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Heat Transfer

Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Corrosive
Scaling
Highly viscous
Salty

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Heat Transfer
Shell side pressure drop in a shell and tube heat exchanger does not depend upon the

Viscosity, density & mass velocity of shell side fluid
None of these
Tube diameter & pitch
Baffle spacing & shell diameter

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Heat Transfer
A 2-4 heat exchanger involves

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

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Heat Transfer
The critical radius of insulation for a spherical shell is (where, K = thermal conductivity of insulating material h0 = heat transfer coefficient at the outer surface)

h0/2K
h0/K
K/h0
2K/h0

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Heat Transfer
In a shell and tube heat exchanger, the shell side fluid velocity can not be changed by changing the

Tube pitch
No. of baffles
Tube diameter
Tube layout

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Heat Transfer
Double pipe heat exchangers are used

when heat transfer area required is very low
because it is less costly
because it occupies less floor area
when heat transfer area required is very high

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MORE MCQ ON Heat Transfer

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