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How many minimum sides to be measured of a cylinder to test parallelism?

(a) 1

(b) 2

(c) 3

(d) 4

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My question is taken from Parallelism, Equidistance and Coincidence in section Straightness, Flatness, Squareness, Parallelism, Circularity and Rotation of Engineering Metrology

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Right choice is (b) 2

For explanation: Parallelism can be defined as the tolerance which controls the parallelism between two features. It is possible to find the parallelism of the cylinder by measuring the two sides of a cylinder.

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