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Heat Transfer

Heat Transfer
Peclet number (Pe) is given by

Pe = Re/Pr
Pe = Pr/Re
Pe = Re.Pr
Pe = Nu.Re

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Heat Transfer
In SI units, fouling factor is expressed in

W/m²°K
m°K/W
m²°K
m²°K/W

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Heat Transfer
In forced convection, the Nusselt number is a function of

Re and Pr
Re and Sc
Re and Gr
Pr and Gr

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Heat Transfer
Thermal conductivity of a gas at low density, __________ with increase in temperature.

Decreases
Remains unchanged
Increases
May increase or decrease; depends on the gas

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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

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

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Heat Transfer
In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface.

Pool
Nucleate
Saturated
Local

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