Why are flexible couplings incorporated into power transmission shafts _____________________?
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Answer: D. it prevents shock transmission and eliminates stress reversals
Explanation
Flexible couplings absorb angular and axial misalignment between coupled rotating shafts. This compliance prevents shock load transmission and eliminates damaging stress reversals in shafts. Protecting drive components from sudden impacts extends the operational lifespan of machinery. Rigid couplings require perfect alignment, whereas flexible couplings tolerate minor installation errors. Elastomeric inserts or flexible metallic disks provide the necessary compliance in these couplings. Stress reversals can lead to fatigue failure if shafts are rigidly locked under slight misalignment.
Electric motors connected to industrial pumps and compressors always incorporate flexible shaft couplings. Power transmission reliability improves significantly when thermal expansion misalignment is absorbed safely. Maintenance technicians use flexible couplings to protect gearboxes from shock loads during startup. Option A focuses on disassembly ease, which is a secondary convenience rather than the primary purpose. Option B describes clutch mechanisms designed for frequent engagement and disengagement tasks. Option E mentions increased shaft life as an outcome, but D details the exact mechanical mechanism.
- Subject
- Engineering
- Category
- Mechanical Engineering
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- —
- Difficulty
- medium
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