Automobile Engineering in ME
The gear shift lever requires two separate motions to shift gears, and the first movement

Meshes the gears
Moves the synchronizer
Selects the synchronizer
Operates the clutch

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

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

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