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.
| 251. |
Which of the following is the most desirable method of pre-cleaning a test piece priorto penetrant testing? |
| A. | Sand blasting |
| B. | Vapour degreasing |
| C. | Emery cloth |
| D. | Wire brushing |
| Answer» C. Emery cloth | |
| 252. |
Opposition to establishment of a magnetic field in a test piece is called: |
| A. | Reluctance |
| B. | Retentivity |
| C. | Permeability |
| D. | Electromagnetism |
| Answer» B. Retentivity | |
| 253. |
A thin, jagged, dark line inside the weld image on a radiographic film is probably: |
| A. | Incomplete penetration |
| B. | Lack of fusion |
| C. | Burn through |
| D. | A crack |
| Answer» E. | |
| 254. |
According to ASTM E709-95, Table 3., alternating current electromagnetic yokesmust have a lifting force of at least: |
| A. | 3.0 kg (7 lb) |
| B. | 3.5 kg (8 lb) |
| C. | 4.0 kg (9 lb) |
| D. | 4.5 kg (10 lb) |
| Answer» E. | |
| 255. |
A weld discontinuity which consists of unmelted joint surfaces at the root, and whichmay be caused by poor fit- up, is called: |
| A. | Hot short cracking |
| B. | A slag inclusion |
| C. | Incomplete penetration |
| D. | Burn through |
| Answer» D. Burn through | |
| 256. |
A developer aids penetrant bleed out because of: |
| A. | Adequate removal of the excess penetrant |
| B. | Providing a contrasting background for visible dye indications |
| C. | Capillary action |
| D. | Proper emulsifier action |
| Answer» D. Proper emulsifier action | |
| 257. |
Liquid penetrant testing is based on the principle of: |
| A. | Polarized sound waves in a liquid |
| B. | Magnetic domains |
| C. | Absorption of X rays |
| D. | Capillary action |
| Answer» E. | |
| 258. |
A densitometer is an instrument that measures: |
| A. | Radiographic contrast |
| B. | Radiographic sensitivity |
| C. | Radiographic density |
| D. | Radiographic resolution |
| Answer» D. Radiographic resolution | |
| 259. |
A quantity calculated by the formula, 0.693/(decay constant), is called: |
| A. | Half value layer |
| B. | Mass attenuation constant |
| C. | Half-life |
| D. | Specific activity |
| Answer» D. Specific activity | |
| 260. |
Prods are being used to magnetize a weld area. When dry powder is dusted on the surface, it is observed that there is no mobility of the particles. What is the most probable reason for this observation? |
| A. | The magnetizing current is not high enough |
| B. | The flux density is too low |
| C. | DC is being used |
| D. | All of the above are possible reasons |
| Answer» E. | |
| 261. |
The magnetic particles are noticed to bunch in some fillet areas and stand on end onthe edge of a part being magnetized. These observations indicate that the: |
| A. | Particle concentration is too low |
| B. | Flux density is excessive |
| C. | Flux density is too low |
| D. | Magnetizing current should be changed form AC to DC |
| Answer» C. Flux density is too low | |
| 262. |
Which type of penetrant process affords most control of test sensitivity level? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» D. Fluorescent | |
| 263. |
The term used to describe the reaction of human cells, other than reproductive cells, toionizing radiation is: |
| A. | Genetic effects |
| B. | Somatic effects |
| C. | Corpuscular effects |
| D. | Hematological effects |
| Answer» C. Corpuscular effects | |
| 264. |
What governs the penetrating power of an X ray beam? |
| A. | Kilovoltage |
| B. | Time |
| C. | Activity |
| D. | Milliamperage |
| Answer» B. Time | |
| 265. |
The silver nitrate spot test can be used to: |
| A. | Check the film for film quality |
| B. | Check for under developed films |
| C. | Check for film artifacts |
| D. | All the above answers are correct |
| Answer» B. Check for under developed films | |
| 266. |
According to ASTM E709-95 demagnetization can be performed by: |
| A. | Decreasing alternating current |
| B. | Reversing direct current |
| C. | All of the above |
| D. | None of the above |
| Answer» D. None of the above | |
| 267. |
The advantages of using a visible solvent removable penetrant versus a postemulsified fluorescent penetrant is: |
| A. | No UV light is needed |
| B. | The technique is well suitable for site tests or spot checks |
| C. | No water or emulsifiers are needed |
| D. | No extra equipment is needed |
| Answer» E. | |
| 268. |
Lead foil is placed behind the films to: |
| A. | Absorb as much side scatter as possible |
| B. | Reduce non image forming back-scatter |
| C. | Reduce the quality of image-forming primary rays |
| D. | Limit the amount of light striking the film. |
| Answer» C. Reduce the quality of image-forming primary rays | |
| 269. |
A lamination in steel plate would be classified as what type of discontinuity? |
| A. | Inherent |
| B. | Processing |
| C. | Service |
| D. | None of the above |
| Answer» C. Service | |
| 270. |
A more highly damped transducer crystal results in: |
| A. | Better resolution |
| B. | Better sensitivity |
| C. | Lower sensitivity |
| D. | Poorer resolution |
| Answer» B. Better sensitivity | |
| 271. |
Which of the following welding discontinuities would be considered the most serious? |
| A. | Porosity |
| B. | Incomplete penetration |
| C. | Crack |
| D. | Slag inclusions |
| Answer» D. Slag inclusions | |
| 272. |
Paramagnetic materials: |
| A. | Are commonly inspected using magnetic particle testing |
| B. | Are affected by magnetic fields |
| C. | Cannot be magnetized |
| D. | Have low reluctance to establishment of magnetic flux |
| Answer» C. Cannot be magnetized | |
| 273. |
A divergent sound beam is produced by: |
| A. | Concave mirror |
| B. | Convex mirror |
| C. | Convex lens |
| D. | None of the above |
| Answer» D. None of the above | |
| 274. |
Fluorescent screens are seldom used in industrial radiography because: |
| A. | Light leaks degrade the film image |
| B. | Film fogging can result if used in the vicinity of fluorescent lights |
| C. | Poor definition and screen mottle can result |
| D. | None of the above |
| Answer» D. None of the above | |
| 275. |
On the area-amplitude ultrasonic standard test blocks, the flat-bottomed holes in theblocks are: |
| A. | All of the same diameter |
| B. | Different in diameter, increasing by 1/64 inch increments from the No. 1 block to the No. 8 block |
| C. | Largest in the No. 1 block and smallest in the No. 8 block |
| D. | Drilled to different depths from the front surface of the test block |
| Answer» C. Largest in the No. 1 block and smallest in the No. 8 block | |
| 276. |
When using the wet continuous method, the flow of suspension from the hose shouldbe shut off: |
| A. | Immediately after applying the current |
| B. | Immediately before applying the current |
| C. | While the current is flowing |
| D. | Thirty seconds before applying the current |
| Answer» D. Thirty seconds before applying the current | |
| 277. |
When testing a test piece with parallel front and back surfaces, no back wall echo canbe obtained. Which of the following actions might enable you to obtain a back wall echo? |
| A. | Use a wetter transducer |
| B. | Use a lower frequency transducer |
| C. | Use a transducer with a narrower bandwidth |
| D. | Use a higher frequency transducer |
| Answer» C. Use a transducer with a narrower bandwidth | |
| 278. |
An expression which is used to describe the slope of a film characteristic curve is: |
| A. | Film latitude |
| B. | Film contrast |
| C. | Film sensitivity |
| D. | Film gradient |
| Answer» E. | |
| 279. |
Which of the following is not an advantage of an aqueous wet developer? |
| A. | It may be applied to a dry surface |
| B. | It has no hazardous vapours |
| C. | There is visible evidence of developer coverage |
| D. | During drying, only water evaporates, not costly solvents |
| Answer» B. It has no hazardous vapours | |
| 280. |
For detection of longitudinal discontinuities a 7.6 cm (3 inches) diameter bar ismagnetized in: |
| A. | The longitudinal direction |
| B. | The circular direction |
| C. | The clockwise direction |
| D. | None of the above directions |
| Answer» C. The clockwise direction | |
| 281. |
With current flowing from + to - in a coil, a longitudinal field is created. Which of thefollowing may be used to establish the direction of the magnetic field? |
| A. | Left hand rule |
| B. | Right hand rule |
| C. | Ohms law |
| D. | There is no relevant law |
| Answer» C. Ohms law | |
| 282. |
The ease with which a magnetic field can be established in a test piece is called: |
| A. | Reluctance |
| B. | Retentivity |
| C. | Permeability |
| D. | Electromagnetism |
| Answer» D. Electromagnetism | |
| 283. |
A disadvantage of AC current is that it: |
| A. | Cannot be used with dry powder |
| B. | Has poor penetrating power |
| C. | Can only provide low flux densities |
| D. | Cannot be used for residual magnetic particle testing |
| Answer» C. Can only provide low flux densities | |
| 284. |
AA term used in ultrasonics to express the rate at which sound waves pass throughvarious substances is: |
| A. | Frequency |
| B. | Velocity |
| C. | Wave length |
| D. | Pulse length |
| Answer» C. Wave length | |
| 285. |
Almost all gamma radiography is performed with: |
| A. | Tm-170 |
| B. | Natural isotopes |
| C. | Radium |
| D. | Ir-192 or Co-60 |
| Answer» E. | |
| 286. |
Which type of penetrant process is least susceptible to over washing? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» D. Fluorescent | |
| 287. |
At 61 cm (two feet) from a radiation source, radiation intensity is 3 Gy/h (300 R/h).What is the Intensity at 244 cm (8 feet) from the source? |
| A. | 0.12 Gy/h (12R/h) |
| B. | 1.2 Gy/h (120 R/h) |
| C. | 0.1875 Gy/h (18.75 R/h) |
| D. | 0.28 Gy/h (28 R/h) |
| Answer» D. 0.28 Gy/h (28 R/h) | |
| 288. |
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» C. Unpredictable results | |
| 289. |
The divergence of an ultrasonic beam is dependant on: |
| A. | Transducer wavelength and diameter |
| B. | Test specimen density |
| C. | The sound wave's angle of incidence |
| D. | The degree of damping of the ultrasonic transducer |
| Answer» B. Test specimen density | |
| 290. |
Which of the following is NOT a liquid vehicle in which particles are suspended inmagnetic particle testing: |
| A. | Water treated with a wetting agent |
| B. | Kerosene |
| C. | Gasoline |
| D. | Water treated with antifoam |
| Answer» D. Water treated with antifoam | |
| 291. |
Which type of penetrant process would be best suited to the detection of wide, shallowdiscontinuities? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» D. Fluorescent | |
| 292. |
When the motion of the particles of a medium is transverse to the direction ofpropagation, the wave being transmitted is called a: |
| A. | Longitudinal wave |
| B. | Shear wave |
| C. | Surface wave |
| D. | Lamb wave |
| Answer» C. Surface wave | |
| 293. |
The principle on which liquid penetrant testing is based on is: |
| A. | Capillary action of the penetrant |
| B. | Capillary action of cleaner/solvent |
| C. | Capillary action of developer |
| D. | None of the listed is correct |
| Answer» B. Capillary action of cleaner/solvent | |
| 294. |
Which pre-cleaning method may be used with either a solvent or a detergent solution? |
| A. | Ultrasonic cleaning |
| B. | Steam cleaning |
| C. | Detergent wash |
| D. | Vapour degreasing |
| Answer» B. Steam cleaning | |
| 295. |
What type of search unit allows the greatest resolving power with standard ultrasonictesting equipment? |
| A. | Delay tip |
| B. | Focused |
| C. | Highly damped |
| D. | High Q |
| Answer» C. Highly damped | |
| 296. |
Most scattered radiation which adversely affects the radiographic image qualityoriginates: |
| A. | From floors and walls adjacent to the test piece |
| B. | From other nearby objects |
| C. | From the test piece itself |
| D. | From the lead intensifying screens |
| Answer» B. From other nearby objects | |
| 297. |
An advantage of using a ceramic transducer in search units is that: |
| A. | It is one of the most efficient generators of ultrasonic energy |
| B. | It is one of the most efficient receivers of ultrasonic energy |
| C. | It has a very low mechanical impedance |
| D. | It can withstand temperatures as high as 700oC |
| Answer» B. It is one of the most efficient receivers of ultrasonic energy | |
| 298. |
It is possible for a discontinuity smaller than the transducer to produce indications offluctuating amplitude as the search unit is moved laterally if testing is being performed in the: |
| A. | Fraunhofer zone |
| B. | Near field |
| C. | Snell field |
| D. | Shadow zone |
| Answer» C. Snell field | |
| 299. |
What is a disadvantage of the solvent removable penetrant process? |
| A. | It is the least sensitive of the penetrant processes |
| B. | It is not well suited for use on rough surfaces |
| C. | It is highly portable |
| D. | No water is required for its use |
| Answer» C. It is highly portable | |
| 300. |
For a 7.6 cm (3 inches) diameter bar how much current is needed to magnetize the barfor the detection of longitudinal discontinuities: |
| A. | 5500 amperes |
| B. | 16500 amperes |
| C. | 1000 amperes |
| D. | 3000 amperes |
| Answer» E. | |