Automobile Engineering in ME
The function of a governor in automobiles is to

Maintain constant engine speed
Limit the vehicle speed
Maximise the fuel economy
Limit the power

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

Less compression ratio gives better performance
It makes petrol engines lighter
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

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