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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?

> 0.6
< 0.5
< 0.1
0.5

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Heat Transfer
Fourier's law applies to the heat transfer by

None of the listed here
convection
conduction
radiation

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Heat Transfer
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is

3.66
Dependent on NRe only
88.66
1.66

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

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

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Heat Transfer
Boiling point elevation of a solution of NaOH

Is almost independent of temperature
Is almost independent of pressure
Increases rapidly with temperature rise
Both B and C

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Heat Transfer
Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer.

no
lower
the least
the largest

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