Automobile Engineering in ME
In Spark Ignition Engine

Both (A) and (B)
The mixture of air and fuel is introduced into the cylinder from carburettor
Only air is introduced into the cylinder
None of these

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Automobile Engineering in ME
It is necessary to maintain the valve clearances as they

Allow for lengthening of the valves owing to the heat of combustion
Make the crankshaft turn smoothly
Increase the speed at which the valves move up and down
Reduce the resistance to sliding that occurs between the cam and the tappet

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