Automobile Engineering in ME
The purpose of a thermostat in an engine cooling system is to

Indicate the coolant temperature
Prevent the coolant from boiling
Pressurise the system to raise the boiling point
Allow the engine to warm up quickly

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

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

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