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

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Automobile Engineering in ME
The function of an oil control orifice is that it

Returns cylinder head lubricating oil to the oil pan at high speed
Regulates the pressure of engine oil supplied by the oil pump for the lubrication of cylinder head mechanism and other purposes
Turns oil into fine mist for spray lubrication
Removes impurities from cylinder head lubricating oil

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