Automobile Engineering in ME
If the valve clearances are excessively large, the problem that can arise is

Overheating of the engine
Incomplete valve closure
None of the listed here
Fouling of spark plug by gasoline

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

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