurfacediscontinuities?: |
| A. | Continuous |
| B. | Residual |
| C. | Circular |
| D. | Longitudinal |
| Answer» B. Residual | |
| 449. |
The 2 mm wide notch in the IIW block is used to: |
| A. | Determine beam index point |
| B. | Check resolution |
| C. | Calibrate angle beam distance |
| D. | Check beam angle |
| Answer» C. Calibrate angle beam distance | |
| 450. |
Which of the following discontinuity types could typically be found with a liquidpenetrant test? |
| A. | Internal slag in a weld |
| B. | Internal slag in a casting |
| C. | Sensitization in austenitic stainless steel |
| D. | Fatigue cracks |
| Answer» E. | |