Automobile Engineering in ME
A battery can be charged by

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

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Automobile Engineering in ME
The auto ignition in a spark ignition engine means

Automatic ignition of the charge at the end of compression
Ignition induced by the passage of a spark
Ignition of the charge before the passage of flame front
Ignition induced to supplement the process of normal combustion

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