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
It is necessary to maintain the valve clearances as they

Increase the speed at which the valves move up and down
Make the crankshaft turn smoothly
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

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Automobile Engineering in ME
A basic difference between the spark ignition engine and the Diesel engine is that the

Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke
All of these
Air temperature ignites the fuel in the Diesel engine
Diesel engine compresses air alone instead of an air-fuel mixture

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Automobile Engineering in ME
The rigid suspension is beneficial when

It is desired to reduce the unsprung mass
It is desired to improve tyre to ground contact characteristics
Large changes in load make it necessary to have a large suspension stroke
It is desired to have more flexibility in design

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