1. Opens at T.D.C. and closes at B.D.C.
  2. Opens at 20° before T.D.C. and closes at 35° after B.D.C.
  3. Opens at 10° after T.D.C. and closes at 20° before B.D.C.
  4. None of the above
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1 Answers

Answer: Option 2

In a four speed four stroke Diesel engine, the intake valve Opens at 20° before T.D.C. and closes at 35° after B.D.C.

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