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

A maintenance free battery requires little maintenance during normal use and it is sufficient to add water instead of an electrolyte containing sulphuric acid
A maintenance free battery has a relatively short shelf life when compared with standard batteries
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

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Automobile Engineering in ME
The basic purpose of a four wheel drive (4WD) system is that it

Ensures that effective braking can be performed, even on slippery surfaces
Delivers improved cornering on dry road surfaces
Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces
Eliminates the need of snow tyres, tyre chains, etc.

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