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Heat Transfer

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

Graetz
None of these
Stanton
Peclet

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Heat Transfer
Nucleate boiling is promoted

In the absence of agitation
None of these
On rough surfaces
On polished surfaces

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Heat Transfer
Evaporation by thermocompression results in the

Both A and B
Realisation of multiple effect economy in a single effect
None of these
Saving of steam

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

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

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Heat Transfer
A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m².K. The Biot number is

5.6
3.5
0.0035
0.025

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Heat Transfer
The range of electromagnetic spectrum important in heat transfer by radiation is __________ microns.

5-50
100-1000
0.5-50
0.38-0.78

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