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
In bias ply tyres

All of these
Belts of steel mesh are used in the tyres
All plies run parallel to one another
One ply layer runs diagonally one way and another layer runs diagonally the other way

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Automobile Engineering in ME
The starting system includes

A battery, a distributor, and an ignition switch
A distributor, a starter, and an ignition switch
A battery, a starter, and an ignition switch
A battery, a starter, and a distributor

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