ARDMS SPI PRACTICE TEST NEW ALL DONE SOLUTION

ARDMS SPI PRACTICE TEST NEW ALL DONE SOLUTION Which of the following do the source and the medium determine? a. duty factor b. frequency c. propagation speed d. axial resolution Axial resolution is affected by all of the following EXCEPT a. frequency b. damping c. spatial pulse length d. focusing Damping in a transducer a. reduces the number of cycles in a pulse and increases the quality factor b. increases the number of cycles in a pulse and increases penetration c. causes poor axial and lateral resolution d. reduces the duty factor and increases the range of transmitted frequencies Far zone beam divergence can be reduced on a single-element transducer by using a. a transducer with a smaller element diameter b. a higher frequency transducer c. a lower frequency transducer or a smaller element diameter d. adjustable focusing The area between the face of an unfocused single-element transducer and the point where the beam starts to diverge is the a. Fraunhofer zone b. refraction zone c. focal zone d. near zone Assuming a fixed frequency, what happens if the diameter of an unfocused transducer is increased? a. the far zone divergence increases b. the penetration decreases c. the length of the near zone increases d. the length of the near zone decreases Which of the following does NOT affect lateral resolution? a. focusing b. element diameter c. frequency d. bandwidth