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Heat Transfer

Heat Transfer
What is the steam economy in case of a single effect evaporator system?

0.1
1
< 1
>1

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Heat Transfer
The equation, (NSt x N2/3Pr) = f/2, is the __________ analogy.

Reynolds
Prandtl
Colburn
None of these

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Heat Transfer
Prandtl number for most of dry gases is about

0.72
0.001
70
150

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Heat Transfer
Heat transfer rate described by Fourier's law will decrease, if the __________ increases.

Thickness
Temperature difference
Thermal conductivity
Heat transfer area

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Heat Transfer
In a heat exchanger, floating head is provided to

facilitate cleaning of the exchanger
relieve stresses caused by thermal expansion
increase the heat transfer area
increase log mean temperature gradient

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

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