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

d. do not need an emulsifier

143. Liquid penetrant inspection can detect

a. internal porosity in a casting

b. fatigue cracks in aluminum alloy parts

c. carbon content of steel

d. uncontaminated open-to-surface discontinuities

144. The basic principle of all liquid penetrant tests is

a. rule of fight hand thumb b. capillary action

c. snell's law d. osmosis

145. Non-fluorescent non-water washable penetrants have one of the following as an advantage over other

penetrants

a. they produce yellow-green images under black light

b. they can be used at very low temperatures

c. they blot penetrants from discontinuities

d. they are highly portable

146. Which of the following is the one true limitation of liquid penetrant inspection?

a. it cannot be used on ferro-magnetic materials

b. it cannot locate sub-surface discontinuities

c. it cannot be used on non- metallic surfaces

d. it cannot detect fine surface porosity

147. The back and forth movement of particles within a medium are called

a. cycles b. vibrations

c. displacements d. wavelengths

148. Ultrasonic vibrations are generally defined as having a frequency above

a. 5,000 cps b. 20,000 cps c. 10,000 cps d. 50,000 cps

149. Transducers used in ultrasonic testing exhibit which of the following effects

a. ferromagnetic b. hyperacoustic

c. electromechinical d. piezoelectric

150. The zone in an ultrasonic beam where irregular intensities exist is called the

a. near zone b. for zone c. irrgular zone d. dead zone

151. As the frequency increases beam spread (divergence) for a given diameter transducer

a. decreases b. remains the same c. increases d. varies uniformly

152. Longitudinal (compressional) waves produce vibrations which are

a. in the same direction as the propagation of the sound

b. perpendicular to the motion of the sound

c. elliptical

153. The angle of reflection of an ultrasonic beam is

a. equal to the angle of refraction

b. approximately four times the angle of incidence

c. approximately half the angle of incidence

d. equal to the angle of incidence

154. Almost all gamma radiography is done with artifical

a. particles b. isotopes c. radium d. x-ray machines

155. Which of the following are commonly used isotopes for radiographic purposes?

a. osmium 188 b. radium c. iridium 192 d. cobalt 60

156. The curie is a measure of the number of per second of a radioactive source

a. gamma rays b. alpha particles c. disintegrations d. bombardments

157. The amount of X or gamma radiation is fgten spoken of as the of the radiation

a. wave length b. frequency c. energy d. intensity

158. The primary difference between x-rays and gamma rays of the same energy is

a. origin b. velocity c. wavelength d. frequency

159. The basic unit of measure used to express gamma of X-radiation exposure is the

a. rem b. rentgen c. rad d. RBE

160. To increase the penetration power of an x-ray to the tube should be

a. amperage b. increased c. voltage d. decreased

 

 

 

ANSWER

141	142	143	144	145	146	147	148	149	150
B	D	D	B	B	B	B	B	D	A
151	152	153	154	155	156	157	158	159	160
A	A	D	B	D	C	D	A	B	B