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Heat Transfer

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

10
2
100
0.5

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Heat Transfer
In a shell and tube heat exchanger, floating head is used for

Low pressure drop
High heat transfer co-efficient
Large temperature differentials
Less corrosion of tubes

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Heat Transfer
Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.)

d2
√d
d
d1.5

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Heat Transfer
The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness)

∝ t
∝ √t
Independent of 't'
∝ 1/t

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Heat Transfer
In a forward feed multiple effect, the pressure build up will be

highest at the inlet of the last effect
least at the outlet of the last effect
least at the inlet of the first effect
highest at the outlet of the last effect

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Heat Transfer
The purpose of providing bleed points in the evaporator is to

Remove the product
Admit the feed
Facilitate removal of non-condensable gases
Create vacuum

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MORE MCQ ON Heat Transfer

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