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Heat Transfer

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

Salty
Highly viscous
Scaling
Corrosive

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Heat Transfer
Choose the correct equation.

Nu = (Pr)(St)
Nu = (Re) (Pr) (Gz)
Nu = (Re) (Pr) (St)
Nu = (Re)(Pr)

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Heat Transfer
Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively)

E/C
CE
C/E
1/CE

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Heat Transfer
Thermal conductivity of a conducting solid material depends upon its

None of the listed here
both temperature & porosity
porosity
temperature

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Heat Transfer
The thickness of condensate layer in filmwise condensation depends on the

Surface configuration
All of these
Liquid flow rate from the surface
Condensation rate

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Heat Transfer
Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube

Exit-fluid temperature > wall temperature
Graetz number > 100
Exit fluid temperature < wall temperature
Exit fluid temperature = wall temperature

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