Automobile Engineering in ME
The aluminium alloy is used in cylinder blocks because

Material cost is low
The piston is also made of aluminium alloy
It is lighter and has good heat dissipation characteristics
It does not require any cylinder liners

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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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