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In S.I engine the intake valve closes __________

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In S.I engine the intake valve closes __________

(a) At BDC

(b) At TDC

(c) 25 degree to 84 degree after BDC

(d) 10 degree to 20 degree before TDC

The question was asked by my college professor while I was bunking the class.

I want to ask this question from Energy Cycle in chapter Internal Combustion Engines of Automobile Engineering

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Right choice is (c) 25 degree to 84 degree after BDC

The explanation is: The intake valve closes at 25 degree to 84 degree after BDC.

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