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Press fit on elastic shaft, may define pairs of nodes on the contacting boundary, each pair consisting of one node on the _____ and one on the ______

(a) Shaft and couple

(b) Sleeve and shaft

(c) Shaft and sleeve

(d) Sleeve and couple

I have been asked this question during an online exam.

This question is from Axis Symmetric Problem Modelling and Boundary Conditions in chapter Axis Symmetric Solids Subjected to Axis Symmetric Loading of Finite Element Method

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Right option is (b) Sleeve and shaft

For explanation: A shaft is a rotating machine element, usually circular in cross section, which is used to transmit power from one part to another, or from a machine which produces power to a machine which absorbs power. A flexible shaft or an elastic shaft is a device for transmitting rotary motion between two objects which are not fixed relative to one another.

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