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S.Thomson
S.Thomson
09:22 Jun-04-2003
quiz qeustion queries

I need some conformation on some questions.

Q1 Standing waves are generated in ut testing for
a. B-scans
b. through testing
c. resonance thickness testing
d. flaw detection

Q2 Touching the reflection point of a normally incident transverse wave with an oily finger will
a. reduce signal by about 6dB
b. increase the signal by about 2dB
c. reduce the signal by about 2dB
d. have no effect on the signal

Q3 The result of increasing the temp from 10deg C to 30 deg C is
a. decrease the refracted angle
b. decrease the acoustic velocity
c. increase sensitivity
d. all of the above

Q4 The unit of sound (or electrical energy) gain or attenuation , dB is
a. a ratio of voltages or intencities
b. one tenth of a bell
c. both a and b

Q5 Non contact ultrasonic coupling , ie coupling across an air gap has its advantage in
a. testing at elevated temperatures is possible
b. avoiding trasducer wear on rough surfaces
c. avoiding fluid contamination of test piece
d. all of the above

Q6 An advantage of using ut surface waves over other wave modes is
a. the ease of focusing the beam
b. test piece contours are followed without loss of due to direction changes
c. good sensitivity to subsurface defects
d. none of the above

Q7 In snells law there will be no first criticle angle if the
a. acoustic impedance of the refracting medium is greater than 1
b. acoustic velocity in the refracting medium is less than in the incident medium
c. incident angle does not exceed 89 degrees
d. none of the above there will always be a first critical angle





 
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