Heat Transfer
In pipe flow, heat is transferred from hot wall to the liquid by

Free and forced convection
Conduction only
Forced convection and conduction
Forced convection only

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Heat Transfer
In sub-cooled boiling,

Very large vapour space is necessary
Bubbles from heating surface are absorbed by the mass of the liquid
Temperature of the heating surface is less than the boiling point of the liquid
Temperature of the heating surface is more than the boiling point of the liquid

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