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

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

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Automobile Engineering in ME
The condition that causes vapour locking in a brake system is

Keeping the vehicle without use for an extended period
Overcooling of the brakes during high speed driving
Overheating of the fluid due to frequent brake application
An excessively high engine speed on a downhill road

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