Automobile Engineering in ME
If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on

Too lean mixture
Stoichiometric mixture
Most economical mixture
Too rich mixture

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Automobile Engineering in ME
The purpose of a cylinder head gasket is to

Prevent the combustion gases from leaking from the joint between the cylinder block and the cylinder head
Removes impurities from cylinder head lubricating oil
None of these
Prevent engine oil from going into combustion chamber

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