Annex A – NDE

Question 1

Dual–element UT transducers have the ability to measure thin sections from (Open Book):

A. 0.025” – 1.000”.
B. 0.025” – 2.000”.
C. 0.050” – 0.500”.
D. 0.050” – 1.000”.
E. 40oF to 125oF. (Oops, right answer for a different question!)

Answer 1

D (A.1)

Question 2

Which of the following is correct concerning the use of dual–element UT transducers?

A. If wall thicknesses less than 0.100” the meter accuracy is +/- 10%.
B. If thickness < 0.050”, the meter will provide no reading or a false reading.
C. These transducers are used in the “Echo-to-Echo mode”.
D. These transducers are commonly used in Phased Array inspections.

Answer 2

B (A.1)

Question 3

Which of the following is not an advantage of a Single–crystal UT transducers?

A. Possible to determine wall thickness even with coatings up to 0.100”.
B. Can be used in the “Echo-to-Echo mode”.
C. Has very good resolution for small diameter deep pits.

Answer 3

C (A.1)

Question 4

When UT corrosion mapping is performed, the recommended minimum transducer overlap between scanning passes is:

A. 5% of the transducer diameter.
B. 10% of the transducer diameter.
C. 25% of the transducer diameter.
D. 0.250”.

Answer 4

B (A.2)

Question 5

When UT scanning is performed, larger diameter transducers:

A. will not find small diameter deep pits.
B. are more difficult to calibrate (compared to smaller transducers).
C. have a slower maximum scanning speed (compared to smaller transducers).
D. work best in the “Echo-to-Echo mode”.

Answer 5

A (A.2)

Question 6

Phased Array Ultrasonics is often used:

A. also as a PMI tool.
B. as a substitute for RT after weld repairs.
C. for thickness mapping and detection of mid-wall discontinuities.
D. for solving world hunger.

Answer 6

C (A.2)

Question 7

Angle Beam Ultrasonics is often used:

A. also as a PMI tool.
B. as a substitute for RT after weld repairs.
C. for thickness mapping and detection of mid-wall discontinuities.
D. to provide a C-Scan image.

Answer 7

B (A.3)

Question 8

MFL floor scans typically cover:

A. 80% of the floor.
B. 85% of the floor.
C. 90% of the floor.
D. 98% of the floor.

Answer 8

A (A.4)

Question 9

A robotic tool is used to scan the floor while the tank is in service. Which of the following is true?

A. This scan normally covers about 80% of the floor.
B. This is relatively an inexpensive floor scan.
C. This tool normally uses Eddy Current technology.
D. Data from the scan is inputted into a statistical model to project the thinnest remaining thickness of the bottom.

Answer 9

D (A.5)