Heat Transfer
For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it

Decreases the pressure drop
Increases the overall heat transfer coefficient
Decreases the outlet temperature of cooling medium
None of these

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Heat Transfer
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the

Temperature of the fin end
Average temperature of the fin
Constant temperature equal to that of the base
Surrounding temperature

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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
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
A red hot steel slab (having outside surface temperature as 1300°C) exposed to the atmosheric air at 35°C

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