Automobile Engineering in ME
The heat transfer from coolant to air in the radiator of an automobile engine takes place by

Convention only
Conduction, convection and radiation
Convection and radiation
Radiation only

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

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
It is just customary to have less compression ratio in petrol engines

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