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Eddy Current Testing (ET) - Level II

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ET II Specific - Set 1

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1. In an ASME Section V Article 8 style bobbin reference standard, the flat-bottom holes of 80%, 60%, 40% and 20% wall depth are drilled from the:
Tube outside surface Tube inside surface Tube end face Tubesheet side only
2. During bobbin probe setup, the phase is commonly rotated so that the through-wall hole signal sits at about 40°. What is this convention for?
It gives a consistent reference so phase-to-depth curves can be built and compared It removes the need for a second test frequency It makes ID and OD flaws look identical It sets the fill factor
3. Relative to the through-wall reference, a shallow ID-initiated flaw on a differential bobbin channel typically rotates:
Nowhere, because ID flaws give no signal To the same angle as a 20% OD hole To exactly 40° In the opposite direction to shallow OD flaws
4. Why is a simulated support ring often fitted to the tube reference standard?
To hold the standard's serial number To improve the fill factor To magnetize the tube To generate a support signal for setting up and checking the support-suppression mix
5. What is the main purpose of a tubesheet map in a heat exchanger eddy current report?
To record instrument serial numbers To show tube identification, which tubes were examined, indications found, and tubes plugged or not examined To show the examiner's certification To display the phase-to-depth curve
6. A bobbin indication is sized at 45% through-wall. The owner's plugging limit in this example is 40%. What should the Level II do?
Report it as exceeding the owner's acceptance criterion so the owner can act, for example by plugging Re-size it until it reads below 40% Ignore it, because plugging limits are optional Plug the tube personally without reporting it
7. A dent stops the normal bobbin probe, so a smaller-diameter probe is used for those tubes. What must be done?
Standardize the smaller probe on the reference standard and record the reduced fill factor and the tubes affected Keep using the original probe's settings Report the tubes as acceptable without testing Raise the gain by 6 dB without standardizing
8. A tube cannot be examined full length because of a restriction. The report should:
List the tube as acceptable Leave the tube off the report List the tube as not examined, or examined to a stated extent, with the reason List the tube as plugged
9. Why should the bobbin probe be pulled at the same speed during examination as during standardization?
Speed changes the tube's conductivity Speed changes the flaw signal frequency, which interacts with the filters and can change amplitude and phase Speed changes the fill factor Speed has no effect on the signal
10. An illustrative phase-to-depth curve reads: 100% = 40°, 80% = 60°, 60% = 85°, 40% = 110°, 20% = 150°. An OD pit at 130° is approximately:
70% through-wall 50% through-wall 30% through-wall 10% through-wall
11. On a surface notch reference block, why are several EDM notch depths (for example 0.2, 0.5 and 1.0 mm) provided?
To calibrate the instrument's internal oscillator To measure coating thickness To check the part's conductivity To confirm that the response increases with depth and to set sensitivity at the depth the procedure requires
12. When setting up a pencil probe on a notch block, which step normally comes first after choosing the probe and frequency?
Scan the production part Set the alarm gate Null the instrument with the probe on a defect-free area of the block Rotate the phase until the notch signal is horizontal
13. A surface probe has an effective coverage width of 4 mm and the procedure requires 50% overlap. The maximum scan index is:
1 mm 2 mm 4 mm 8 mm
14. Fatigue cracks are expected to grow radially from fastener holes in an aluminum skin. A suitable surface-probe scan is:
A circular path around each fastener, so the probe crosses any radial crack A single straight line well away from the fasteners Only on top of the fastener heads Random spot checks between fasteners
15. A rotating bolt-hole probe has an effective coil width of 1.0 mm and turns at 600 rpm. What is the maximum forward speed for full coverage?
1 mm/s 10 mm/s 60 mm/s 600 mm/s
16. Before a bolt-hole eddy current examination, the hole should be:
Painted to protect it Filled with ultrasonic couplant Clean, with sealant and debris removed, and the probe adjusted for a snug fit Magnetized to improve sensitivity
17. In conductivity measurement per ASTM E1004, the instrument is standardized using:
A single standard well below the expected value Conductivity reference standards whose values bracket the expected value of the part A nonconductive plastic block Factory settings only, without standards
18. Conductivity is measured on aluminum sheet thinner than about three standard depths at the instrument frequency. The reading will typically be:
Unaffected by thickness Exactly correct Higher than the true conductivity Lower than the true conductivity
19. ASTM E376 covers measuring nonconductive coating thickness on a non-magnetic metal substrate. The instrument should be standardized with:
A tube reference standard Shims placed on any steel plate A conductivity standard only Nonconductive shims of known thickness on uncoated substrate of the same alloy and geometry as the part
20. Which ASTM standard covers eddy current examination of seamless and welded austenitic stainless steel and similar alloy tubular products?
E376 E1004 E426 E2096