CWI Nondestructive Examination Methods Questions and Answers

Question 1

An inspector performing Liquid Penetrant Testing (PT) on a non-porous component correctly completes the pre-cleaning, penetrant application, and dwell time steps.
What is the immediate next step required to ensure an accurate inspection?

Accepted Answer

Remove the excess penetrant from the surface.

Answer

Apply a thick layer of developer to the surface.

Answer

Inspect the component under high-intensity white light.

Answer

Heat the component to accelerate developer action.

Question 2

Which of the following Nondestructive Examination (NDE) methods is most effective for detecting fine, surface-breaking cracks in a carbon steel weldment?

Accepted Answer

Magnetic Particle Testing (MT)

Answer

Radiographic Testing (RT)

Answer

Visual Testing (VT)

Answer

Ultrasonic Testing (UT)

Question 3

During an Ultrasonic Test (UT) of a thick plate, a technician uses a transducer to send high-frequency sound waves into the material. The fundamental principle that allows for the detection of an internal flaw, such as porosity or a crack, is that the sound waves will:

Accepted Answer

be reflected by the boundary of the flaw.

Answer

be absorbed completely by the flaw.

Answer

change their frequency upon contacting the flaw.

Answer

increase in velocity as they pass through the flaw.

Question 4

A key limitation of Liquid Penetrant Testing (PT) is its inability to:

Accepted Answer

detect subsurface or internal discontinuities.

Answer

be used on non-ferrous metals such as aluminum.

Answer

detect discontinuities that are open to the surface.

Answer

be used on parts with complex geometries.

Question 5

In Radiographic Testing (RT) of a weld, an Image Quality Indicator (IQI), or penetrameter, is placed on the part during the exposure. What is the primary purpose of the IQI?

Accepted Answer

To verify that the radiographic technique was sensitive enough to detect relevant discontinuities.

Answer

To measure the exact size and depth of any detected flaw.

Answer

To determine the specific alloy of the material being tested.

Answer

To provide a reference for the correct film processing time and temperature.

Question 6

An inspector using Magnetic Particle Testing (MT) identifies an accumulation of magnetic particles caused by an abrupt change in the part's geometry, such as a keyway or a sharp fillet radius. This type of indication should be classified as:

Accepted Answer

A non-relevant indication.

Answer

A relevant indication.

Answer

A false indication.

Answer

A processing discontinuity.

An inspector performing Liquid Penetrant Testing (PT) on a non-porous component correctly completes the pre-cleaning, penetrant application, and dwell time steps.What is the immediate next step required to ensure an accurate inspection?

An inspector performing Liquid Penetrant Testing (PT) on a non-porous component correctly completes the pre-cleaning, penetrant application, and dwell time steps.
What is the immediate next step required to ensure an accurate inspection?