Automobile Engineering in ME
The lubrication oil flow in an engine is in the order as

Oil pump, oil strainer, relief valve, oil filter, cylinder block, cylinder head and oil pan
Oil strainer, oil pump, relief valve, oil filter, cylinder block, cylinder head and oil pan
Oil strainer, oil filter, relief valve, oil pump, cylinder block, cylinder head and oil pan
Oil strainer, oil pump, relief valve, oil filter, cylinder head, cylinder block and oil pan

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Automobile Engineering in ME
The auto ignition in a spark ignition engine means

Ignition induced to supplement the process of normal combustion
Ignition induced by the passage of a spark
Automatic ignition of the charge at the end of compression
Ignition of the charge before the passage of flame front

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