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 a UT instrument for shear wave which calibration standard is the most sensitive

when adjusting for sensitivity

A. IIW B. DSC C. FBH standard D. AWS block

144. A device using a liquid stream to couple on ultrasonic beam to the test piece is called

A. collimator

B. bubbler

C. schlieren system

D. wedge

145. When unitzing ultrasonic to determine bond integrity the equipment selected must be capable of

electronically comparing the signal ( ) to a previously established level

A. amplitude

B. phase

C. amplitude and phase

D. bandwidth

146. The most importance factor that differentiates immersion testing from contact testing is

A. Through transmission is easier to be implemented in immersion testing than contact testing

B. immersion testing was invented later than contact testing

C. the length or depth of the couplant medium is usually much larger in immersion testing than in

contact testing

D. immersion testing is used more frequently in aerospace industry than other industries

147. Pulse echo immersion test system can be use which of the following parameters to detect and

characterize discontinuities?

A. Front surface reflection amplitude variations

B. Reflection signal compensation approach method

C. Signal processing using echo dynamic response

D. Back surface reflection distance

148. The top of an ingot is cut off primarily to eliminate

A. porosity B. gate cracks C. pipe D. laminations

149. Which of the following factor cause the variations in acoustic pressure which occur within the Fresnel Zone?

A. Harmonic resonance of the transducer

B. Interfere pattern between different oscillations within the wave trains

C. Beam spread in the Fraunhofer zone

D. Sound traveling from multiple points between material grains

150. Change on which poperty of a sound beam allows the measurement of pressure and temperature of fluids

A. scattering or sound beam in the material

B. velocity of sound beam in the material

C. attenuation of sound beam in the material

D. diffraction of sound beam in the material

151. Specially designed remote pulsar preamplifier modules are use to counter the affect of

A. Long cable

B. Custom transducer for composites

C. Large grain boundaries

D. High temperature meterial

152. The characteristic that determines the amount of sound wave reflection at the boundary of two

materials with different velocities

A. frequency ratio

B. acoustic impedance ratio

C. beam intensity ratio

D. velocities ratio differential

153. For immersion ultrasonic testing precision steel balts are used as target reflection for measuring

certain inspection system characteristic. Which of the characteristic below can be measured by

using precision steel balts?

A. Vertical linearity and limit

B. Transducer beam symmetry

C. Horizontal linearity

D. Inspection system attenuation checks

154. unacceptable transducer performance can usually be detected

A. by frequency calibrations checks

B. during scanning by the inspector watching the transducer

C. during post scan clean up

D. by obtaining beam spread profile comparisons on a calibration standard

155. The most desirable characteristic of ultrasonic testing is

A. it's ability to detect all defects regardless of orientation

B. that is inexpensive and extremely fast method to apply

C. it’s accuracy In ~~~~~~~~

D. ~~~~~~~~~

156. A plane concave lens with a radius of curvature of one inch is used in an immersion examination.

If the water and the test material yield an index of refraction of 1.75 what would be the focal length in water?

A. 0.43 inches B. 2 inches C. 2.33 inches D. 3.2 inches

157. For a longitudinal immersion test an automatic scanner is set to scan st 50cm/s with a pulse repetition

rate of 500 pulses per second and the water path is 25cm over an aluminum plate. A flaw is located

1 cm below the surface of the plate. How for will the transducer travel in it's scan path during the time

for a pulse to make a round tip between the transducer and flaw?

A. 0.20 mm B. 0.17 mm C. 0.27 mm D. 1.70 mm

158. Why is it difficult to evaluate disbond conditions in multi-Iayered structures and composites viewing

only the reflected interface signal?

A. The amplitude of the back wall signal will mask the interface signal

B. Bond thickness may be so thin as to make interface front / back surface reflections indistinguishable

C. The amplitude of the front wall signal may mask the interface signal

D. multiple reflections from the layer interface may not be distinguishable

159. When electronic distance amplitude correction is used in an ultrasonic system vertical amplitudes

displayed output is

A. purposefully made to be equal to the uncorrected display

B. purposefully made to be unchanged

C. purposefully made to be nonlinear

D. purposefully made to the linear

 

 

answer

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