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Heat Transfer

Heat Transfer
At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe?

< 0.1
< 0.5
0.5
> 0.6

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Heat Transfer
Dropwise condensation is promoted on a/an __________ surface.

Coated
Glazed
Oily
Smooth

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Heat Transfer
Choose the most important factor on which the heat conducted through a wall in a unit time will depend on?

Thickness of the wall
Temperature difference between the two surfaces of the wall
Area of the wall perpendicular to heat flow
Material of the wall

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Heat Transfer
The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is

Schmidt number
Sherwood number
Stanton number
Nusselt number

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Heat Transfer
Boiling point of a solution according to Duhring's rule is a linear function of the __________ of water.

Thermal conductivity
Boiling point (at the same pressure)
Viscosity
Density

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Heat Transfer
In SI units, fouling factor is expressed in

W/m²°K
m°K/W
m²°K/W
m²°K

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