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HEAT TRANSFER

Heat Transfer
The overall resistance for heat transfer through a series of flat resistance, is the __________ of the resistances.

Sum
Average
Product
Geometric mean

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Heat Transfer
For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then

hf = hd
hf > hd
hf < hd
hf could be greater or smaller than hd

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Heat Transfer
A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m².K. The Biot number is

3.5
0.0035
5.6
0.025

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Heat Transfer
A 2-4 heat exchanger involves

Smaller pressure drop compared to 1-2 exchanger
Only parallel-flow of fluids
Only counter-flow of fluids
Both counter and parallel-flow of the fluids

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Heat Transfer
A BTU/hr.ft.2 °F is equal to

None of these
4.88 kcal/hr. m.2°C
1 kcal/hr. m²°C
1 kcal/hr. m².°K

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