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Heat Transfer

Heat Transfer
For a multipass shell and tube heat exchanger, the LMTD correction factor is always

Between 1 & 2
< 1
1
> 1

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

Corrosive
Scaling
Salty
Highly viscous

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Heat Transfer
Economy of a multiple effect evaporator is not influenced much by the

boiling point elevations
rate of heat transfer
temperature of the feed
ratio of the weight of the thin liquor to thick liquor

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

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Heat Transfer
Which area is used in case of heat flow by conduction through a cylinder ?

Logarithmic mean area
None of the listed here
Geometric mean area
Arithmetic mean area

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Heat Transfer
Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is

None of these
Mainly confined to a thin film of fluid near the surface
Uniformly distributed throughout the fluid
In the central core of the fluid

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