Automobile Engineering in ME
The basic purpose of providing caster angle on wheels is to

Prevent uneven tyre wear
Compensate for wear in the steering linkage
Maintain directional control
Bring the road contact of the tyre under the point of load

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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
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
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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