Automobile Engineering in ME
The process of supplying the intake air to the engine cylinder at a pressure greater than the pressure of the surrounding atmosphere is known as

Detonation
Scavenging
Auto ignition
Supercharging

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Automobile Engineering in ME
The function of a first compression ring (top ring) is that it

Increases the combustion temperature
Maintains a seal and prevents the fuel leakage
Creates swirl
Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber

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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
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

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