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. pressure change technique

d. mass flow technique

382. the gradient of a specific radiographic film characteristic curve relating film density to the logarithm of X-ray

exposure varies primarily only with the

a. developed film density resulting from exposure and precessing

b. energy of X-radiation used during exposure

c. degree of focing of the developed film prior to washing and drying

d. gradient for any specific X-ray film is constant and does not vary with either exposure to result film

383. when evaluating porosity with a tail

a. accept it regardless of size unless it contains a crack

b. include the tail as part of the dimensioning

c. only evaluate linear indications

d. do not include tail as part of dimensioning

384. the incorporation of a focusing cup in the construction of an X-ray tube wall

a. increase the efficeency of the tube by providing improved cooling characteristics

b. significantly increase the kV capability of the X-ray tube

c. significantly increase the mA capability of the X-ray tube

d. increase the density of the electrons from the cathode

385. since damage in specimens do not provide the necessary X-ray contrast an X-ray cpaque flaid

should be applied to the surface of the specimen in the damaged region

a. cast iron

b. solid propellants

c. composite

d. welds

386. a film artifact caused by bending the film abruptly and is lighter in density in the area of bending is call a

a. screen marks

b. chemical streaking

c. crimp marks after exposure

d. crimp marks before exposure

387. the ratio of the total X- radiation power produced to the total power of the impinging electron beam on the

target is referred to as the

a. target potential

b. target size determinator

c. target efficiency

d. focal spot selector

388. when using an on-stream projection technique used to determine the wall thickness of a pipe a long

exposure time is required because of the over irradiation at the edge of the pipe

a. the wall thickness shows up thinner

b. the wall thickness shows up thicker

c. the wall shows up like pitting corrosion on the inside of the pipe

d. the wall shows up like pitting on the outside of the pipe

389. in practical radiography with only one exception all exposing radiation is polychromatic which source of

radiation used for radiography is not polychromatic?

a. super voltage X-ray

b. thulium 170

c. cesium 137

d. grenz rays

390. which gas is commonly used in the chamber of a goseous ionization detector?

a. carbon dioxide

b. nitrogen

c. oxygen

d. carbon monoxide

391. a metallic filter placed between the source and the object is used to

a. reduce short wave length radiation

b. reduce long wave length radiation

c. increase subject contrast

d. normalize radiation

392. an unacceptable flaw has been ideutified in a 3/4 inch thick plate concerning stereoradiography which of

the following is true?

a. a single radiography is exposed using two radiation sources positioned parallel to the film

b. the relationship between flaw height is exponential to image shift

c. the movement of the source between the two required exposures is equal to the pupllary distance of

human eyes

d. the sources are positioned on the opposite side of the plate(180 degrees apart)

393. relatively small physical size is indicative of a radioisotope sealed source of

a. low energy level

b. high specific activity

c. high self absorption

d. long half life

394. it is acceptable practice to view radiographs

a. in a room with sufficient lighting to compensate for the bright glare coming from the illuminator

b. in a room with sufficient lighting so that the reflection density can be defined as the logarithm of the incident

light intensity to the reflected light intensity

c. in subdued lighting free from reflections that may hinder film interpretation

d. in an area that is tolally dark

395. dark patches on a film can be caused by

a. excessive rinsing before development

b. scratched emulsion after exposure

c. drop of fixer falling onto the film before development

d. drops of developer falling on to the film before development

396. photons of penetrating radiation with longer wavelengths

a. have more energy than short wavelength photons

b. travel further though matter then short wavelength photons

c. have higher velocities than short wavelength photons

d. have lower energies and less penetrating power than short wavelength photons

397. a difference between a radiograph and a real time radiographic image is

a. the real time image has greater resolution

b. the radiograph will have a lower sensitivity

c. real time radiography requires the use of special isotopes

d. each image is a reverse of the other

398. in a radiograph of a butt weld in a steel plate what do less dense indications located randomly throughout

the weld area indicate

a. inclusions of radiographically dense material

b. scattered gas porosity

c. weld spatter on the plate surface

d. undercutting

399. the seleotron of an NDT method for a given product should be made primarily on the basis of the

a. avanlability of qualified NDT personnel

b. characteristics of the product and its intended use

c. avanlability of calibrated NDT equipment

d. the employer's recommended practice

400. in accordance with CP-189 technique who attend a NDT training course will receive credit for the training

if they

a. sign an attendance sheet

b. receive a certificate oigned by the instructor

c. pass a final exam

d. record dates rines course outline and instructor

 

 

 

 

 

 

 

 

 

 

ANSWER

381	382	383	384	385	386	387	388	389	390
B	B	B	D	C	D	C	A	C	B
391	392	393	394	395	396	397	398	399	400
B	A	B	C	D	D	D	C	B	C