General Studies · Valve Timing Diagram
Why is it generally necessary for the inlet valve to open a certain number of degrees before Top Dead Centre (T.D.C.)?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1To decrease the overall volumetric efficiency of the engine.
- 2To allow sufficient air or air-fuel mixture flow into the cylinders by the time the piston starts its downstroke.✓
- 3To increase the maximum combustion temperature artificially.
- 4To restrict the intake of charge at high speeds.
Correct answer
To allow sufficient air or air-fuel mixture flow into the cylinders by the time the piston starts its downstroke.
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