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

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

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Automobile Engineering in ME
The composition of the electrolyte in a fully charged battery is that

The electrolyte is pure sulphuric acid
The electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight
The electrolyte is pure distilled water
The electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight

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