Automobile Engineering in ME
The advantage of the fuel injection system over the carburettor system is

Improved emission
Improved power output
All of the listed here
Improved fuel efficiency

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

Reduce the resistance to sliding that occurs between the cam and the tappet
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

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Automobile Engineering in ME
The crankcase dilution means

Dilution of lubrication oil by fuel in the crankcase D. Dilution
Dilution of mixture passing through crankcase in two stroke engines
Dilution of fuel in the crankcase
Dilution of oil by water in the crankcase

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