UT-CW-03

In which area of the ultrasonic beam do the edges of the wave diverge?

• The Fraunhoffer zone

• In the dead zone

What are “K” factors?

• Constants used in calculating beam spread

• Constants used in the near zone formula

• Variables used in calculating beam spread

What effect on beam spread does a change of probe, to one with the same diameter but a lower frequency, have?

• The half angle increases

• The half angle decreases

What effect on beam spread does a change of probe, to one with the same frequency but a larger diameter, have?

• The half angle increases

• The half angle decreases

What is PRF?

• Probe rate frequency

• Pulse rate frequency

• Pulse repetition frequency

What are boundary waves?

What is an alternative term used to describe longitudinal waves?

• Compression waves

• Shear waves

• Surface waves

What is acoustic impedance a product of?

• Material density and the velocity of sound through it

• Sound velocity through a material and its elasticity

• Material elasticity and specific gravity

What happens if an excessive PRF is set on the flaw detector?

• The Piezo Electric effect is lost

• Ghost echoes appear on the CRT

• Grass appears on the CRT

What is the clock interval?

• The time between pulses of energy leaving the probe

• The time between a pulse of energy returning to probe and the signal appearing on the CRT

• The time taken, for a pulse of energy, from leaving the probe to travel through a material and return