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전체 글419

QUIZ) ASNT L3 BASIC 22 421. an NDT personnel qualification and certification written practice in accordance with SNT-TC-1A, must describe the a. background and title of the designated certifying agent of the employer b. procedures that are used in evaluating materials and component in accordance with specific code standard and specification c. responsibility of each level of certification for determining the acceptabi.. 2020. 7. 9.
QUIZ) ASNT L3 BASIC 21 401. electrical discharge machining is useful in nondestructive testing because it can prodece a. fine surface finishes b. small hole’s and notches c. sharp reductions in cross section area d. natural flows for precision calibration blocks 402. an industrial fiber-optic borescope will have which of the following component? a. rigid tubes joining the lenses in the system b. copper wires to transm.. 2020. 7. 9.
QUIZ) ASNT L3 BASIC 20 381. the welds of a very large comples container must be leak tested both sides of the welded joint are accessible the container will operate at pressures as high as 15 psig and must not leak which leak testing technique would be the most economical test that is sufficiently sensitive to assure the container will not leak? a. through wall penetrant technique b. bubble vacuum box technique c. pre.. 2020. 7. 9.
QUIZ) ASNT L3 BASIC 19 361. an inherent defect that are thin flat discontinuity found in plate or strip and are a result of gas inclusion or pipe in the original ingot is a. inclusion b. pipes c. dross d. lamination 362. the highest sensitivity of a hail generator is obtained when the direction of the magnetic field in relation to the largest surface of the hall probe is a. parallel b. at an angle of 45 degrees c. at .. 2020. 7. 9.
QUIZ) ASNT L3 BASIC 18 341. Eddy current testing of a material cannot a. measure to conductivity b. detect small near-surface discontinuities c. measure its ductility d. measure its magnetic permeability 342. which of the following properties of Al alloys is most affected by the presence of geometric stress riser? a. ductility b. corrosion resistance c. conductivity d. endurance limits 343. which of the following weld.. 2020. 7. 9.
QUIZ) ASNT L3 BASIC 17 321. in a direct current magnetic particle test of a 1" thick carbon steel weld using prods 5" part what minimum current will be needed? a. 50 ampere b. 150 ampere c. 350 ampere d. 500 ampere 322. the general method of producing X-rays involves the sudden deceleration of high velocity electrons in a solid body called a a. focus cup b. target c. filament d. cathode 323. the penetrating ability of.. 2020. 7. 9.
QUIZ) ASNT L3 BASIC 16 301. monel and inconel are a. magnesium alloys b. nickel alloys c. beryllium d. tungsten alloys 302. the acronym EDM refers to a. electrolytic dipolar machining b. energy diatomic mixture c. electrolytic discharge machining d. electrochemical machining 303. which of the following is the term "anodizing" associated a. surface treatment of stainless steel alloys b. metal surface cleaning c. surfac.. 2020. 7. 9.
QUIZ) ASNT L3 BASIC 15 281. eddy current testing of a material consert? a. measure its conductivity b. detect small, near surface discontinuity c. measure its ductility d. measure its magnetic permeability 282. in angle beam ultrasonic testing of plate the defect most probably undetectable would be a. cracks which are perpendicular to the sound-wave b. inclusions which are randomly oriented c. cracks which are paralle.. 2020. 7. 9.
QUIZ) ASNT L3 BASIC 14 261. 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 increasing distance from the poles of a permanent magnet c. they are considered to have direction d. they seek paths of least magnets resistance of least reluctance 262. surrounding an electromagnet the magnets field is strongest a. immediately afte.. 2020. 7. 9.
QUIZ) ASNT L3 BASIC 13 241. Which of the following is an advantage of fluorescent penetrants over visible dye penetrants? a. the inspection can be carryed out in a well-lighted area b. small indications are more easily seen c. can be used where contact with water is objectionable d. less sensitive to contamination of discontinuities 242. Reference standards used for eddy current testing a. must contain artificial disc.. 2020. 7. 9.
QUIZ) ASNT L3 BASIC 12 221. The method that can’t thest brazed joint? a. RT b. UT c. ECT or MT d. LT 222. The method to measure young modules? a. UT b. ECT c. MT d. RT 223. Fracture mechanics analysis is an established engineering analysis process which assumes that a. all components an flaw free at the time of manufacture b. all components an time flaw as a requirements for determining warranty c. the number of flaws.. 2020. 7. 9.
QUIZ) ASNT L3 BASIC 11 201. Green sand casting molds include a. sand clay and water b. sand wax and solvent c. sand refractory metals and water d. sand carbon green clay 202. Small metal supports used to support and position cores become part of a casting by fusing with the molten metal. Such devices are called a. core hangers b. chills c. chaplets d. risers 203. for checking the wear or clearance of ball in steel val.. 2020. 7. 9.
QUIZ) ASNT L3 BASIC 10 181. lamella tearing in a steel weldment a. can only occur if laminations are present b. can only occur in the presence of hydrogen and martensite formation in the beat affected zone c. are cracks in the base metal due to high tensile stresses in the through-thickness direction of the plate d. occur as crater cracks in the weld bead 182. If there is insufficient weld metal to fill the weld joint.. 2020. 7. 9.
QUIZ) ASNT L3 BASIC 9 161. When this flow of eddy currents very within a material the indication across the test coil will a. remain unchanged b. change as the flow of eddy currents change c. completely disappear 162. The test coil ’s magnetic field will a. not pass through carbon steels b. not pass through nonconductive coatings c. pass through nonconductive coatings 163. Certifications in accordance with SNT-TC-1A .. 2020. 7. 9.
QUIZ) ASNT L3 BASIC 8 141. An excessively long emulsification time might result in a. false indications b. shallow discontinuity indications being lost c. excessive background fluorscence d. loss of indication of tight cracks 142. Water washable liquid penetrants differ from post-emulsifiable liquid penetrants in that they a. can only be used on non-ferrous parts b. have an oily base c. must be removed with a solvent.. 2020. 7. 9.
QUIZ) ASNT L3 BASIC 7 121. to determine amperage for longitudinal magnetization of a steel bar divide the constant value(45,000) by the a. L/D ratio of the bar b. L/D ratio lines the number of coil turns 122. The strength of the magnetic leakage field from a discontinuity is affected by the a. length of the discontinulty b. size of the contact area c. amperage used during magnetization d. depth of the discontinuity 1.. 2020. 7. 9.
QUIZ) ASNT L3 BASIC 5 81. The line of force that form a path around a crack in a ring magnet are called a. magnetic lines b. leakage flux c. field strength d. longitudinal field 82. A magnetic discontinuity which is break in the magnetic uniformity of a part is related to a sudden change in a. inductance b. resistivity c. capacitance d. permeability 83. The most effective MT method for inspection of a large casting i.. 2020. 7. 8.
QUIZ) ASNT L3 BASIC 4 61. with which of the following is the term "rockwell" associates? a. index of metal machinability b. tensile testing c. strain gauges d. indentation hardness testing 62. metal fatigue is most likely to be found in structures a. loaded under constant high stress b. having undergone a substantial overload c. subject to cyclic vibratory or stress reversal loads d. loaded in constant tension 63. In.. 2020. 7. 8.
QUIZ) ASNT L3 BASIC 3 41. The velocity of sound in steel a. is greater frequency increase b. is lower than the velocity of sound in water c. changes if mode conversion occurs d. is dependent of the reflection factor 42. In an acoustic emission test, the sensor has a resonant frequency of 150 KHz and the speed of sound is measured as 3000m/s. The wavelength at the sensor frequency is a. 0.05mm b. 20mm c. 20M d. 450M 4.. 2020. 7. 8.
BASIC differences between SNT-TC-1A, CP-189 (비교)6 2020. 7. 8.
QUIZ) ASNT L3 MT 4 61. Which of the following would be most applicable for the detection of sub-surface flaws in a high permeability welded structure? A. Wet fluorescent-AC B. Dry visible-FWDC C. Dry visible-HWDC D. Wet fluorescent-DC 62. Which of the statements below are not typically employed to prevent or minimize prod marks on parts A. Use padded prods B. Reduce prod spacing and magnetizing current C. Make sur.. 2020. 6. 26.
QUIZ) ASNT L3 MT 3 41. The bulk indicator is designed and normally used for an assessment of magnetic leakage fields as a practical check on the external demagnetization state of an object. The indicators commonly used for checking external field levels after a magnetic particle test normally have a range of about 1 to 2mT (10 to 20 Gauss). Positive and negative readings represent which pole? A. Positive readings .. 2020. 6. 26.
QUIZ) ASNT L3 MT 2 21. When establishing a magnetic particle procedure for a part to be used in a specific application, there are many parameters that should be included in the procedure. Of the items listed below, which one has no appreciable effect on the inspection results? A. Type of magnetic particles B. Type and amount of applied current C. Direction of magnetizing field D. Reference to applicable standards .. 2020. 6. 26.
QUIZ) ASNT L3 UT 13 241. Rough surfaces cause the echo amplitude from discontinuities with in the part to a. increase b. decrease c. not change d. change frequency 242. When a sound beam travels from a liquid Into a metal through a contoured surface the sound team inside the metal will a. have the phase velocities of the first symmetrical and asymmetrical modes b. have the Phase velocity of the incident longitudina.. 2020. 6. 24.
QUIZ) ASNT L3 UT 12 221. The sensitivity of an ultrasonic test system a. depends on the search unit, pulser, and amplifier used b. decreases as the frequency is increased c. increases as the resolution increases d. Is not related to mechanical damping or the transducer 222. The ability of a test system to separate the front-surface echo and the echo from a small discontinuity just below the surface a. depends prima.. 2020. 6. 24.
QUIZ) ASNT L3 UT 11 201. A point, line or surface of a vibrating body marked by absolute or relative freedom from vibratory motion is referred to as A. a node B. a finger C. length D. depth 202. ultrasonic testing of castings usually requires A. high frequency transducers B. lower frequency transducers C. delay tip transducers D. transducer bubbler system 203. A notch type reference standard for tubing should be ma.. 2020. 6. 24.
QUIZ) ASNT L3 UT 10 181. For a longitudinal immersion test, an automatic scanner is set to scan at 50cm/sec with a pulse repetition rate of 500 pulses per second and the water path is 25cm over an aluminum plate. Assuming an effective beam diameter of 0.220cm at the depth of the flaw, on the average how many effective interrogation would be made during one scan over a flaw equivalent to a flat-bottomed hole 0.0397c.. 2020. 6. 24.
QUIZ) ASNT L3 UT 9 160. testing is usually accomplished by A. a crystal generating a face-shear type of energy B. angulation of the transducer above the first critical angle, but below second critical angle C. a transverse length expansion crystal D. a crystal with a thickness shear type of ~~~ 161. In the phased array technique, the effect produced when one transducer pulses: then after a brief delay a second tra.. 2020. 6. 24.
QUIZ) ASNT L3 UT 8 141. velocity is A. a vector of phase propagation B. a vector representing angular phase preparation C. speed of propagation D. varying with grain size 142. Counter bores close to the weld can produce signals that may be interpreted as A. Back wall reflection of the base metal surface B. lamination in the base metal C. lack of fusion / penetration D. weld face reinforcement 143. When calibration.. 2020. 6. 24.
QUIZ) ASNT L3 UT 7 121. An application appropriate for wall thichness measurement near surface A. focused angle probe B. standard single crystal probe C. TR probes D. high frequency vertical probe 122. Inspection of oil rings is prescribed in codes written by A. AWS B. ASTM C. ASME D. Nuclear Regulatory Committee 123. A circular disk flay much smaller than the wave length A. is likely to miss detection B. will ref.. 2020. 6. 24.
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