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  1. Opens at 30° before bottom dead centre and closes at 10° after top dead centre
  2. Opens at 30° after bottom dead centre and closes at 10° before top dead centre
  3. Opens at bottom dead centre and closes at top dead centre
  4. May open and close anywhere
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1 Answers

Answer: Option 1

In a four stroke cycle diesel engine, the exhaust valve Opens at 30° before bottom dead centre and closes at 10° after top dead centre

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