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Home └Eddy Current Testing (ET) - Level II └ET II Specific - Set 2

Eddy Current Testing (ET) - Level II

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ET II Specific - Set 2

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1. For an encircling-coil production test, the reference standard should be:
The same product in material, size and condition, with artificial discontinuities such as drilled holes or notches, run at production speed Any tube from stock, regardless of alloy A flat notch block intended for surface probes A conductivity standard
2. In encircling-coil testing of bar or tube, the ends of each length:
Need no special consideration Always give the best sensitivity Are always rejected Often cannot be reliably examined because of end effect, so the untested length must be handled per the specification
3. A mill is setting up encircling-coil testing of nickel alloy tube. Which ASTM standard is written for this product?
E376 E1004 E571 E2096
4. During production testing of steel tube with DC saturation, the reference standard signals are unstable and noisy. A likely cause is:
A fill factor that is too high Incomplete magnetic saturation Too low a line speed A thin nonconductive coating
5. A procedure (example) requires standardization checks at the start, every 4 hours and at the end. Which event should also prompt a check?
Changing the probe, extension cable or instrument Moving to the next tube in the same bundle A change of shift supervisor with no equipment change Starting to write the report
6. Standardization was verified acceptable at 10:00. At 14:00 the reference signal is well outside tolerance. Which items must be re-examined?
None, provided the end-of-shift check passes Only items that showed indications Only the last item examined All items examined since the 10:00 check, after restandardizing
7. Which information belongs on an eddy current technique sheet?
The examiner's full training records Only the client's name and purchase order Probe type and size, test frequencies, phase and gain settings, and the reference standard identification Acceptance criteria copied from an unrelated code
8. Under SNT-TC-1A, who is responsible for establishing and approving written eddy current procedures?
The Level II performing the examination The NDT Level III The Level I technician The client's purchasing agent
9. Apart from setting up, standardizing and evaluating, which further duty does SNT-TC-1A assign to an ECT Level II?
Providing on-the-job training and guidance to trainees and Level I personnel Approving the employer's written practice Writing and approving new procedures without Level III review Administering Level III examinations
10. A client asks the Level II to adjust settings so that a tube with a rejectable indication will pass. The correct response is to:
Delete the data for that tube Reduce the gain until the indication disappears Rotate the phase to hide the indication Report the results as found per the procedure and raise the issue with supervision or the Level III
11. During tube analysis, a support plate signal looks distorted compared with the clean support signals in the same tube. It should be:
Recorded as a dent without further review Dismissed as geometry Treated as potentially relevant and evaluated further, for example with the mix channel or a rotating probe Removed from the data file
12. In heat exchanger programs, rotating probes such as motorized pancake coils are mainly used to:
Replace standardization Characterize indications flagged by the bobbin, such as crack orientation and position around the circumference Test ferromagnetic tubes without saturation Measure the tube's conductivity
13. A bobbin coil is least sensitive to which flaw orientation in tubing?
Circumferential cracks Axial cracks Volumetric pits Through-wall holes
14. A 2024 aluminum part reads within the expected T3 conductivity band (about 30% IACS). Under good practice this:
Means the part must be rejected Proves both the alloy and the temper conclusively Shows the part is 7075 Shows the part is consistent with T3; where the specification requires, hardness testing is used to confirm
15. When measuring conductivity, the part, the reference standards and the probe should be:
Cooled below 0 °C Heated to 100 °C At the same, stable temperature Wetted with water
16. When measuring paint thickness by liftoff, why should the uncoated standardization substrate be the same alloy as the part?
Paint color affects the eddy current reading Substrate conductivity changes the liftoff response, so a different alloy gives a thickness error The alloy affects only ferromagnetic paints The substrate makes no difference to the reading
17. When scanning close to the edge of an aircraft skin panel, how can edge-effect false calls be reduced?
Use a shielded probe and an edge guide that keeps a constant distance from the edge Increase the gain Lower the frequency to about 50 Hz Scan faster
18. During a pencil-probe scan the operator lets the probe tilt. The resulting signal mainly resembles:
A through-wall hole A deep surface crack An increase in conductivity Liftoff
19. After setting an alarm gate during standardization on a notch block, the Level II should:
Re-null the instrument with the probe on the notch Remove the gate before scanning Prove that the reference notch trips the alarm on repeated passes Raise the test frequency
20. A heat exchanger eddy current report should include, among other items:
Only the number of tubes plugged The procedure and revision, equipment and probe details, reference standard ID, standardization times, results, and the examiner's name, level and signature Only the instrument model Only the client's name