MCQOPTIONS
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MCQOPTIONS
This section includes 335 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
Which penetrant process is best suited to the detection of discontinuities in a test piece having threads and keyways? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» C. Post emulsifiable | |
| 302. |
Source-to-object distance, object-to-film distance, and source size are the three factors that control the of the radiograph. |
| A. | Density |
| B. | Exposure |
| C. | Film size |
| D. | Unsharpness |
| Answer» E. | |
| 303. |
A dark crescent shaped spot, clearly in the base metal adjacent to a weld would probably be: |
| A. | Burn through |
| B. | Film crimp mark |
| C. | A crack |
| D. | A water spot on the film |
| Answer» C. A crack | |
| 304. |
The range of the specimen thickness that can be adequately recorded on a radiograph is known as the of the radiograph. |
| A. | Sensitivity |
| B. | Latitude |
| C. | Accuracy |
| D. | Intensity |
| Answer» C. Accuracy | |
| 305. |
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» E. | |
| 306. |
Why is it important to view the test piece shortly after developer application and periodically through the development time? |
| A. | To make sure the developer dries evenly |
| B. | To guard against pooling of developer in low areas |
| C. | To avoid missing small flaw indications adjacent to areas of high bleed-out |
| D. | To avoid missing transient indications against an otherwise clean background |
| Answer» D. To avoid missing transient indications against an otherwise clean background | |
| 307. |
While performing a fluorescent water washable penetrant test, which of the following steps should be performed under black light? |
| A. | Penetrant application |
| B. | Excess penetrant removal |
| C. | Emulsification |
| D. | Developer application |
| Answer» C. Emulsification | |
| 308. |
Which of the following is not (!) an advantage of a water washable fluorescent penetrant process? |
| A. | Excess penetrant is easily removed with a water wash |
| B. | It is well suited to testing large quantities of small parts |
| C. | It is readily removed from shallow discontinuities |
| D. | It has low cost, low processing time compared to the post emulsified penetrant process |
| Answer» D. It has low cost, low processing time compared to the post emulsified penetrant process | |
| 309. |
The multi-film technique may be used when one radiograph film does not have enough to produce a satisfactory radiograph of a specimen. |
| A. | Latitude |
| B. | Definition |
| C. | Graininess |
| D. | Activity |
| Answer» B. Definition | |
| 310. |
What is the preferred method of removing paint prior to performing a penetrant testing? |
| A. | Sand blast |
| B. | Chemical removers |
| C. | Power wire brush |
| D. | Shot blast |
| Answer» C. Power wire brush | |
| 311. |
The fluorescent dyes used in the liquid penetrant testing process are most active when energised with black light of what wavelengths? ( stands for angstrom units) |
| A. | 2.0 10-7m (2000 ) |
| B. | 2.5 10-7m (2500 ) |
| C. | 3.25 10-7m (3250 ) |
| D. | 3.65 10-7m (3650 ) |
| Answer» E. | |
| 312. |
A dark, sharply defined, straight line in the centre of the weld, and running parallel with the length of the weld should be interpreted as: |
| A. | Porosity |
| B. | Incomplete penetration |
| C. | A slag inclusion |
| D. | Lack of fusion |
| Answer» C. A slag inclusion | |
| 313. |
A dark circle type indication appearing on a radiograph that is the result of the failure of a core support to completely melt is called: |
| A. | A hot tear |
| B. | A gas hole |
| C. | An unfused chaplet |
| D. | A spongy shrink |
| Answer» D. A spongy shrink | |
| 314. |
The following precautions must be observed when removing the excess surface penetrant with a water wash method using a hose pipe: |
| A. | The wash angle should be at 45o |
| B. | A coarse droplet spray |
| C. | Temperature of water 16 to 43oC |
| D. | Pressure as low as possible not to exceed 50 psi |
| Answer» C. Temperature of water 16 to 43oC | |
| 315. |
In performing a water content test of a lipophilic emulsifier per ASTM D-95, what solvent is used? |
| A. | Naptha |
| B. | Trichloroethane |
| C. | Benzene |
| D. | Xylene |
| Answer» E. | |
| 316. |
Halogen content of penetrant materials is limited because of the possibility of stress corrosion cracking in which of the following materials? |
| A. | High tensile steel |
| B. | Austenitic stainless steel |
| C. | Titanium alloys |
| D. | All of the above |
| Answer» E. | |
| 317. |
When performing a fluorescent penetrant examination, excess penetrant is normally removed: |
| A. | By a hydrophilic scrubber |
| B. | Under UV light |
| C. | By solvent spray |
| D. | By vapour degreasing |
| Answer» C. By solvent spray | |
| 318. |
Which of the following developers requires the test piece to be dried prior to its application? |
| A. | Water washable |
| B. | Water suspendable |
| C. | Non-aqueous suspendable |
| D. | All of the above |
| Answer» D. All of the above | |
| 319. |
Which of the following types of pre-cleaning processes may be used for liquid penetrant testing? |
| A. | Wire brushing only |
| B. | Detergent and water only |
| C. | Vapour degreasing only |
| D. | Any process that leaves the part clean and dry, does not harm the part and is |
| Answer» E. | |
| 320. |
What is the minimum time considered necessary for dark adaptation of the eyes prior to evaluating the results of a fluorescent penetrant test? |
| A. | 1 minute |
| B. | 2 minutes |
| C. | 5 minutes |
| D. | 10 minutes |
| Answer» D. 10 minutes | |
| 321. |
Dark rounded indications with rather smooth edges appear on the radiograph of casting made in sand mould. These indications would be interpreted as: |
| A. | Slag inclusions |
| B. | Misrun |
| C. | Shrinkage |
| D. | Gas holes |
| Answer» E. | |
| 322. |
Which type of developer does not (!) provide a contrasting background against which to view penetrant indications? |
| A. | Dry |
| B. | Non-aqueous wet |
| C. | Water soluble |
| D. | Water suspendable |
| Answer» B. Non-aqueous wet | |
| 323. |
Which of the following is normally prohibited as a method of removing excess penetrant when using the solvent removable penetrant process? |
| A. | A water spray |
| B. | A hydrophilic scrubber |
| C. | A solvent spray |
| D. | Clean with lint free towels moistened with solvent |
| Answer» D. Clean with lint free towels moistened with solvent | |
| 324. |
Which of the following metals must be tested with low halogen sulphur free penetrant materials: |
| A. | Copper, silver, gold |
| B. | Nickel based alloys, certain stainless steel materials |
| C. | Steel, iron, aluminium |
| D. | Plastic, wood, paper |
| Answer» E. | |
| 325. |
How will the excess surface penetrant be removed if a post emulsified penetrant was used: |
| 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 | |
| 326. |
What is the proper technique for removal of excess penetrant from a part when using a water washable penetrant process? |
| A. | Fine spray normal to the surface |
| B. | Coarse spray normal to the surface |
| C. | Fine spray at 45 degrees to the surface |
| D. | Coarse spray at 45 degrees to the surface |
| Answer» E. | |
| 327. |
During a visible, solvent removable penetrant test, complete penetrant removal is indicated by: |
| A. | Absence of red indications on the test piece surface |
| B. | Clean rinse water |
| C. | Completion of the rinse cycle |
| D. | Absence of red dye on the cleaning towels |
| Answer» E. | |
| 328. |
Which of the following methods is not recommended for pre-cleaning prior to a liquid penetrant test: |
| A. | Steam cleaning, etching, rust and paint removal |
| B. | Solvent wipe, vapour degreasing, ultrasonic bath cleaning |
| C. | Blasting, grinding, filing, honing, machining |
| D. | All of the listed methods are not recommended |
| Answer» E. | |
| 329. |
Excess penetrant removal is a two step process with which of the following penetrant methods? |
| A. | Water washable |
| B. | Post emulsifiable |
| C. | Solvent removable |
| D. | Liquid oxygen applications |
| Answer» C. Solvent removable | |
| 330. |
Surface breaking porosity will show what type of relevant indications when a welded aluminium plate is tested with the liquid penetrant method: |
| A. | Linear indications |
| B. | Square indications |
| C. | Triangular indications |
| D. | Rounded indications |
| Answer» C. Triangular indications | |
| 331. |
What is the likely result of incomplete removal of all excess penetrant from the test piece surface? |
| A. | Formation of false indications |
| B. | Formation of relevant indications |
| C. | Exaggeration of the size of relevant indications |
| D. | None of the above |
| Answer» B. Formation of relevant indications | |
| 332. |
The reverse magnetising force necessary to remove a residual magnetic field from a test piece after it has been magnetically saturated is called: |
| A. | Hysteresis |
| B. | Coercive force |
| C. | Demagnetising flux |
| D. | Reverse saturation |
| Answer» C. Demagnetising flux | |
| 333. |
Cracks, lack of penetration, lack of fusion which are surface breaking on a welded aluminium plate which has been liquid penetrant tested will show as: |
| A. | Linear indications |
| B. | Rounded indications |
| C. | Square indications |
| D. | Triangular indications |
| Answer» D. Triangular indications | |
| 334. |
The time period during which penetrant remains on the surface of the test piece is called: |
| A. | Dwell time |
| B. | Soaking time |
| C. | Fixing time |
| D. | Development time |
| Answer» B. Soaking time | |
| 335. |
Re-cycling of penetrant and rinse water is facilitated with which of the following emulsifier types? |
| A. | Hydrophobic |
| B. | Hydrophilic |
| C. | Lipophilic |
| D. | Hygroscopic |
| Answer» C. Lipophilic | |