CWI Nondestructive Examination Methods 2

Question 1

When performing liquid penetrant testing, what is the purpose of the dwell time?

Accepted Answer

To allow the penetrant to seep into surface-breaking discontinuities

Answer

Dwell time allows the penetrant to enter surface-breaking discontinuities through capillary action.

Question 2

Which ultrasonic testing technique uses two separate transducers, one for sending and one for receiving?

Accepted Answer

Pitch-catch

Answer

The pitch-catch (through-transmission) technique uses separate transmitter and receiver transducers.

Question 3

In radiographic testing, what does a higher kilovoltage (kV) setting primarily affect?

Accepted Answer

Penetrating power of the X-rays

Answer

Higher kV increases the energy and penetrating power of X-rays, allowing inspection of thicker materials.

Question 4

What type of magnetic particle indication appears as a tight, sharp line and is typically associated with a crack?

Accepted Answer

Sharp linear indication

Answer

Cracks produce sharp, well-defined linear indications because the magnetic flux leakage is concentrated at the tight discontinuity.

Question 5

An eddy current test is being performed on a non-ferromagnetic tube. Which property does NOT significantly affect the eddy current signal?

Accepted Answer

Magnetic permeability

Answer

Non-ferromagnetic materials have a relative magnetic permeability of 1, so permeability does not affect eddy current signals in these materials.

CWI Practice Test