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Questions and Answers
Ultrasonic testing technique pulse echo involves the introduction of light into a test object.
False
The time interval between the transmission and reception of pulses does not provide clues to the internal structure of the material.
False
Piezoelectric transducers are not used for converting electrical pulses to mechanical vibrations.
False
Commonly used piezoelectric materials include Li2CO3 and non-polarized ceramics.
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Modern computerized ultrasonic scanning systems cannot display data in A-scan, B-scan, and C-scan presentations simultaneously.
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Direct listening is greatly used by experienced operators as a means of detecting malfunction in moving machinery. True or False?
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Sound can be described in two dimensions (t, a), time and amplitude. True or False?
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Most machines emit consistent sound patterns under normal operating conditions. True or False?
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Sound is a microscopic oscillation at the molecular level of a substance. True or False?
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In ultrasonic testing, low-frequency sound waves are transmitted into a material to detect imperfections or to locate changes in material properties. True or False?
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