Automobile Engineering in ME
The two kinds of piston rings are

Compression and oil control rings
Pressure and sealing rings
Compression and sliding seal rings
Oil scrapper and oil control rings

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Automobile Engineering in ME
In which of the following conditions, the idle CO percentage should be measured with the vehicle?

Headlights and other lights are switched off
Headlights are switched on
Headlights and other electrical devices are switched off
Headlights and other electrical devices are switched on

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