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

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

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Automobile Engineering in ME
The rigid suspension is beneficial when

Large changes in load make it necessary to have a large suspension stroke
It is desired to improve tyre to ground contact characteristics
It is desired to have more flexibility in design
It is desired to reduce the unsprung mass

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

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
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
Recharging of a maintenance free battery is neither required nor possible

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