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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?

< 0.5
0.5
> 0.6
< 0.1

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Heat Transfer
The interchange factor for radiation heat transfer from surface 'x' to surface 'y' in case of an infinite parallel planes with emis-sivities εx & εy is given by

(εx + εy)/(εx + εy - εx . εy)
Εx + εy
1/εx + 1/εy
Εx . εy

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Heat Transfer
Baffles are provided in heat exchangers to increase the

Heat transfer area
Heat transfer rate
Heat transfer co-efficient
Fouling factor

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Heat Transfer
Analogy between mass and heat transfer is not applicable in case of

Viscous heating or chemical reaction
Same velocity profile or equal eddy diffusivities
Thermal or pressure mass diffusion
Both B and C

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Heat Transfer
The equivalent diameter for pressure drop is __________ that for heat transfer

None of the listed here
greater than
equal to
smaller than

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Heat Transfer
In case of __________ boiling, the bubbles formed on a submerged hot surface get absorbed in the mass of the liquid.

Low pressure
Pool
None of these
Nucleate

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