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

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
Returns cylinder head lubricating oil to the oil pan at high speed
Removes impurities from cylinder head lubricating oil

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Automobile Engineering in ME
The condition that causes vapour locking in a brake system is

An excessively high engine speed on a downhill road
Overcooling of the brakes during high speed driving
Keeping the vehicle without use for an extended period
Overheating of the fluid due to frequent brake application

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