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

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

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Automobile Engineering in ME
The compression ratio in petrol engine is kept less than in Diesel engine because

It is just customary to have less compression ratio in petrol engines
Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition
It makes petrol engines lighter
Less compression ratio gives better performance

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