Automobile Engineering in ME
The main feature of Macpherson strut suspension is that

The assembly is slightly more complicated in design
The unsprung mass in lighter
The vertical size of the suspension can be made more compact
Non vertical external forces are supported by the suspension arms

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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
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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Automobile Engineering in ME
In a ventilated disc brake

Caliper is covered with cooling fins
Disc contains many small holes for optimum cooling performance
A duct directs air towards the caliper for cooling while the vehicle is moving
Disc contains radial vanes between its rubbing surfaces for optimum cooling performance

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