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  1. Opens at 20° before top dead center and closes at 40° after bottom dead center
  2. Opens at 20° after top dead center and closes at 20° before bottom dead center
  3. Opens at top dead center and closes at bottom dead center
  4. May open and close anywhere
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1 Answers

Answer: Option 1

In a four stroke cycle diesel engine, the inlet valve Opens at 20° before top dead center and closes at 40° after bottom dead center

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