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In a four stroke S.I engine the exhaust valve usually opens ______

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in Automobile Engineering by (80.5k points)
In a four stroke S.I engine the exhaust valve usually opens ______

(a) At BDC

(b) 35 degree to 60 degree before BDC

(c) 35 degree to 60 degree after BDC

(d) 10 degree to 20 degree before BDC

This question was posed to me in an international level competition.

Query is from Energy Cycle topic in division Internal Combustion Engines of Automobile Engineering

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The correct option is (b) 35 degree to 60 degree before BDC

The best I can explain: Exhaust valve opens at 35 degree to 60 degree before BDC.

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