Level I
1. A qualitative description of the sustained signal level produced by rapidly occurring acoustic emission events is the accepted definition for:
a. burst emission.
b. acoustic emission signature.
c. acoustic emission signal.
d. continuous emission.
2. Attenuation of a wave is best defined by which statement?
a. A decrease in frequency with distance traveled.
b. A decrease in amplitude with distance traveled.
c. A decrease in wave speed with distance traveled.
d. A change in direction as a function of time.
3. The number of times the acoustic emission signal exceeds a preset threshold during any selected portion of a test is called the acoustic emission
a. response
b. count
c. count rate
d. energy
