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Question: Answered & Verified by Expert
A knocking sound is produced in the engine when the fuel
ChemistryElectrochemistryNEET
Options:
  • A burns fast
  • B burns slowly
  • C is contaminated with lubricating oil
  • D contains some water
Solution:
1398 Upvotes Verified Answer
The correct answer is: burns fast
In fast burning total fuel is not burnt and unburnt fuel produces knocking.

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