Automobile Engineering in ME
The main characteristics of a maintenance free (MF) battery is that

Recharging of a maintenance free battery is neither required nor possible
Since it is sealed, the water in maintenance free battery is not lost through evaporation thus accordingly it is not necessary to top up the cells with water
A maintenance free battery has a relatively short shelf life when compared with standard batteries
A maintenance free battery requires little maintenance during normal use and it is sufficient to add water instead of an electrolyte containing sulphuric acid

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Automobile Engineering in ME
The composition of the electrolyte in a fully charged battery is that

The electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight
The electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight
The electrolyte is pure sulphuric acid
The electrolyte is pure distilled water

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

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