CRI IQI Selection & Radiographic Sensitivity 3

Question 1

For a double-wall single-image (DWSI) technique, the IQI thickness designation is selected based on which thickness?

Accepted Answer

The nominal single-wall thickness of the wall being evaluated

Answer

In DWSI technique, the IQI is selected based on the single-wall thickness being evaluated (typically the far wall), not the total two-wall path thickness.

Question 2

When radiographing a carbon steel weld, which IQI material should be selected?

Accepted Answer

Steel IQI of radiographically similar composition to the test material

Answer

The IQI must be fabricated from the same material group as the test object so that its X-ray absorption properties accurately represent the sensitivity achieved in the actual material.

Question 3

What is the primary purpose of a step-wedge calibration film used in conjunction with radiographic examination?

Accepted Answer

To verify film density levels and confirm consistent film processing conditions

Answer

Step-wedge calibration films verify that film density and processing are within acceptable limits, ensuring consistent film quality independent of the IQI sensitivity function.

Question 4

According to ASME Section V, what radiographic sensitivity level is typically required for pressure vessel weld examination?

Accepted Answer

2% sensitivity (2T essential hole must be visible)

Answer

ASME Section V requires 2% sensitivity, meaning the 2T essential hole in the IQI appropriate for the material thickness must be clearly visible on the radiograph.

Question 5

An IQI with a designation number of 10 has what nominal thickness?

Accepted Answer

0.010 inches

Answer

Hole-type IQI designation numbers directly represent the IQI nominal thickness in thousandths of an inch; designation 10 equals 0.010 inches (10 thousandths).

(CRI) Certified Radiographic Interpreter Practice Test

(CRI) Certified Radiographic Interpreter Practice Test

CRI IQI Selection & Radiographic Sensitivity 3