UT-CW-04

What is the purpose of a couplant?

• To enable sound energy to pass from the probe to the test piece

• To protect the test piece

• all of above

Which of the following materials would have the highest attenuation?

• A fine grained material

• A coarse grained material

• all of above

What effect does beam spread have on sound attenuation?

• More beam spread, more attenuation

• Less beam spread, less attenuation

• Less beam spread, more attenuation

The piezo electric effect can perform which one of the following?

• Convert sound to mechanical energy

• Convert electrical energy into signals

• Convert electrical energy into mechanical energy

Which piezo electric crystal is the best transmitter of ultrasound?

• Barium titanate

• Quartz

• Lithium sulphate

Which piezo electric crystal is the best receiver of ultrasound?

• Quartz

• Lithium sulphate

What is the law of reflection?

• The angle of refraction = the angle of reflection

• The angle of incidence = the angle of reflection

• The angle of incidence = the angle of refraction

What is Snell’s law?

• sin α = V1

  sin β V2

• The angle of incidence = the angle of reflection

A change in wave form, together with a change in sound velocity, due to reflection or refraction is called....

• A mode change

• Pulse repetition frequency

An unwanted signal on the flaw detector screen is called....

• A spurious indication

• a mode change

• Diffraction