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Heat Transfer

Heat Transfer
The unit of conductance in SI unit is

W/m°K
W/m²
W/m
W/°K

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Heat Transfer
Solid angle subtended by the finite surface at the radiating element is

called the view factor.
proportional to the square of the distance between surfaces
expressed in terms of radians
called the angle of vision

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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
_______ paint has the maximum absorption coefficient.

White
Grey
Yellow
Black

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Heat Transfer
Multiple effect evaporators are commonly used in the manufacture of P. Paper Q. Superphosphate R. Sugar S. Fats

P and R
P and S
R and S
P and Q

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Heat Transfer
Value of Nusselt number [Nu = (hD/k)] for the heat transfer by conduction from a droplet or a spherical particle to a surrounding stagnant film is

100
2
0.5
10

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