Heat Transfer
One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to

Heat the water from 0°C to 100°C
To superheat the steam
Data insufficient, can
Evaporate the water

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Heat Transfer
In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred

By heating an intermediate material (like chequor bricks) and then heating the air from this hot material
By direct contact of hot flue gas with air
Through a metallic wall
None of these

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