Which of the following is classified as a lower pair_______________?
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Answer: D. all of the above
Explanation
Shafts in bearings, straight-line mechanisms, and steering gears all rely on surface contact lower pairs. Lower pairs feature area contact between the mating elements of the kinematic pair. This surface contact distributes loads effectively, making all listed options valid examples. Kinematic pairs are classified as lower or higher based on whether they have surface or point contact. Pin joints, sliding blocks, and journal bearings are classic examples of lower pairs. Lower pairs generally exhibit higher load capacities and lower wear rates than higher pairs.
Industrial machinery design relies heavily on lower pairs for heavy-duty load transmission. Automotive suspension and steering systems incorporate various lower pairs for reliable movement. Engineers analyze pair classifications to determine wear characteristics and lubrication needs. Option A describes journal bearings, which are lower pairs but represent only one valid choice. Option B describes straight-line mechanisms that also utilize surface contact lower pairs. Option C names steering gears that likewise incorporate lower pair pin and journal connections.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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