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Determination of flatness using Prussian blue is used for which kind of surfaces?

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Determination of flatness using Prussian blue is used for which kind of surfaces?

(a) Small surfaces

(b) Large surfaces

(c) Both large and small surfaces

(d) For surfaces with fine smoothness

I got this question during an online interview.

My question comes from Flatness Testing in chapter Straightness, Flatness, Squareness, Parallelism, Circularity and Rotation of Engineering Metrology

1 Answer

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Correct answer is (a) Small surfaces

The explanation: This method is suitable for small surfaces rather than large surface. This method is assumptious and may give more errors in determination of flatness in large surfaces.

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