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

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

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Automobile Engineering in ME
In a ventilated disc brake

Caliper is covered with cooling fins
Disc contains many small holes for optimum cooling performance
Disc contains radial vanes between its rubbing surfaces for optimum cooling performance
A duct directs air towards the caliper for cooling while the vehicle is moving

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