Internal Combustion Engines
Which of the following statement is correct regarding normal cetane?

It is a standard fuel used for knock rating of diesel engines
All of these
Its chemical name is normal hexadecane
It has long carbon chain structure

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Internal Combustion Engines
Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?

Exhaust valve closing after top dead center
Inlet valve closing after bottom dead center
Inlet valve closing before bottom dead center
Inlet valve opening before top dead center

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