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  1. Opens at 50° before bottom dead center and closes at 15° after top dead center
  2. Opens at bottom dead center and closes at top dead center
  3. Opens at 50° after bottom dead center and closes at 15° before top dead center
  4. May open and close anywhere
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1 Answers

Answer: Option 1

The exhaust valve in a four stroke cycle petrol engine Opens at 50° before bottom dead center and closes at 15° after top dead center

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