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Heat Transfer

Heat Transfer
The equation, (NSt x N2/3Pr) = f/2, is the __________ analogy.

Reynolds
Colburn
Prandtl
None of these

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Heat Transfer
__________ heat exchanger is used for chilling oil to be dewaxed.

Floating head
Fixed tube
U-tube
Double pipe

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Heat Transfer
Convective heat transfer, in which heat is transferred by movement of warmed matter is described by

Fourier's law
None of these
Newton's law of cooling
Fick's law

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Heat Transfer
Peclet number (Pe) is given by

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

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Heat Transfer
With the increase of temperature, the Col-burn jH factor

Remains unchanged
Decreases
Increases
May increase or decrease ; depending on temperature

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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
Having the value of Ao/Ai > 2
Thin walled having the value of Ao Ai/< 2
Thick walled

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