Q
QuestionEngineering

What must happen before fuel can be combusted? Select each correct answer. A. One valve needs to be opened while the other is closed. B. The camshaft must open both the intake and exhaust valves. C. The intake and exhaust valves must be closed. D. The valve timing must be perfectly optimized.
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Answer

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Step 1
I'll solve this problem step by step, focusing on the process of fuel combustion in an internal combustion engine.

Step 2
: Understanding Valve Operation in Combustion

In an internal combustion engine, specific valve operations are critical for fuel combustion. Let's analyze each potential condition:

Final Answer

The intake and exhaust valves must be closed.