In acoustic emission testing, vibrations are detected by a ...

[123654777]

In acoustic emission testing, vibrations are detected by a transducer after a machine part has been subject to the
  release of _____.
 
  a. sparks
  b. lubricant
  c. sound
  d. energy

Question 2

In acoustic emission testing, vibrations are detected by a transducer after a machine part has been subject to the
  release of _____.
 
  a. sparks
  b. lubricant
  c. sound
  d. energy

[rleezy04]

Answer to Question 1

d

Answer to Question 2

d

[123654777]

Great answer, keep it coming

[strudel15]

Thanks for the timely response, appreciate it