McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
Chapters
| 251. |
The residual method is applicable to: |
| A. | Surface discontinuities only |
| B. | Subsurface discontinuities only |
| C. | Either surface or subsurface discontinuities |
| D. | All but tight surface cracks |
| Answer» A. Surface discontinuities only | |
| 252. |
Highest sensitivity to fine surface cracks would be obtained by which of the following techniques? |
| A. | Residual field, wet method |
| B. | Residual field, dry method |
| C. | Continuous field, wet method |
| D. | Continuous field, dry method |
| Answer» C. Continuous field, wet method | |
| 253. |
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» B. The magnetic field, as shown by a hysteresis curve, is less when there is no magnetising force | |
| 254. |
Where possible, circular magnetisation is preferable to longitudinal magnetization because: |
| 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» D. None of the above is true | |
| 255. |
Which of the following is a disadvantage of the dry method? |
| A. | Ease of application with portable equipment |
| B. | Superior sensitivity for fine surface cracks |
| C. | Good particle mobility with AC and HWDC |
| D. | Good sensitivity for subsurface discontinuities |
| Answer» B. Superior sensitivity for fine surface cracks | |
| 256. |
Which of the following is an advantage of the dry method |
| A. | Good sensitivity for subsurface discontinuities |
| B. | Faster than wet method for quantities of small test pieces |
| C. | Easily applied in an automated system |
| D. | Easy coverage of surfaces of irregularly shaped test pieces |
| Answer» A. Good sensitivity for subsurface discontinuities | |
| 257. |
Loss of fine particle sizes due to re-use of dry particles would probably lead to: |
| A. | Loss of sensitivity to larger discontinuities |
| B. | Loss of sensitivity to finer discontinuities |
| C. | Unpredictable results |
| D. | Slower inspection speeds |
| Answer» B. Loss of sensitivity to finer discontinuities | |
| 258. |
Which of the following is a disadvantage of the wet method? |
| A. | It is the most sensitive method for detection of very fine surface cracks |
| B. | Rapid testing of large quantities of small test pieces |
| C. | Readily adaptable to mechanised equipment |
| D. | Excellent detection of completely subsurface discontinuities |
| Answer» D. Excellent detection of completely subsurface discontinuities | |
| 259. |
Which of the following is an advantage of the wet method? |
| A. | Excellent detection of completely subsurface discontinuities |
| B. | Ease of bath recovery and re-use |
| C. | Low flash point ensures freedom from fire hazards |
| D. | Relatively clean and easy to work with |
| Answer» B. Ease of bath recovery and re-use | |
| 260. |
The primary reason for using water rather than oil as a suspension medium for wet method 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» B. Bath flammability hazards are eliminated | |
| 261. |
A disadvantage of fluorescent magnetic particles is: |
| A. | Darkened area and black light are required |
| B. | Abnormally high sensitivity |
| C. | Only dry particles are available |
| D. | Only wet concentrate is available |
| Answer» A. Darkened area and black light are required | |
| 262. |
A common physiological effect of black light inspection on the inspector is: |
| A. | Burned retinas of the eyes |
| B. | Rejected cornea syndrome |
| C. | Eye fatigue |
| D. | Retarded iris control |
| Answer» C. Eye fatigue | |
| 263. |
A common physiological effect of black light inspection on the inspector is: |
| A. | Burned retinas of the eyes |
| B. | Rejected cornea syndrome |
| C. | Eyeball fluorescence |
| D. | Retarded iris control |
| Answer» C. Eyeball fluorescence | |
| 264. |
Which of the following represents ultraviolet light of wavelengths which are potentially injurious (1 Å = 10-10m) |
| A. | 2000 to 3200Å |
| B. | 3200 to 4000 Å |
| C. | 4000 to 4600Å |
| D. | 4600 to 5200 Å |
| Answer» A. 2000 to 3200Å | |
| 265. |
Dyes which receive light at one wavelength and re-emit light of another wavelength are called: |
| A. | L.E.Ds |
| B. | Phosphorescent |
| C. | Luminescent |
| D. | Fluorescent |
| Answer» D. Fluorescent | |
| 266. |
Most fluorescent dyes used for magnetic particle testing fluoresce what colour? |
| A. | Blue green |
| B. | Yellow green |
| C. | Blue black |
| D. | Red orange |
| Answer» B. Yellow green | |
| 267. |
The best available source of black light for inspection is: |
| A. | The mercury vapour lamp |
| B. | The fluorescent tube |
| C. | The incandescent bulb |
| D. | Sunlight |
| Answer» A. The mercury vapour lamp | |
| 268. |
Which of the following would be likely to cause variations in the output of an inspection black light? |
| A. | Voltage fluctuations |
| B. | Aged bulb |
| C. | Dirty filter |
| D. | All of the above |
| Answer» D. All of the above | |
| 269. |
The temperature above which steels become nonmagnetic is called the: |
| A. | Zero retentivity |
| B. | Curie point |
| C. | Demagnetisation temperature |
| D. | Random polar point |
| Answer» B. Curie point | |
| 270. |
The temperature above which most soft steels become nonmagnetic is about: |
| A. | 440ºC(770oF) |
| B. | 523ºC (975ºF) |
| C. | 626ºC (1160ºF) |
| D. | 754ºC (1390ºF) |
| Answer» D. 754ºC (1390ºF) | |
| 271. |
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» C. Passing through an AC coil | |
| 272. |
Demagnetisation with reversing DC is more effective than AC because: |
| A. | DC is more penetrating |
| B. | Demagnetisation is assisted by the skin effect |
| C. | DC is more direct |
| D. | Not true - AC is more effective |
| Answer» A. DC is more penetrating | |
| 273. |
The type of discontinuity which magnetic particle testing most effectively locates is: |
| A. | Slag inclusions |
| B. | Magnetic writing |
| C. | Porosity |
| D. | Surface cracks |
| Answer» D. Surface cracks | |
| 274. |
An indication which is formed when two pieces of magnetised steel come in contact with each other is called: |
| A. | A metallurgical discontinuity |
| B. | Magnetic writing |
| C. | Magnetic transfer |
| D. | A ferromagnetic notch |
| Answer» B. Magnetic writing | |
| 275. |
Magnetic particle test indications which are due to cold work can best be removed by: |
| A. | Demagnetisation |
| B. | Using a lower current |
| C. | Re-crystallisation |
| D. | Heat treating |
| Answer» D. Heat treating | |
| 276. |
Which of the following might cause non-relevant indications? |
| A. | Over magnetisation |
| B. | Indications at the edges of a braze joint |
| C. | A joint between hard and soft steels |
| D. | All of the above |
| Answer» D. All of the above | |
| 277. |
An inspection for surface and subsurface discontinuities in ferromagnetic welds would best be accomplished by which of the following techniques? |
| A. | Prods |
| B. | AC yoke |
| C. | Half wave DC yoke |
| D. | None of the above |
| Answer» A. Prods | |
| 278. |
A continuous linear indication along the centre of a fillet weld would most likely be a: |
| A. | Crater crack |
| B. | Overlap |
| C. | Root indication |
| D. | None of the above |
| Answer» C. Root indication | |
| 279. |
Wet magnetic particle bath strength is checked by which of the following? |
| A. | Specific gravity |
| B. | Optical density |
| C. | Settling test |
| D. | None of the above |
| Answer» C. Settling test | |
| 280. |
Which of the following describes the best technique for applying dry magnetic particles to a test piece? |
| A. | Dip the test piece in a tank of dry particles while current is flowing |
| B. | Apply with an electrostatic spray gun at approximately 30 PSIG |
| C. | Gently pour the powder onto the test piece |
| D. | Shake or dust the powder onto the test piece with minimum velocity |
| Answer» D. Shake or dust the powder onto the test piece with minimum velocity | |
| 281. |
An advantage of AC equipment over DC is: |
| A. | AC is more penetrating |
| B. | AC is less hazardous |
| C. | AC makes the magnetic particles more mobile on the test surface |
| D. | AC equipment is heavier than DC |
| Answer» C. AC makes the magnetic particles more mobile on the test surface | |
| 282. |
When the orientation of likely discontinuities is unknown, what is the minimum number of magnetising operations required to perform an adequate test? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | None of the above |
| Answer» B. 2 | |
| 283. |
Maximum practical prod spacing is about: |
| A. | 100 mm |
| B. | 200 mm |
| C. | 300 mm |
| D. | 450 mm |
| Answer» B. 200 mm | |
| 284. |
Magnetic lines of flux which are parallel to a discontinuity produce: |
| A. | Strong indications |
| B. | Weak indications |
| C. | No indications |
| D. | Fuzzy indications |
| Answer» C. No indications | |
| 285. |
The area of maximum induced field strength using a yoke is: |
| A. | At the north pole of the yoke |
| B. | At the south pole of the yoke |
| C. | The area directly between the poles |
| D. | On the outside of the pole pieces |
| Answer» C. The area directly between the poles | |
| 286. |
A minimum of external poles are produced by what type of magnetisation? |
| A. | Continuous |
| B. | Residual |
| C. | Circular |
| D. | Longitudinal |
| Answer» C. Circular | |
| 287. |
A split coil would most likely be used with a: |
| A. | DC yoke |
| B. | Split phase AC yoke |
| C. | Stationary magnetic particle unit |
| D. | Portable magnetic particle unit |
| Answer» D. Portable magnetic particle unit | |
| 288. |
The most common harmful effect of exposure to black light is: |
| A. | Eyeball fluorescence |
| B. | Burned retinas |
| C. | Skin burns |
| D. | None of the above |
| Answer» A. Eyeball fluorescence | |
| 289. |
Which of the following types of magnetic fields may be present without any external evidence? |
| A. | Circular |
| B. | Longitudinal |
| C. | Secondary |
| D. | Tertiary |
| Answer» A. Circular | |
| 290. |
The primary reason for using water rather than oil as a suspension medium for wet method 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 a lower temperature than oil baths |
| Answer» B. Bath flammability hazards are eliminated | |
| 291. |
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» C. Settling test | |
| 292. |
A residual circular field may be objectionable because: |
| A. | Grinding may produce heat cracks |
| B. | Machining may create external poles |
| C. | Heat treating may lead to tight surface cracks\ |
| D. | All of the above |
| Answer» B. Machining may create external poles | |
| 293. |
A prod method would be most sensitive to cracks: |
| A. | Parallel to a line connecting the prod contract points |
| B. | Tangential to a radius from each prod contact point |
| C. | Perpendicular to a line connecting the prod contact points |
| D. | Perpendicular to the long axis |
| Answer» A. Parallel to a line connecting the prod contract points | |
| 294. |
Maximum practical prod spacing for a 2000 amp unit is about: |
| A. | 100 mm |
| B. | 200 mm |
| C. | 300 mm |
| D. | 450 mm |
| Answer» B. 200 mm | |
| 295. |
Demagnetisation with reversing DC is more effective than AC because: |
| A. | DC is more penetrating |
| B. | Demagnetisation is assisted by the skin effect |
| C. | DC is more direct |
| D. | Not true-AC is more effective |
| Answer» A. DC is more penetrating | |
| 296. |
Fluorescent magnetic particle indications should be inspected under |
| A. | Fluorescent light |
| B. | Any light |
| C. | Black light |
| D. | Red light |
| Answer» C. Black light | |
| 297. |
Cracks which are caused by a combination of tensile stress and corrosion are called: |
| A. | Intergranular stress corrosion cracking |
| B. | Cycling cracks |
| C. | Stress corrosion cracking |
| D. | Fatigue cracks |
| Answer» C. Stress corrosion cracking | |
| 298. |
The type of discontinuity potentially most harmful to the useful life of a part is: |
| A. | Slag inclusions |
| B. | Magnetic writing |
| C. | Porosity |
| D. | Surface cracks |
| Answer» D. Surface cracks | |
| 299. |
Magnetic particle test indications which are due to cold work can best be removed by: |
| A. | Demagnetisation |
| B. | Using a lower current |
| C. | Using penetrant testing |
| D. | Re-heat treating |
| Answer» D. Re-heat treating | |
| 300. |
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» D. All of the above | |
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