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Heat Transfer

Heat Transfer
Choose the correct equation.

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

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Heat Transfer
Nusselt number is a function of Prandtl number and __________ number of fluid in natural convection heat transfer.

Biot
Grashoff
Reynolds
Stantan

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Heat Transfer
Heat transfer by __________ may not necessarily require the presence of a medium

none of the listed here
radiation
coduction
natural convection

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Heat Transfer
To reduce the tube side pressure drop for the same flow rate, the heat exchanger recomended is

3-2 heat exchanger
1-2 heat exchanger
2-4 heat exchanger
1-1 heat exchanger

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Heat Transfer
The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the

Solution has an elevation of boiling point
Evaporators opreate at atmospheric pressure
Evaporators operate under vacuum
None of these

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Heat Transfer
Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is

Both B and C
Thin walled having the value of Ao Ai/< 2
Thick walled
Having the value of Ao/Ai > 2

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