Film condensation is promoted on a/an _______________________ surface?

A. Oily
B. Coated
C. Clean & smooth
D. Dirty

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

A. A red hot steel slab (having outside surface temperature as 1300°C) exposed to the
atmospheric air at 35°C
B. 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
C. Boiling brine kept in open vessel when the bottom surface temperature of the vessel is