Eddy Current Testing (ET) Multiplle Choice Question & Answer (MCQ)

1. Which NDT method uses an alternating current (AC) coil

(a) Visual Testing (VT)
(b) Ultrasonic Testing (UT)
(c) Dye-Penetrant Testing (PT)
(d) Eddy Current testing (ET)

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Answer is (d)

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2. In Eddy current testing typically used frequency range of AC is

(a) 1KHz to 10 KHz
(b) 1KHz to 100 KHz
(c) 1KHz to 10 MHz
(d) 10Hz to 50Hz

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Answer is (c)

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3. Which of the following NDT method can detect surface cracks

(a) Visual Testing (VT)
(b) Dye-Penetrant Testing (PT)
(c) Eddy Current testing (ET)
(d) All of the above

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Answer is (d)

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4. Eddy current testing can be used to

(a) Measure the thickness of nonconductive coatings on conductive surfaces
(b) Detect surface & sub surface cracks
(c) Both a & b
(d) None of the above

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Answer is (c)

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5. Changes in heat treatment can be measured using which NDT method

(a) Visual Testing (VT)
(b) Dye-Penetrant Testing (PT)
(c) Eddy Current testing (ET)
(d) All of the above

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Answer is (c)

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6. Increasing the AC frequency in Eddy current testing will

(a) Increase the depth of penetration
(b) Reduce the depth of penetration
(c) Decrease the sensitivity to flaws
(d) None of the above

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Answer is (b)

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7. In Eddy current testing, which component features should be similar to the reference standard

(a) Material Thickness
(b) Material geometry
(c) Material conductivity
(d) None of the above

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Answer is (c)

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8. Eddy Current Testing reveals flaws as

(a) Indirect indications
(b) Direct indications
(c) Indirect & Direct indication both
(d) None of the above

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Answer is (a)

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