What is the main operational drawback of a sliding pair mechanism_________________?
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Answer: D. A. and B. above
Explanation
Sliding pair mechanisms suffer from high sliding friction, leading to rapid surface wear and increased bulkiness. The large contact area between sliding members requires robust lubrication and sturdy housings to handle loads. These combined drawbacks make sliding pairs less efficient than rolling element alternatives in many applications. Sliding pairs involve surface contact where mating elements rub against each other during relative motion. Frictional heat generated in sliding pairs can cause thermal expansion and mechanical binding if clearances are tight. Materials like bronze bushings and steel guide rails are paired to minimize friction and wear rates.
Machine tool slide ways use specialized hardened guides and lubrication systems to combat rapid sliding wear. Engine designers replace sliding valve guides with roller followers in high performance racing engines. Understanding wear mechanisms helps engineers select appropriate surface coatings and maintenance intervals. Being bulky is a valid drawback, but rapid wear is equally significant, making combined options correct. Difficult manufacturing is also a factor, but high friction wear and bulkiness are the primary operational issues. Options omitting wear or bulkiness fail to capture the complete set of operational disadvantages.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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