Which of the following methods is not recommended for pre-cleaning prior to a liquid penetrant test:

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Mr. Dubey

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Q. Which of the following methods is not recommended for pre-cleaning prior to a liquid penetrant test:

(A) Steam cleaning, etching, rust and paint removal
(B) Solvent wipe, vapour degreasing, ultrasonic bath cleaning
(C) Blasting, grinding, filing, honing, machining
(D) All of the listed methods are not recommended

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✅ Correct Answer: (D) All of the listed methods are not recommended

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