Heat Transfer
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is

4.36
120.36
2.36
Dependent on NRe only

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Heat Transfer
In a heat exchanger, one transfer unit means

Both A and B
The size of the exchanger in which heat transfer rate is 1 kcal/hr
None of these
A section of the exchanger in which change in temperature of one stream equals the average driving force in the section

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