Which of the following mechanisms is derived from a lower pair________________?
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Answer: E. all of the above
Explanation
Lower pair mechanisms form the basis for various devices including gyroscopes and pantographs. Surface contact in lower pairs ensures stable force transmission in these machines. Complex mechanical systems integrate multiple lower pairs to achieve desired kinematic outputs. Lower pairs feature surface-to-surface contact between kinematic elements under load. Examples include pin joints, sliding pistons, and threaded screw fasteners. They typically exhibit lower wear rates due to distributed contact stresses.
Aerospace navigation systems utilize gyroscopes built with precision lower pair bearings. Valve gear assemblies in industrial engines rely on lower pairs for reliable actuation. Precision instruments depend on stable lower pair connections to maintain calibration. Option A names only gyroscopes, ignoring pantographs and valve gears listed elsewhere. Option B lists pantographs but misses gyroscopes and other lower pair applications. Option C highlights valve gears while omitting the other valid mechanism examples.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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