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Heat Transfer

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

dirty
oily
clean & smooth
coated

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Heat Transfer
(NRe.NPr)(D/L) is called the __________ number

None of these
Peclet
Graetz
Stanton

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Heat Transfer
The thermal boundary layer at NPr > 1

Is thinner than hydrodynamic boundary layer
Disappears
And the hydrodynamic boundary layer are identical
Is thicker than hydrodynamic boundary layer

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Heat Transfer
Steady state one dimensional heat flow by conduction as given by Fourier's low does not assume that

Boundary surfaces are isothermal
There is no internal heat generation
Material is anisotropic
Constant temperature gradient exists

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Heat Transfer
Economy of a multiple effect evaporator depends upon the

Both A and B
Rate of heat transfer
Heat balance consideration
Neither A nor B

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Heat Transfer
jH factor for heat transfer is not a function of the __________ number.

Both B & C
Nusselt
Reynolds
Grashoff

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