Heat Transfer
Which of the following situations can be approximated to a steady state heat transfer system?

Boiling brine kept in open vessel when the bottom surface temperature of the vessel is maintained constant at 180°C
A red hot steel slab (having outside surface temperature as 1300°C) exposed to the atmosheric air at 35°C
10 kg of dry saturated steam at 8 kgf/cm² flowing through a short length of stainless steel pipe exposed to atmospheric air at 35°C
A sub-cooled refrigerant liquid at 8°C flowing at the rate of 6 Kg/minute through a copper pipe exposed to atmospheric air at 35°C

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Heat Transfer
A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case,

The cooling rate will be the same for the two spheres and hence the two spheres will have equal temperatures at any instant
Both B & C
Both the spheres will emit equal amount of radiation per unit time in the beginning
Both will absorb equal amount of radiation from the surrounding in the beginning

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