Automobile Engineering in ME
A battery can be charged by

Adding sulphuric acid
Adding distilled water
Applying voltage in the reverse direction to that of charging
Applying a voltage in the same direction to that of charging

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Automobile Engineering in ME
The function of a first compression ring (top ring) is that it

Creates swirl
Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber
Maintains a seal and prevents the fuel leakage
Increases the combustion temperature

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

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

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