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Heat Transfer

Heat Transfer
Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)

0.4 D
0.5 D
0.2 D
0.3 D

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Heat Transfer
Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer.

no
the least
the largest
lower

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Heat Transfer
Reynold's analogy states that (where, St = Stanton number f = friction factor)

St = f/4
St = f/2
St = 4f
St = f1/2

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

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Heat Transfer
In a shell and tube heat exchanger, square pitch compared to triangular pitch

Can pack more surface area into a shell of given diameter
None of these
Gives a lower shell side pressure drop
Gives a higher shell side pressure drop

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Heat Transfer
Black liquor generated during paper manufacture is concentrated in a

multiple effect evaporator
single effect evaporator followed by a crystalliser
multiple effect evaporators followed by a crystalliser
single effect evaporator

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