A rectangular bar fitted inside a matching rectangular hole is an example of what pair type__________________?
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Answer: A. completely constrained motion
Explanation
A rectangular bar fitted inside a matching hole can only move back and forth linearly. The geometry of the mating rectangular surfaces completely prevents any rotation or lateral drift. Since motion is restricted to a single predefined path, it is classified as completely constrained. Constrained motion occurs when relative movement between elements is restricted to a specific direction. Completely constrained motion happens independently of external forces due to geometric constraints. Machine elements rely on precise fits to ensure accurate guiding and alignment during operation.
Machine tool slides and key-shaft connections utilize rectangular fits to transmit linear or rotary drive. Accurate geometric constraints prevent binding and ensure smooth mechanical power transmission in assemblies. Manufacturing tolerances must be tight to maintain completely constrained motion without excessive friction. Option B implies partial freedom, which contradicts the restrictive nature of a tight rectangular fit. Option C describes motion in more than one direction, which is prevented by the rectangular geometry. Option D introduces a non-standard kinematic term not applicable to tight sliding fits.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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