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

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

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Automobile Engineering in ME
The function of a first compression ring (top ring) is that it

Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber
Maintains a seal and prevents the fuel leakage
Creates swirl
Increases the combustion temperature

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