Piston rings are conventionally fabricated using___________________?
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Answer: A. cast iron
Explanation
Piston rings are traditionally manufactured from high-grade grey cast iron materials. Grey cast iron provides excellent wear resistance elasticity and self-lubricating graphite properties. These mechanical characteristics ensure reliable sealing against cylinder walls under high temperatures. Piston rings seal combustion chambers and control lubricating oil films in reciprocating engines. Materials must withstand severe friction sliding wear and high thermal fatigue conditions. Graphite flakes within grey cast iron provide micro-reservoirs for retaining lubricating engine oil.
Automotive and marine internal combustion engines rely on cast iron piston rings for durability. Engine designers select ring materials to minimize cylinder bore wear over millions of cycles. Proper material selection ensures efficient engine compression and low oil consumption. Aluminium is used for pistons themselves due to low weight rather than for piston rings. Phosphor bronze is used for bearing bushes rather than reciprocating piston sealing rings. Babbitt metal is a soft bearing lining alloy unsuitable for high-stress piston ring applications.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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