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Heat Transfer

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

Highly viscous
Scaling
Salty
Corrosive

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

Prandtl
None of these
Colburn
Reynolds

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Heat Transfer
For what value of Prandtl number, the Col-burn analogy is valid ?

0.06 to 120
1 to 103
l to 50
0.6 to 120

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Heat Transfer
Which of the following has the lowest overall heat transfer co-efficient?

Molten sodium
Dowtherm
Water
Air

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Heat Transfer
The equivalent diameter for pressure drop is __________ that for heat transfer

greater than
equal to
smaller than
None of the listed here

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Heat Transfer
Corrosiveness of steam condensate is due to the presence of

Neither A nor B
Both A & B
Dissolved O₂
CO₂

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