Farm Power · Farm Power · 1 mark · Multiple choice
A four-stroke diesel inlet opens10° before TDC/closes40° after BDC. Exhaust opens25° before BDC/closes15° after TDC. What percentage of a cycle has both valves closed?
The closed-valve interval runs from inlet closure40° after intake BDC until exhaust opening25° before expansion BDC. It includes $(180-40)+(180-25)=295^\circ$. A four-stroke cycle is 720°,so the fraction is $295/720\times100=40.9722\%$. Hence **40.97%,B**.
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