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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.
| 201. |
The amount of amperage used for magnetic particle inspection using the prod methodis determined from the: |
| A. | Type of material |
| B. | Distance between the prods |
| C. | Diameter of the part |
| D. | Total length of the part |
| Answer» C. Diameter of the part | |
| 202. |
A Curie (37 gigabecquerel)of radioactive material will disintegrate at the rate of: |
| A. | 37 million (3.7 × 107) disintegrations per second |
| B. | 37 billion (3.7 × 1010) disintegrations per second |
| C. | 37 trillion (3.7 × 1013) disintegrations per second |
| D. | None of the above |
| Answer» C. 37 trillion (3.7 × 1013) disintegrations per second | |
| 203. |
Magnetic lines of force: |
| A. | Travel in straight lines |
| B. | Form a closed loop |
| C. | Are randomly oriented |
| D. | Overlay in highly ferromagnetic materials |
| Answer» C. Are randomly oriented | |
| 204. |
In steel, the velocity of sound is greatest in which of the following modes ofvibration? |
| A. | Longitudinal |
| B. | Shear |
| C. | Surface wave |
| D. | Sound velocity is identical in all modes, in a given material |
| Answer» B. Shear | |
| 205. |
Which of the following circuits provides timing signals to the pulser? |
| A. | The clock |
| B. | The amplifier |
| C. | The pulse generator |
| D. | The sweep generator |
| Answer» B. The amplifier | |
| 206. |
A A disadvantage of using a high frequency ultrasonic transducer is: |
| A. | It provides a smaller beam angle and better resolving power |
| B. | It provides a larger beam angle and poorer resolving power |
| C. | It is scattered more by coarse grained material |
| D. | It is scattered less by coarse grained material |
| Answer» D. It is scattered less by coarse grained material | |
| 207. |
The selection of the proper source-to-film distance is a primary factor in controlling: |
| A. | Contrast |
| B. | Unsharpness |
| C. | Graininess |
| D. | Scatter |
| Answer» C. Graininess | |
| 208. |
How will the excess surface penetrant be removed if a post emulsified penetrant wasused: |
| A. | Dip or spray emulsifier onto part |
| B. | Wait correct dwell time |
| C. | Water wash part observing correct recommended rules |
| D. | Dry part and apply developer |
| Answer» D. Dry part and apply developer | |
| 209. |
Which of the following developers is applied by immersion or flow on only? |
| A. | Non-aqueous wet |
| B. | Water based wet |
| C. | Dry |
| D. | Dual sensitivity |
| Answer» C. Dry | |
| 210. |
A quantity expressed by the formula, 0.693/(absorption co-efficient) is called: |
| A. | Half value layer |
| B. | Mass attenuation constant |
| C. | Half-life |
| D. | Specific activity |
| Answer» B. Mass attenuation constant | |
| 211. |
If the required exposure time for a 1850 GBq (50 curie) Ir-192 source is 4 minutes,what exposure time would be required for 925 GBq (25 curie) source: |
| A. | 4 minutes |
| B. | 8 minutes |
| C. | 2 minutes |
| D. | 16 minutes |
| Answer» C. 2 minutes | |
| 212. |
The most sensitive type of developer for the detection of fine discontinuities is: |
| A. | Water soluble |
| B. | Non-aqueous wet |
| C. | Dry |
| D. | Water suspendable |
| Answer» C. Dry | |
| 213. |
Which of the following types of penetrants, developers, solvents are used when conducting a liquid penetrant test on a part that is exposed to a liquid oxygen environment. |
| A. | Water based penetrants |
| B. | Water based developers |
| C. | Water based solvents |
| D. | All of the above |
| Answer» B. Water based developers | |
| 214. |
Which type(s) of sound wave modes will propagate through solids? |
| A. | Longitudinal |
| B. | Shear |
| C. | Surface |
| D. | All of the above |
| Answer» E. | |
| 215. |
Lower frequency transducers produce: |
| A. | Deeper penetration, greater attentuation and less beam spread |
| B. | Deeper penetration, less attentuation and greater beam spread |
| C. | Greater beam spread but higher sensitivity and resolution |
| D. | Less beam spread but lower sensitivity and resolution |
| Answer» C. Greater beam spread but higher sensitivity and resolution | |
| 216. |
Which penetrant process is best suited to the detection of discontinuities in a test piecehaving threads and keyways? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» C. Post emulsifiable | |
| 217. |
Which of the following is a function of a developer? |
| A. | Providing a contrasting background for visible dye indications |
| B. | Accentuates presence of discontinuities by causing a penetrant indication to spread out over a larger area |
| C. | Provides capillary paths to aid the bleed out process |
| D. | All of the above |
| Answer» E. | |
| 218. |
Which of the following statements should be true to achieve the highest level ofradiographic sharpness (definition)? |
| A. | The focal spot should be as small as practicable |
| B. | The focal spot to test piece distance should be as large as practicable |
| C. | The film to test piece distance should be as small as practicable |
| D. | All of the above |
| Answer» E. | |
| 219. |
The danger of over washing during a water washable penetrant test is that: |
| A. | Excess penetrant will be removed from the test piece |
| B. | Penetrant will be removed from discontinuities |
| C. | The waste water will contain too high a concentration of penetrants |
| D. | A protective oxide coating on the test piece is formed |
| Answer» C. The waste water will contain too high a concentration of penetrants | |
| 220. |
The opposition that a ferromagnetic material shows to the establishment of a magneticfield is called: |
| A. | Retentivity |
| B. | Reluctance |
| C. | Coercive force |
| D. | Permeability |
| Answer» C. Coercive force | |
| 221. |
Selection of magnetic particle colour is based on: |
| A. | Optimum performance of magnetic particle/developer |
| B. | Colour of inspection light available |
| C. | Obtaining maximum contrast with the test piece background |
| D. | Optimum colour response of the human eye |
| Answer» D. Optimum colour response of the human eye | |
| 222. |
Reticulation may be the result of: |
| A. | Inadequate agitation of the film during development |
| B. | Inadequate water rinse during processing |
| C. | Using exhausted stop bath solution |
| D. | Developing solutions not maintained at the same temperatures. |
| Answer» E. | |
| 223. |
Hydrophilic emulsifier contact time depends on which of the following? |
| A. | Surface finish of test piece |
| B. | Emulsifier concentration |
| C. | Method of application |
| D. | All of the above |
| Answer» E. | |
| 224. |
The most significant difference in two X ray beams produced at different kV settingsis: |
| A. | Beam intensity |
| B. | Exposure |
| C. | Wavelength distribution |
| D. | Beam divergence |
| Answer» D. Beam divergence | |
| 225. |
The ASTM penetrameter for a 25 mm thick test piece contains holes of what sizes? |
| A. | T, 2T, 3T |
| B. | 2T, 3T, 4T |
| C. | T, 2T, 4T |
| D. | T, 3T, 4T |
| Answer» D. T, 3T, 4T | |
| 226. |
Possible degradation of penetrant materials performance is often checked by: |
| A. | Performing penetrant testing of comparator blocks using samples of new and used penetrant materials |
| B. | Water tolerance test |
| C. | Using a penetrant test penetrameter |
| D. | Judgment of a qualified inspector during production testing |
| Answer» B. Water tolerance test | |
| 227. |
An ultrasonic test using a straight beam contact search unit is being conductedthrough the thickness of a flat part such as a plate. This test should detect: |
| A. | Laminar-type flaws with major dimensions parallel to the rolled surface |
| B. | Transverse-type flaws with major dimensions at right angles to the rolled surface |
| C. | Radial flaws with major dimensions along length but radially oriented to the rolled surface |
| D. | None of the above |
| Answer» B. Transverse-type flaws with major dimensions at right angles to the rolled surface | |
| 228. |
Gamma ray or high voltage X ray radiography, using film without lead screens, is likelyto result in: |
| A. | Mottling of the film |
| B. | Increased geometric unsharpness |
| C. | No apparent difference, but increased exposure time |
| D. | No apparent difference, but decreased exposure time |
| Answer» B. Increased geometric unsharpness | |
| 229. |
If it were necessary to radiograph 18 cm (7 in.) thick steel product, which of thefollowing gamma ray sources would most be used? |
| A. | Cs–137 |
| B. | Tm–170 |
| C. | Ir–192 |
| D. | Co–60 |
| Answer» E. | |
| 230. |
According to ASTM E709-95 in using prod technique on a 50 mm thickness plate witha prod spacing of 101 mm (4 inches), current shall be selected in the following range: |
| A. | 300-450A |
| B. | 400-500 A |
| C. | 500-625A |
| D. | 550-700 A |
| Answer» B. 400-500 A | |
| 231. |
The flux density of the magnetism induced by a coil is affected by: |
| A. | The coil size |
| B. | The current in the coil |
| C. | The number of turns in the coil |
| D. | All of the above |
| Answer» E. | |
| 232. |
For gamma ray sources, radiographic intensity is proportional to source activity ingigabecquerels or curies for: |
| A. | All sources |
| B. | Large sources |
| C. | Small sources |
| D. | None of the above |
| Answer» B. Large sources | |
| 233. |
Paint will not affect the detection of a crack if: |
| A. | The paint is thick and the defect is subsurface |
| B. | The paint is thin and the crack is parallel to the direction of flux lines |
| C. | The crack is sharp and the paint is thin |
| D. | All of the above |
| Answer» D. All of the above | |
| 234. |
Visible, solvent removable penetrants are most advantageous for: |
| A. | Inspecting parts with rough surfaces |
| B. | Inspecting batches of small parts |
| C. | Inspecting parts at remote locations |
| D. | Inspecting parts with porous surfaces |
| Answer» D. Inspecting parts with porous surfaces | |
| 235. |
An indication is a defect under which of the following conditions? |
| A. | If it is greater than 3.8 cm (1.5 inches) long |
| B. | If it exceeds the limits of a standard or specification |
| C. | If it is deep |
| D. | Under all of the above indications |
| Answer» C. If it is deep | |
| 236. |
Open, shallow discontinuities are best detected by which penetrant testing method? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | None of the above |
| Answer» D. None of the above | |
| 237. |
When adding water to a penetrant, the water tolerance limit is indicated when: |
| A. | Opacity reaches 2% of International optical transmission standard |
| B. | The penetrant material and dye separate into their constituent parts |
| C. | Permanent cloudiness occurs |
| D. | None of the above |
| Answer» D. None of the above | |
| 238. |
Which of the following types of radiation is commonly used in radiographic testing?(Choose one): |
| A. | Alpha particles |
| B. | Neutrons |
| C. | gamma rays |
| D. | Beta rays |
| Answer» D. Beta rays | |
| 239. |
Another name for a compression wave is a: |
| A. | Lamb wave |
| B. | Shear wave |
| C. | Longitudinal wave |
| D. | Transverse wave |
| Answer» D. Transverse wave | |
| 240. |
The most effective liquid ultrasonic couplant (highest acoustic impedance) is: |
| A. | SAE 30 motor oil |
| B. | Glycerine |
| C. | Water |
| D. | Grease |
| Answer» C. Water | |
| 241. |
Calculate geometric unsharpness for the following conditions: Source size = 2 mm × 2mm; SFD = 700 mm; test piece thickness = 25 mm |
| A. | 0.6 mm |
| B. | 0.06 mm |
| C. | 6,0 mm |
| D. | 0.15 mm |
| Answer» E. | |
| 242. |
The echo on the cathode ray tube (CRT) which represents the far boundary of thematerial being tested is called: |
| A. | Hash |
| B. | The initial pulse |
| C. | The ‘main bang’ |
| D. | The back wall echo |
| Answer» E. | |
| 243. |
The 100 mm radius in an IIW block is used to: |
| A. | Calibrate sensitivity level |
| B. | Check resolution |
| C. | Calibrate angle beam distance |
| D. | Check beam angle |
| Answer» D. Check beam angle | |
| 244. |
A technique used to find transverse discontinuities at the ends of longitudinallymagnetised bars by the use of transient currents is called: |
| A. | A coil technique |
| B. | A fast break technique |
| C. | A yoke technique |
| D. | A head shot |
| Answer» C. A yoke technique | |
| 245. |
When comparing discontinuity echoes to equivalent flat bottom hole echoes inmaterials with similar impedance, surface finish and attenuation: |
| A. | The flaw is never larger than the flat bottom hole |
| B. | The flaw is never smaller than the flat bottom hole |
| C. | The flaw is always smaller than the flat bottom hole |
| D. | None of the above |
| Answer» E. | |
| 246. |
What is the primary difference between X rays and gamma rays of the same energy? |
| A. | Wavelength |
| B. | Frequency |
| C. | Velocity |
| D. | Origin |
| Answer» E. | |
| 247. |
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» E. | |
| 248. |
Of the piezoelectric materials listed below, the most efficient sound transmitter is: |
| A. | Lithium sulphate |
| B. | Quartz |
| C. | Barium titanate |
| D. | Silver oxide |
| Answer» D. Silver oxide | |
| 249. |
What is the magnetic field strength at the surface of a 100 mm diameter bar as comparedto that at the surface of a 50 mm diameter bar, each carrying 1000 amps of current? |
| A. | Twice |
| B. | One half |
| C. | One quarter |
| D. | Four times |
| Answer» C. One quarter | |
| 250. |
Which type of film would exhibit the coarsest grain? |
| A. | Slow |
| B. | Medium |
| C. | Fast |
| D. | No difference in the grain sizes |
| Answer» D. No difference in the grain sizes | |