Automobile Engineering in ME
The battery is an electrochemical device, which means battery

Makes chemicals by mechanical means
Uses chemical action to provide electricity
Does not use an electrolyte
Has curved plates instead of flat plates

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Automobile Engineering in ME
The ignition in a spark ignition engine takes place when the piston is

Exactly at the T.D.C. position on its compression stroke
Approaching the T.D.C. position on its compression stroke
Leaving the T.D.C. position on its compression stroke
Approaching the T.D.C position on its exhaust stroke

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