Automobile Engineering in ME
The advantage of the fuel injection system over the carburettor system is

All of the listed here
Improved emission
Improved fuel efficiency
Improved power output

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

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

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